{"id":38289,"date":"2024-01-11T02:50:37","date_gmt":"2023-11-26T07:11:53","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react%e9%87%8d%e6%96%b0%e6%b8%b2%e6%9f%93%e6%8c%87%e5%8d%97%ef%bc%9a%e4%b8%80%e6%ac%a1%e6%80%a7%e5%ae%8c%e5%85%a8%e7%90%86%e8%a7%a3\/"},"modified":"2024-05-04T17:49:14","modified_gmt":"2024-05-04T09:49:14","slug":"react%e9%87%8d%e6%96%b0%e6%b8%b2%e6%9f%93%e6%8c%87%e5%8d%97%ef%bc%9a%e4%b8%80%e6%ac%a1%e6%80%a7%e5%ae%8c%e5%85%a8%e7%90%86%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react%e9%87%8d%e6%96%b0%e6%b8%b2%e6%9f%93%e6%8c%87%e5%8d%97%ef%bc%9a%e4%b8%80%e6%ac%a1%e6%80%a7%e5%ae%8c%e5%85%a8%e7%90%86%e8%a7%a3\/","title":{"rendered":"React\u91cd\u65b0\u6e32\u67d3\u6307\u5357\uff1a\u4e00\u6b21\u6027\u5b8c\u5168\u7406\u89e3"},"content":{"rendered":"<p>\u8fd9\u7bc7\u6587\u7ae0\u662f\u300aReact\u91cd\u6e32\u67d3\u6307\u5357\uff1a\u4e00\u5207\u90fd\u4e00\u6b21\u6027\u5904\u7406\u300b\u7684\u7ffb\u8bd1\u6587\u7ae0\u3002<br \/>\n\u6211\u5df2\u7ecf\u5f97\u5230\u4e86\u672c\u4eba\uff08Nadia Makarevich\u5973\u58eb\uff09\u7684\u8bb8\u53ef\u6765\u7ffb\u8bd1\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d337337434c4406c6569b\/1-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2023-09-28 21.59.08.png\" \/><\/div>\n<p>\u4ee5\u4e0b\u662f\u7ffb\u8bd1\u6587\u7ae0\u3002<\/p>\n<h1>React\u518d\u6e32\u67d3\u6307\u5357\uff1a\u4e00\u6b21\u5168\u9762\u7406\u89e3<\/h1>\n<p>\u8fd9\u662f\u4e00\u4efd\u8be6\u7ec6\u4ecb\u7ecdReact\u91cd\u65b0\u6e32\u67d3\u7684\u6307\u5357\u3002<br \/>\n\u5728\u8fd9\u4e2a\u6307\u5357\u4e2d\uff0c\u4f1a\u89e3\u91ca\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3068\u306f\u4f55\u304b\uff1f<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5fc5\u8981\u306a\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3068\u4e0d\u8981\u306a\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3068\u306f\u4f55\u304b\uff1f<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u4f55\u304cReact\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u306e\u304b\uff1f<\/ul>\n<p>\u53e6\u5916\uff0c\u8fd8\u5305\u62ec\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u9632\u3050\u305f\u3081\u306e\u6700\u3082\u91cd\u8981\u306a\u30d1\u30bf\u30fc\u30f3<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u4e0d\u8981\u306a\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3068\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b\u306b\u3064\u306a\u304c\u308b\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/ul>\n<p>\u6240\u6709\u7684\u6a21\u5f0f\u548c\u53cd\u6a21\u5f0f\u90fd\u9644\u6709\u56fe\u793a\u548c\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<p>\u8be5\u6587\u7ae0\u7684\u4e00\u4e9b\u7ae0\u8282\u4e5f\u53ef\u4ee5\u901a\u8fc7\u89c6\u9891\u89c2\u770b\u3002<br \/>\nhttps:\/\/www.youtube.com\/channel\/UCxz8PLj1ld6y-zpJmpqpOrw<\/p>\n<h2>\u76ee\u5f55<\/h2>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4ec0\u4e48\u662fReact\u7684\u91cd\u65b0\u6e32\u67d3\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>React\u7ec4\u4ef6\u4f1a\u5728\u4ec0\u4e48\u65f6\u5019\u91cd\u65b0\u6e32\u67d3\uff1f<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f7f\u7528\u7ec4\u5408\u6765\u9632\u6b62\u91cd\u65b0\u6e32\u67d3<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f7f\u7528React.memo\u6765\u9632\u6b62\u91cd\u65b0\u6e32\u67d3<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f7f\u7528useMemo\/useCallback\u6765\u63d0\u9ad8\u91cd\u65b0\u6e32\u67d3\u6027\u80fd<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u63d0\u9ad8\u5217\u8868\u7684\u91cd\u65b0\u6e32\u67d3\u6027\u80fd<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u4f7f\u7528Context\u6765\u9632\u6b62\u5f15\u8d77\u7684\u91cd\u65b0\u6e32\u67d3<\/ol>\n<h2>1. \u91cd\u65b0\u6e32\u67d3\u662f\u6307\u4ec0\u4e48\uff1f<\/h2>\n<p>\u8fd9\u4e00\u7ae0\u8282\u4e5f\u53ef\u4ee5\u901a\u8fc7\u89c6\u9891\u89c2\u770b\u3002<br \/>\n<iframe loading=\"lazy\" title=\"Why React components re-render?\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/ARWX1XdghLk?start=39&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>\u5f53\u8c08\u8bbaReact\u7684\u6027\u80fd\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4e24\u4e2a\u9636\u6bb5\u3002<\/p>\n<p>\u521d\u671f\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 &#8211; \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u6700\u521d\u306b\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u308b\u3068\u304d\u306b\u767a\u751f\u3059\u308b\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u3053\u3068<\/p>\n<p>\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 &#8211; \u3059\u3067\u306b\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u767a\u751f\u3059\u308b2\u56de\u76ee\u4ee5\u964d\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u3053\u3068<\/p>\n<p>\u5f53React\u4f7f\u7528\u65b0\u6570\u636e\u66f4\u65b0\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u4f1a\u53d1\u751f\u91cd\u65b0\u6e32\u67d3\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u91cd\u65b0\u6e32\u67d3\u662f\u7531\u7528\u6237\u64cd\u4f5c\u5e94\u7528\u7a0b\u5e8f\uff0c\u6216\u8005\u901a\u8fc7\u5f02\u6b65\u8bf7\u6c42\u6216\u8ba2\u9605\u6a21\u5f0f\u64cd\u4f5c\u83b7\u53d6\u7684\u5916\u90e8\u6570\u636e\u6240\u5f15\u8d77\u7684\u3002<\/p>\n<p>\u5728\u4e0d\u5b58\u5728\u975e\u540c\u6b65\u6570\u636e\u66f4\u65b0\u7684\u975e\u4ea4\u4e92\u5f0f\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u91cd\u65b0\u6e32\u67d3\u7edd\u5bf9\u4e0d\u4f1a\u53d1\u751f\u3002\u56e0\u6b64\uff0c\u4e0d\u9700\u8981\u8003\u8651\u5bf9\u8fd9\u7c7b\u5e94\u7528\u7a0b\u5e8f\u8fdb\u884c\u91cd\u65b0\u6e32\u67d3\u7684\u6027\u80fd\u4f18\u5316\u3002<\/p>\n<h3>? \u4ec0\u4e48\u662f\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u548c\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\uff1f<\/h3>\n<p>\u5fc5\u8981\u306a\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u662f\u6307\u539f\u59cb\u7ec4\u4ef6\u6216\u76f4\u63a5\u4f7f\u7528\u65b0\u4fe1\u606f\u7684\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002\u4f8b\u5982\uff0c\u5982\u679c\u7528\u6237\u5728\u8f93\u5165\u8868\u5355\u4e2d\u8f93\u5165\u4e86\u4efb\u4f55\u5185\u5bb9\uff0c\u7ba1\u7406\u8be5\u72b6\u6001\u7684\u7ec4\u4ef6\u9700\u8981\u5728\u7528\u6237\u6309\u4e0b\u6309\u952e\u65f6\u8fdb\u884c\u81ea\u6211\u66f4\u65b0\u3002\u8fd9\u5c31\u662f\u6240\u9700\u7684\u518d\u6e32\u67d3\u3002<\/p>\n<p>\u8fd9\u662f\u7531\u4e8e\u9519\u8bef\u4e14\u4f4e\u6548\u7684\u5e94\u7528\u7a0b\u5e8f\u8bbe\u8ba1\u5bfc\u81f4\u7684\u5404\u79cd\u4e0d\u5fc5\u8981\u7684\u518d\u6e32\u67d3\u5728\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4f20\u64ad\u7684\u518d\u6e32\u67d3\u3002\u4f8b\u5982\uff0c\u5f53\u7528\u6237\u5728\u8f93\u5165\u5b57\u6bb5\u4e2d\u8f93\u5165\u5185\u5bb9\u5e76\u6309\u4e0b\u952e\u76d8\u65f6\uff0c\u6574\u4e2a\u9875\u9762\u90fd\u4f1a\u91cd\u65b0\u6e32\u67d3\uff0c\u8fd9\u6837\u9875\u9762\u5c31\u4f1a\u88ab\u4e0d\u5fc5\u8981\u5730\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u4e0d\u9700\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u672c\u8eab\u5e76\u4e0d\u662f\u4e00\u4e2a\u95ee\u9898\u3002\u7531\u4e8eReact\u975e\u5e38\u5feb\u901f\uff0c\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u7528\u6237\u4e0d\u4f1a\u6ce8\u610f\u5230\u5b83\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5982\u679c\u91cd\u65b0\u6e32\u67d3\u53d1\u751f\u8fc7\u591a\u6216\u5728\u975e\u5e38\u91cd\u7684\u7ec4\u4ef6\u4e0a\u6267\u884c\uff0c\u7528\u6237\u4f53\u9a8c\u53ef\u80fd\u4f1a\u51fa\u73b0&#8221;\u5361\u987f&#8221;\u6216&#8221;\u5ef6\u8fdf&#8221;\u7684\u73b0\u8c61\uff0c\u6bcf\u6b21\u64cd\u4f5c\u90fd\u4f1a\u660e\u663e\u5ef6\u8fdf\uff0c\u751a\u81f3\u53ef\u80fd\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u5b8c\u5168\u65e0\u54cd\u5e94\u3002<\/p>\n<h2>2. React\u7ec4\u4ef6\u4f55\u65f6\u91cd\u65b0\u6e32\u67d3\uff1f<\/h2>\n<p>\u8fd9\u4e00\u7bc7\u7ae0\u7684\u5185\u5bb9\u53ef\u4ee5\u901a\u8fc7\u89c6\u9891\u8fdb\u884c\u89c2\u770b\u3002<br \/>\n<iframe loading=\"lazy\" title=\"Why React components re-render?\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/ARWX1XdghLk?start=244&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u7684\u539f\u56e0\u6709\u56db\u4e2a\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u72b6\u6001\u53d8\u66f4<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7236\u7ec4\u4ef6\uff08\u6216\u5b50\u7ec4\u4ef6\uff09\u91cd\u65b0\u6e32\u67d3<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4e0a\u4e0b\u6587\u53d8\u66f4<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>React hooks\u7684\u4fee\u6539<\/ol>\n<p>\u53e6\u5916\uff0c\u5173\u4e8e\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u7684\u539f\u56e0\uff0c\u4e5f\u5b58\u5728\u4e00\u4e9b\u8bef\u89e3\u3002<\/p>\n<ul class=\"post-ul\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e props \u304c\u5909\u66f4\u3055\u308c\u308b\u3068\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u767a\u751f\u3059\u308b<\/ul>\n<p>\u8fd9\u5c31\u662f\u4e8b\u5b9e\u3002\u8fd9\u5e76\u4e0d\u662f\u4e8b\u5b9e(\u53c2\u8003\u4ee5\u4e0b\u8bf4\u660e)\u3002<\/p>\n<h3>? \u518d\u6e32\u67d3\u7684\u539f\u56e0\u662f\u72b6\u6001\u7684\u6539\u53d8<\/h3>\n<p>\u5f53\u7ec4\u4ef6\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u8be5\u7ec4\u4ef6\u5c06\u91cd\u65b0\u6e32\u67d3\u3002<br \/>\n\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4f1a\u5728\u56de\u8c03\u51fd\u6570\u6216 useEffect \u94a9\u5b50\u4e2d\u53d1\u751f\u3002<\/p>\n<p>\u72b6\u6001\u7684\u6539\u53d8\u662f\u6240\u6709\u91cd\u65b0\u6e32\u67d3\u7684\u201c\u6839\u6e90\u201d\u539f\u56e0\u3002<\/p>\n<p>\u8bf7\u53c2\u8003CodeSandbox\u7684\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setState<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 1. \u72b6\u614b\u306e\u5909\u66f4<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">...<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>? \u91cd\u65b0\u6e32\u67d3\u7684\u539f\u56e0\uff1a\u7236\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3<\/h3>\n<p>\u5f53\u7ec4\u4ef6\u7684\u7236\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u8be5\u7ec4\u4ef6\u672c\u8eab\u4e5f\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5f53\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u8be5\u7ec4\u4ef6\u7684\u6240\u6709\u5b50\u7ec4\u4ef6\u4e5f\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u603b\u662f\u5411\u4e0b\u65b9\u5411\u904d\u5386\u7ec4\u4ef6\u6811\u3002<br \/>\n\u4e5f\u5c31\u662f\u8bf4\uff0c\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u4e0d\u4f1a\u89e6\u53d1\u7236\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002(\u4f46\u6709\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\u548c\u7279\u6b8a\u60c5\u51b5\uff0c\u8be6\u7ec6\u4fe1\u606f\u8bf7\u53c2\u8003\u4e0b\u4e00\u7bc7\u6307\u5357:\u300aReact \u5143\u7d20\u3001\u5b50\u7ec4\u4ef6\u3001\u7236\u7ec4\u4ef6\u548c\u91cd\u65b0\u6e32\u67d3\u7684\u5965\u79d8\u300b)\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 codesandbox \u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"c1\">\/\/ 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>? \u518d\u6e32\u67d3\u7684\u539f\u56e0\uff1a\u4e0a\u4e0b\u6587\u7684\u53d8\u66f4<\/h3>\n<p>\u5f53Context API\u7684Context Provider\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u4f7f\u7528\u8be5Context\u7684\u6240\u6709\u7ec4\u4ef6\u90fd\u4f1a\u91cd\u65b0\u6e32\u67d3\uff0c\u5373\u4f7f\u5b83\u4eec\u5e76\u6ca1\u6709\u76f4\u63a5\u4f7f\u7528\u53d8\u5316\u7684\u6570\u636e\u90e8\u5206\u3002\u867d\u7136\u4e0d\u80fd\u901a\u8fc7\u8bb0\u5fc6\u5316\u6765\u963b\u6b62\u8fd9\u4e9b\u91cd\u65b0\u6e32\u67d3\uff0c\u4f46\u53ef\u4ee5\u91c7\u7528\u4e00\u4e9b\u8fd1\u4f3c\u7684\u65b9\u6cd5\u6765\u907f\u514d\uff08\u53c2\u89c1Part 7: preventing re-renders caused by Context\uff09\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">useValue<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">Context<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ 1. Context \u306e\u5024\u306e\u5909\u66f4<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component1<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useValue<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">...<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component2<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useValue<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">...<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>? \u91cd\u65b0\u6e32\u67d3\u7684\u8d77\u56e0\uff1aReact hooks \u7684\u6539\u53d8<\/h3>\n<p>\u5728 Hook \u5185\u53d1\u751f\u7684\u4e00\u5207\u90fd &#8220;\u5c5e\u4e8e&#8221; \u4f7f\u7528\u5b83\u7684\u7ec4\u4ef6\u3002<br \/>\n\u5728\u8fd9\u91cc\u4e5f\u9002\u7528\u4e8e &#8220;\u4e0a\u4e0b\u6587\u66f4\u6539&#8221; \u548c &#8220;\u72b6\u6001\u66f4\u6539&#8221; \u7684\u89c4\u5219\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30d5\u30c3\u30af\u5185\u306e\u72b6\u614b\u306e\u5909\u66f4\u306f\u3001&#8221;\u30db\u30b9\u30c8&#8221;\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff08\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3057\u307e\u3059\u3002\u3053\u308c\u306f \u9632\u304e\u3088\u3046\u304c\u3042\u308a\u307e\u305b\u3093 \u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30d5\u30c3\u30af\u304c Context \u3092\u4f7f\u7528\u3057\u3001Context \u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u308b\u3068\u3001&#8221;\u30db\u30b9\u30c8&#8221;\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3057\u307e\u3059\u3002\u3053\u308c\u306f \u9632\u304e\u3088\u3046\u304c\u3042\u308a\u307e\u305b\u3093 \u3002<\/ul>\n<p>\u94a9\u5b50\u53ef\u4ee5\u94fe\u63a5\uff08\u5728\u4e00\u4e2a\u94a9\u5b50\u5185\u4f7f\u7528\u53e6\u4e00\u4e2a\u94a9\u5b50\uff09\u3002\u5373\u4f7f\u88ab\u94fe\u63a5\uff0c\u6bcf\u4e2a\u94a9\u5b50\u90fd\u201c\u5c5e\u4e8e\u201d\u4e3b\u673a\u7ec4\u4ef6\uff0c\u5e76\u4e14\u540c\u6837\u7684\u89c4\u5219\u9002\u7528\u4e8e\u6240\u6709\u7684\u94a9\u5b50\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 Codesandbox \u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">useSomething<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">Context<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ 1. Context \u306e\u5024\u306e\u5909\u66f4<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">useValue<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nf\">useSomething<\/span><span class=\"p\">()<\/span> <span class=\"c1\">\/\/ 2. \u30c1\u30a7\u30fc\u30f3\u304c\u53cd\u5fdc<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 3. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useValue<\/span><span class=\"p\">();<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">...<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u518d\u6e32\u67d3\u7684\u539f\u56e0\uff1a\u66f4\u6539\u4e86props\uff08\u72af\u4e86\u4e00\u4e2a\u5927\u9519\u8bef\uff09\u3002<\/h3>\n<p>\u4e0d\u8bba\u7ec4\u4ef6\u7684 props \u662f\u5426\u88ab\u6539\u53d8\uff0c\u5bf9\u4e8e\u672a\u88ab\u5b58\u50a8\u7684\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u5e76\u4e0d\u76f8\u5173\u3002<\/p>\n<p>\u8981\u66f4\u6539 props \u7684\u8bdd\uff0c\u5fc5\u987b\u901a\u8fc7\u7236\u7ec4\u4ef6\u8fdb\u884c\u66f4\u65b0\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5fc5\u987b\u91cd\u65b0\u6e32\u67d3\u7236\u7ec4\u4ef6\u3002\u8fd9\u5c06\u89e6\u53d1\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002\u4e0e props \u65e0\u5173\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 codesandbox \u7684\u793a\u4f8b<\/p>\n<p>\u53ea\u6709\u5728\u4f7f\u7528\u8bb0\u5fc6\u6280\u672f\uff08React.memo\u3001useMemo\uff09\u65f6\uff0cprops\u7684\u66f4\u6539\u624d\u53d8\u5f97\u91cd\u8981\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">{<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"c1\">\/\/ 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\uff08props \u306e `value` \u306f\u95a2\u4fc2\u306a\u3057\uff09<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h2>\u4f7f\u7528\u7ec4\u5408\u6765\u9632\u6b62\u518d\u6e32\u67d3\u3002<\/h2>\n<p>\u8fd9\u4e00\u7ae0\u4e5f\u53ef\u4ee5\u5728\u89c6\u9891\u4e2d\u89c2\u770b\u3002<br \/>\n<iframe loading=\"lazy\" title=\"Preventing React re-renders with composition\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/7sgBhmLjVws?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3>\u53cd\u6a21\u5f0f\uff1a\u5728render\u51fd\u6570\u4e2d\u521b\u5efa\u7ec4\u4ef6<\/h3>\n<p>\u5728\u53e6\u4e00\u4e2a\u7ec4\u4ef6\u7684\u6e32\u67d3\u51fd\u6570\u5185\u521b\u5efa\u4e00\u4e2a\u7ec4\u4ef6\u662f\u4e00\u4e2a\u5bfc\u81f4\u6027\u80fd\u4e25\u91cd\u4e0b\u964d\u7684\u53cd\u6a21\u5f0f\u3002<br \/>\n\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\uff0cReact\u4f1a\u91cd\u65b0\u6302\u8f7d\u8be5\u7ec4\u4ef6\uff08\u5373\u9500\u6bc1\u7ec4\u4ef6\u5e76\u91cd\u65b0\u521b\u5efa\uff09\u3002\u8fd9\u6bd4\u666e\u901a\u7684\u91cd\u65b0\u6e32\u67d3\u8981\u6162\u5f97\u591a\u3002\u6b64\u5916\uff0c\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4ee5\u4e0b\u7c7b\u578b\u7684\u9519\u8bef\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u4e2d\u306b\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u300c\u30d5\u30e9\u30c3\u30b7\u30e5\u3059\u308b\u300d\u53ef\u80fd\u6027\u304c\u3042\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u305f\u3073\u306b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u306e\u72b6\u614b\u304c\u30ea\u30bb\u30c3\u30c8\u3055\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u4f9d\u5b58\u95a2\u4fc2\u306e\u306a\u3044 useEffect \u304c\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u305f\u3073\u306b\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30d5\u30a9\u30fc\u30ab\u30b9\u3055\u308c\u3066\u3044\u305f\u5834\u5408\u3001\u30d5\u30a9\u30fc\u30ab\u30b9\u304c\u5931\u308f\u308c\u308b<\/ul>\n<p>\u8bf7\u53c2\u8003 Codesandbox \u4e0a\u7684\u793a\u4f8b<\/p>\n<p>\u5982\u4f55\u7f16\u5199\u9ad8\u6027\u80fd\u7684React\u4ee3\u7801: \u89c4\u5219\u3001\u6a21\u5f0f\u3001\u8981\u505a\u548c\u4e0d\u8981\u505a\u7684\u4e8b\u9879<\/p>\n<p>\u4e0d\u597d\u7684<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">SlowComponent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span> <span class=\"p\">\/&gt;;<\/span> <span class=\"c1\">\/\/ 2. \u518d\u4f5c\u6210\u3055\u308c\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"c1\">\/\/ 3. \u518d\u30de\u30a6\u30f3\u30c8\uff01\uff01<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u597d\u7684<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">SlowComponent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span> <span class=\"p\">\/&gt;;<\/span> <span class=\"c1\">\/\/ 2. \uff08\u518d\u30de\u30a6\u30f3\u30c8\u3055\u308c\u306a\u3044\uff09\u540c\u3058\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u307e\u307e<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"c1\">\/\/ 3. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u3060\u3051<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u2705 \u4f7f\u7528\u7ec4\u5408\u6765\u9632\u6b62\u91cd\u6e32\u67d3\uff1a\u5c06\u72b6\u6001\u79fb\u5230\u4e0b\u5c42\uff08\u5b50\u7ec4\u4ef6\uff09\u3002<\/h3>\n<p>\u8fd9\u4e00\u7ae0\u8282\u4e5f\u53ef\u4ee5\u5728\u89c6\u9891\u4e2d\u89c2\u770b\u3002<br \/>\n<iframe loading=\"lazy\" title=\"Preventing React re-renders with composition\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/7sgBhmLjVws?start=106&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>\u8fd9\u79cd\u6a21\u5f0f\u9002\u7528\u4e8e\u91cd\u578b\u7ec4\u4ef6\u7ba1\u7406\u72b6\u6001\uff0c\u800c\u4e14\u8be5\u72b6\u6001\u4ec5\u5728\u6e32\u67d3\u6811\u7684\u4e00\u90e8\u5206\u4e2d\u4f7f\u7528\u7684\u60c5\u51b5\u3002\u4e00\u4e2a\u5178\u578b\u7684\u4f8b\u5b50\u662f\uff0c\u5728\u6e32\u67d3\u9875\u9762\u7684\u590d\u6742\u7ec4\u4ef6\u4e2d\uff0c\u70b9\u51fb\u6309\u94ae\u6765\u6253\u5f00\u6216\u5173\u95ed\u5bf9\u8bdd\u6846\u3002<\/p>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u5c06\u6a21\u6001\u5bf9\u8bdd\u6846\u7684\u663e\u793a\u72b6\u6001\u3001\u5bf9\u8bdd\u6846\u672c\u8eab\u4ee5\u53ca\u89e6\u53d1\u66f4\u65b0\u7684\u6309\u94ae\u5c01\u88c5\u5230\u8f83\u5c0f\u7684\u7ec4\u4ef6\u4e2d\u3002\u901a\u8fc7\u8fd9\u6837\u505a\uff0c\u5373\u4f7f\u8fd9\u4e9b\u72b6\u6001\u53d1\u751f\u53d8\u5316\uff0c\u5927\u578b\u7ec4\u4ef6\u4e5f\u4e0d\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<p>React\u5143\u7d20\u7684\u5965\u79d8\uff1a\u5b50\u5143\u7d20\u3001\u7236\u5143\u7d20\u548c\u91cd\u65b0\u6e32\u67d3\u4e4b\u8c1c\uff0c\u7f16\u5199\u9ad8\u6027\u80fd\u7684React\u4ee3\u7801\uff1a\u89c4\u5219\u3001\u6a21\u5f0f\u3001\u8981\u505a\u7684\u548c\u4e0d\u8be5\u505a\u7684\u4e8b\u60c5\u3002<\/p>\n<p>\u7cdf\u7cd5<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">open<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setOpen<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">);<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setOpen<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">isOpen<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">ModalDialog<\/span> <span class=\"p\">\/&gt;<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">VerySlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">Something<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ButtonWithDialog<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">open<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setOpen<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">);<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setOpen<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">isOpen<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">ModalDialog<\/span> <span class=\"p\">\/&gt;<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">ButtonWithDialog<\/span> <span class=\"p\">\/&gt;<\/span> \r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">VerySlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u5f71\u97ff\u3092\u53d7\u3051\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">Something<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u901a\u8fc7\u4f7f\u7528\u7ec4\u5408\u9632\u6b62\u91cd\u65b0\u6e32\u67d3\uff1a\u5c06\u5176\u4f5c\u4e3a props \u4e2d\u7684 children\u3002<\/h3>\n<p>\u4f60\u53ef\u4ee5\u5728\u89c6\u9891\u4e2d\u89c2\u770b\u672c\u7ae0\u5185\u5bb9\u3002<br \/>\n<iframe loading=\"lazy\" title=\"Preventing React re-renders with composition\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/7sgBhmLjVws?start=272&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>\u8fd9\u4e2a\u6a21\u5f0f\u4e5f\u53ef\u4ee5\u88ab\u79f0\u4f5c\u201c\u5c06\u72b6\u6001\u5305\u88c5\u5728children\u5468\u56f4\u201d\u3002\u5b83\u7c7b\u4f3c\u4e8e\u201c\u5c06\u72b6\u6001\u4e0b\u79fb\u7ed9\u5b50\u7ec4\u4ef6\u201d\u7684\u6a21\u5f0f\uff0c\u53ef\u4ee5\u5c06\u72b6\u6001\u7684\u53d8\u5316\u5c01\u88c5\u5728\u66f4\u5c0f\u7684\u7ec4\u4ef6\u4e2d\u3002\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0c\u72b6\u6001\u88ab\u7528\u4e8e\u5305\u88c5\u6e32\u67d3\u6811\u4e2d\u7684\u6162\u901f\u5143\u7d20\uff0c\u6240\u4ee5\u63d0\u53d6\u5b83\u5e76\u4e0d\u90a3\u4e48\u5bb9\u6613\u3002\u4e00\u4e2a\u5178\u578b\u7684\u4f8b\u5b50\u662f\u5728\u7ec4\u4ef6\u7684\u6839\u5143\u7d20\u4e0a\u9644\u52a0\u7684onScroll\u6216onMouseMove\u56de\u8c03\u51fd\u6570\u3002<\/p>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u72b6\u6001\u7ba1\u7406\u548c\u4f7f\u7528\u8be5\u72b6\u6001\u7684\u7ec4\u4ef6\u63d0\u53d6\u4e3a\u8f83\u5c0f\u7684\u7ec4\u4ef6\uff0c\u5c06\u6162\u901f\u7ec4\u4ef6\u4f5c\u4e3a\u8be5\u7ec4\u4ef6\u7684\u5b50\u7ec4\u4ef6\u4f20\u9012\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002\u4ece\u8f83\u5c0f\u7684\u7ec4\u4ef6\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u5b50\u7ec4\u4ef6\u53ea\u662f\u7b80\u5355\u7684props\uff0c\u4e0d\u4f1a\u53d7\u5230\u72b6\u6001\u66f4\u6539\u7684\u5f71\u54cd\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u4e0d\u4f1a\u53d1\u751f\u91cd\u65b0\u6e32\u67d3\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u8bf7\u53c2\u8003CodeSandbox\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u8ffd\u52a0\u8d44\u6e90\uff1aReact\u5143\u7d20\u3001\u5b50\u5143\u7d20\u3001\u7236\u5143\u7d20\u548c\u91cd\u65b0\u6e32\u67d3\u7684\u8c1c\u56e2<\/p>\n<p>\u4e0d\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">({});<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span> <span class=\"na\">onScroll<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setValue<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b *\/<\/span> <span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">VerySlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d\u7684 de)<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ComponentWithScroll<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">({});<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span> <span class=\"na\">onScroll<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setValue<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b *\/<\/span> <span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u5358\u306a\u308b props \u306a\u306e\u3067\u3001\u5f71\u97ff\u3092\u53d7\u3051\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">ComponentWithScroll<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">VerySlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 3. \u5f71\u97ff\u3092\u53d7\u3051\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">ComponentWithScroll<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u2705 \u4f7f\u7528\u7ec4\u4ef6\u9632\u6b62\u91cd\u65b0\u6e32\u67d3: \u5c06\u5176\u4f5c\u4e3a\u5c5e\u6027\u4f20\u9012\u7ed9\u7ec4\u4ef6\u3002<\/h3>\n<p>\u8fd9\u4e00\u7ae0\u8282\u53ef\u5728\u89c6\u9891\u4e2d\u89c2\u770b\u3002<br \/>\n<iframe loading=\"lazy\" title=\"Preventing React re-renders with composition\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/7sgBhmLjVws?start=462&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>\u8fd9\u4e2a\u65b0\u6a21\u5f0f\u4e0e\u4e4b\u524d\u7684\u6a21\u5f0f\u51e0\u4e4e\u76f8\u540c\uff0c\u5176\u529f\u80fd\u4e5f\u76f8\u540c\u3002\u5b83\u5c06\u72b6\u6001\u5c01\u88c5\u5728\u5c0f\u7ec4\u4ef6\u5185\u90e8\uff0c\u5e76\u5c06\u91cd\u578b\u7ec4\u4ef6\u4f5c\u4e3a props \u4f20\u9012\u3002\u7531\u4e8e props \u4e0d\u4f1a\u53d7\u5230\u72b6\u6001\u53d8\u5316\u7684\u5f71\u54cd\uff0c\u56e0\u6b64\u91cd\u578b\u7ec4\u4ef6\u5c06\u4e0d\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u5f53\u4e00\u4e9b\u91cd\u8981\u7684\u7ec4\u4ef6\u4e0e\u72b6\u6001\u65e0\u5173\u65f6\uff0c\u5b83\u4eec\u65e0\u6cd5\u88ab\u89c6\u4e3a\u7c7b\u4f3c\u4e8echildren\u7684\u7fa4\u7ec4\uff0c\u8fd9\u65f6\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u6709\u5173\u5c06\u7ec4\u4ef6\u4f5c\u4e3a props \u4f20\u9012\u7684\u65b9\u6cd5\uff0c\u8bf7\u53c2\u9605\u4ee5\u4e0b\u8be6\u7ec6\u5185\u5bb9\uff1aReact \u7ec4\u4ef6\u4f5c\u4e3a prop \u7684\u6b63\u786e\u65b9\u6cd5\u2122\ufe0f\u3001React \u5143\u7d20\u3001\u5b50\u7ec4\u4ef6\u3001\u7236\u7ec4\u4ef6\u548c\u91cd\u65b0\u6e32\u67d3\u7684\u795e\u79d8\u4e4b\u5904\u3002<\/p>\n<p>\u7cdf\u7cd5<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">({});<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span> <span class=\"na\">onScroll<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setValue<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b *\/<\/span> <span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent1<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent2<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ComponentWithScroll<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">left<\/span><span class=\"p\">,<\/span> <span class=\"nx\">right<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">({});<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span> <span class=\"na\">onScroll<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setValue<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b *\/<\/span> <span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">left<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u5358\u306a\u308b props \u306a\u306e\u3067\u3001\u5f71\u97ff\u3092\u53d7\u3051\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span> <span class=\"p\">\/&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">right<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u5358\u306a\u308b props \u306a\u306e\u3067\u3001\u5f71\u97ff\u3092\u53d7\u3051\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">ComponentWithScroll<\/span><span class=\"p\">&gt;<\/span>\r\n      left=<span class=\"si\">{<\/span><span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent1<\/span> <span class=\"p\">\/&gt;<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u5f71\u97ff\u3092\u53d7\u3051\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n      right=<span class=\"si\">{<\/span><span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent2<\/span> <span class=\"p\">\/&gt;<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u5f71\u97ff\u3092\u53d7\u3051\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n    \/&gt;\r\n  );\r\n};\r\n<\/code><\/pre>\n<h2>\u7528 React.memo \u907f\u514d\u91cd\u65b0\u6e32\u67d3\u3002<\/h2>\n<p>\u8fd9\u4e00\u8282\u7684\u5185\u5bb9\u4f60\u4e5f\u53ef\u4ee5\u5728\u89c6\u9891\u4e2d\u89c2\u770b\u3002<br \/>\n<iframe loading=\"lazy\" title=\"Preventing re-renders with React.memo\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/feEY3Qajrwg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>\u5f53\u4f7f\u7528 React.memo \u6765\u5305\u88c5\u7ec4\u4ef6\u65f6\uff0c\u53ea\u8981\u8be5\u7ec4\u4ef6\u7684 props \u6ca1\u6709\u6539\u53d8\uff0c\u5c31\u53ef\u4ee5\u5728\u6e32\u67d3\u6811\u7684\u4e0a\u5c42\u963b\u6b62\u4e0b\u6e38\u89e6\u53d1\u7684\u91cd\u65b0\u6e32\u67d3\u94fe\u3002<\/p>\n<p>\u5f53\u6e32\u67d3\u91cd\u578b\u7ec4\u4ef6\u65f6\uff0c\u5b83\u5bf9\u4e8e\u6e90\uff08\u5373\u72b6\u6001\u6216\u5df2\u66f4\u6539\u7684\u6570\u636e\uff09\u7684\u518d\u6e32\u67d3\u662f\u4e0d\u4f9d\u8d56\u7684\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u7684\u793a\u4f8b\u3002<\/p>\n<p>\u4e0d\u597d (b\u00f9<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Child<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildMemo<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"c1\">\/\/ 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u2705 React.memo\uff1a\u5177\u6709 props \u7684\u7ec4\u4ef6<\/h3>\n<p>\u4e3a\u4e86\u4f7fReact.memo\u8d77\u4f5c\u7528\uff0c\u5fc5\u987b\u5c06\u6240\u6709\u975e\u539f\u59cb\u503c\u7684props\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002<\/p>\n<p>\u8bf7\u53c2\u8003Codesandbox\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u574f\u7684<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Child<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildMemo<\/span>\r\n      <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">{<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}<\/span><span class=\"si\">}<\/span> <span class=\"c1\">\/\/ 2. `value` \u304c\u5909\u66f4\u3055\u308c\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b<\/span>\r\n    <span class=\"p\">\/&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Child<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}),<\/span> <span class=\"p\">[])<\/span> <span class=\"c1\">\/\/ 2. `value` \u306f\u5909\u66f4\u3055\u308c\u306a\u3044<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildMemo<\/span>\r\n      <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">value<\/span><span class=\"si\">}<\/span> <span class=\"c1\">\/\/ 3. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044<\/span>\r\n    <span class=\"p\">\/&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u2705 React.memo\uff1a\u4f5c\u4e3aprops\u6216\u5b50\u7ec4\u4ef6<\/h3>\n<p>React.memo \u5fc5\u987b\u5728\u4f5c\u4e3a\u5b50\u9879\u548c\u5c5e\u6027\u4f20\u9012\u7684\u5143\u7d20\u4e0a\u4f7f\u7528\u3002<br \/>\n\u5373\u4f7f\u5bf9\u7236\u7ec4\u4ef6\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u4e5f\u65e0\u6548\u3002\u7531\u4e8e\u5b50\u9879\u548c\u5c5e\u6027\u662f\u5bf9\u8c61\uff0c\u56e0\u6b64\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u90fd\u4f1a\u53d1\u751f\u53d8\u5316\u3002<\/p>\n<p>\u6709\u5173React\u5143\u7d20\u3001\u5b50\u8282\u70b9\u3001\u7236\u8282\u70b9\u548c\u91cd\u65b0\u6e32\u67d3\u7684\u795e\u79d8\u4e4b\u5904\u7684\u8be6\u7ec6\u8bf4\u660e\uff0c\u8bf7\u53c2\u8003\u8fd9\u91cc\u7684\u8bf4\u660e\uff1aReact\u5143\u7d20\u3001\u5b50\u8282\u70b9\u3001\u7236\u8282\u70b9\u548c\u91cd\u65b0\u6e32\u67d3\u7684\u5965\u79d8\u4e4b\u8c1c\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u5dee\u52b2\u7684<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Child<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildMemo<\/span> <span class=\"na\">left<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* \r\n2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"p\">}<\/span>\r\n    <span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span> \r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">GrandChild<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* \r\n2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">ChildMemo<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">SomethingMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Something<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">GrandChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">GrandChild<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">left<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">SomethingMemo<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* \r\n2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044 *\/<\/span><span class=\"p\">}<\/span>\r\n    <span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">GrandChildMemo<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* \r\n2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044 *\/<\/span><span class=\"p\">}<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"err\">\/<\/span><span class=\"na\">Child<\/span><span class=\"p\">&gt;<\/span>\r\n  )\r\n}\r\n<\/code><\/pre>\n<h2>\u4f7f\u7528useMemo\/useCallback\u6765\u63d0\u9ad8\u91cd\u65b0\u6e32\u67d3\u7684\u6027\u80fd<\/h2>\n<h3>\u26d4\ufe0f\u53cd\u6a21\u5f0f: \u5bf9\u4e8e props \u4e0d\u5fc5\u8981\u7684 useMemo\/useCallback<\/h3>\n<p>\u5373\u4f7f\u5c06props\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u4e5f\u65e0\u6cd5\u9632\u6b62\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002<br \/>\n\u53ea\u8981\u7236\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\uff0c\u4e0d\u8bba\u4e0eprops\u662f\u5426\u76f8\u5173\uff0c\u90fd\u4f1a\u89e6\u53d1\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u8bf7\u53c2\u8003CodeSandbox\u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}))<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span>\r\n      <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">value<\/span><span class=\"si\">}<\/span>  <span class=\"si\">{<\/span><span class=\"cm\">\/* \u95a2\u4fc2\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"p\">}<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u2705 \u4f7f\u7528 useMemo\/useCallback \u662f\u5fc5\u8981\u7684\u3002<\/h3>\n<p>\u5982\u679c\u5b50\u7ec4\u4ef6\u88ab React.memo \u5305\u88c5\uff0c\u90a3\u4e48\u9700\u8981\u5bf9\u6240\u6709\u975e\u539f\u59cb\u503c\u7684 props \u8fdb\u884c\u8bb0\u5fc6\u5316\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Child<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">})<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildMemo<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 3. \u95a2\u4fc2\u306a\u3057 *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">value<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u30e1\u30e2\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">\/&gt;<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u4e86\u50cf useEffect\u3001useMemo\u3001useCallback \u8fd9\u6837\u7684\u94a9\u5b50\uff0c\u5e76\u4e14\u4f7f\u7528\u4e86\u975e\u539f\u59cb\u503c\u4f5c\u4e3a\u4f9d\u8d56\u5173\u7cfb\uff0c\u90a3\u4e48\u5b83\u4eec\u5e94\u8be5\u8fdb\u884c\u8bb0\u5fc6\u5316\u5904\u7406\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}))<\/span>\r\n\r\n  <span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ do something<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">])<\/span> <span class=\"c1\">\/\/ 2. \u30e1\u30e2\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">...<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u2705 \u4e3a\u9ad8\u6210\u672c\u7684\u8ba1\u7b97\u4f7f\u7528 useMemo<\/h3>\n<p>\u4f7f\u7528useMemo\u7684\u4e00\u4e2a\u7528\u4f8b\u662f\u907f\u514d\u5728\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u6267\u884c\u9ad8\u6210\u672c\u7684\u8ba1\u7b97\u3002<\/p>\n<p>\u7136\u800c\uff0c\u7531\u4e8euseMemo\u5177\u6709\u4e00\u4e9b\u5f00\u9500\uff08\u4f1a\u6d88\u8017\u4e00\u4e9b\u5185\u5b58\uff0c\u4f7f\u521d\u59cb\u6e32\u67d3\u7a0d\u5fae\u53d8\u6162\uff09\uff0c\u56e0\u6b64\u5e76\u4e0d\u5e94\u8be5\u5728\u6240\u6709\u7684\u8ba1\u7b97\u4e2d\u4f7f\u7528\u3002\u5728React\u4e2d\uff0c\u7ec4\u4ef6\u7684\u6302\u8f7d\u548c\u66f4\u65b0\u901a\u5e38\u662f\u6700\u8017\u8d39\u6027\u80fd\u7684\u8ba1\u7b97\uff08\u9664\u975e\u5b9e\u9645\u4e0a\u9700\u8981\u5728\u524d\u7aef\u8fdb\u884c\u7d20\u6570\u8ba1\u7b97\u7b49\u60c5\u51b5\uff09\u3002<\/p>\n<p>useMemo \u7684\u5178\u578b\u7528\u4f8b\u662f\u5bf9 React \u5143\u7d20\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002React \u5143\u7d20\u901a\u5e38\u662f\u5bf9\u73b0\u6709\u6e32\u67d3\u6811\u7684\u4e00\u90e8\u5206\u8fdb\u884c\u56de\u4f20\uff0c\u6216\u8005\u662f\u8fd4\u56de\u65b0\u5143\u7d20\u7684 `map` \u51fd\u6570\u751f\u6210\u7684\u6e32\u67d3\u6811\u7ed3\u679c\u3002<\/p>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8eJavaScript\u7684\u201c\u7eaf\u51c0\u201d\u64cd\u4f5c\uff0c\u5982\u6570\u7ec4\u7684\u6392\u5e8f\u6216\u8fc7\u6ee4\u7b49\uff0c\u4e0e\u7ec4\u4ef6\u66f4\u65b0\u76f8\u6bd4\uff0c\u5176\u4ee3\u4ef7\u5f80\u5f80\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u574f\u7684 de)<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span> <span class=\"p\">\/&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">SomethingElse<\/span> <span class=\"p\">\/&gt;<\/span>\r\n    <span class=\"p\">&lt;\/&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">slowComponent<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">SlowComponent<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044 *\/<\/span><span class=\"p\">}<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[])<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Something<\/span> <span class=\"p\">\/&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">slowComponent<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">SomethingElse<\/span> <span class=\"p\">\/&gt;<\/span>\r\n    <span class=\"p\">&lt;\/&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h2>\u4f18\u5316\u5217\u8868\u91cd\u65b0\u6e32\u67d3\u7684\u6027\u80fd\u3002<\/h2>\n<p>\u8fd9\u4e00\u7ae0\u7684\u5185\u5bb9\u4e5f\u53ef\u4ee5\u5728\u89c6\u9891\u4e2d\u89c2\u770b\u3002<br \/>\n\u4f60\u53ef\u4ee5\u5728\u4ee5\u4e0b\u94fe\u63a5\u4e2d\u89c2\u770b\uff1ahttps:\/\/youtu.be\/76OedwmXlYY\u3002<\/p>\n<p>\u9664\u4e86\u5e38\u89c4\u7684\u91cd\u6e32\u67d3\u89c4\u5219\u548c\u6a21\u5f0f\u5916\uff0ckey\u5c5e\u6027\u8fd8\u4f1a\u5f71\u54cdReact\u5217\u8868\u7684\u6027\u80fd\u3002<\/p>\n<p>\u91cd\u8981\u63d0\u793a\uff1a\u4ec5\u4ec5\u6307\u5b9akey\u5c5e\u6027\u4e0d\u80fd\u63d0\u9ad8\u5217\u8868\u7684\u6027\u80fd\u3002\u4e3a\u4e86\u9632\u6b62\u5217\u8868\u5143\u7d20\u91cd\u65b0\u6e32\u67d3\uff0c\u9700\u8981\u7528React.memo\u6765\u5305\u88f9\u5217\u8868\u5143\u7d20\u3002<\/p>\n<p>\u5173\u952e\u7684\u503c\u5e94\u8be5\u662f\u4e00\u4e2a\u5728\u91cd\u65b0\u6e32\u67d3\u4e4b\u95f4\u4fdd\u6301\u4e00\u81f4\u7684\u5b57\u7b26\u4e32\uff0c\u9002\u7528\u4e8e\u5217\u8868\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4f1a\u4f7f\u7528\u5217\u8868\u9879\u7684 id \u6216\u8005\u6570\u7ec4\u7684\u7d22\u5f15\u6765\u5b9e\u73b0\u3002<\/p>\n<p>\u5982\u679c\u5217\u8868\u662f\u9759\u6001\u7684\uff08\u65e0\u6cd5\u6dfb\u52a0\/\u5220\u9664\/\u63d2\u5165\/\u6392\u5e8f\u5143\u7d20\uff09\uff0c\u90a3\u4e48\u4f7f\u7528\u6570\u7ec4\u7684\u7d22\u5f15\u4f5c\u4e3a\u952e\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n<p>\u4f7f\u7528\u52a8\u6001\u5217\u8868\u6765\u64cd\u4f5c\u6570\u7ec4\u7684\u7d22\u5f15\u4f1a\u5bfc\u81f4\u4ee5\u4e0b\u95ee\u9898\uff1a<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ea\u30b9\u30c8\u30a2\u30a4\u30c6\u30e0\u304c\u72b6\u614b\u3092\u6301\u3063\u3066\u3044\u305f\u308a\uff08\u30d5\u30a9\u30fc\u30e0\u5165\u529b\u306e\u3088\u3046\u306a)\u975e\u5236\u5fa1\u8981\u7d20\u3092\u542b\u3080\u5834\u5408\u3001\u30d0\u30b0\u304c\u767a\u751f\u3057\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30ea\u30b9\u30c8\u30a2\u30a4\u30c6\u30e0\u304c React.memo \u3067\u30e9\u30c3\u30d7\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3057\u307e\u3059<\/ul>\n<p>\u8bf7\u53c2\u8003\u300cReact key\u5c5e\u6027\uff1a\u4f18\u5316\u5217\u8868\u6027\u80fd\u7684\u6700\u4f73\u5b9e\u8df5\u300d\u4ee5\u83b7\u53d6\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<p>\u8bf7\u53c2\u8003\u9759\u6001\u5217\u8868\u793a\u4f8b\u4e2d\u7684 codesandbox\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u52a8\u6001\u5217\u8868\u793a\u4f8b\u3002<\/p>\n<p>\u574f<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span>\r\n          <span class=\"na\">item<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">item<\/span><span class=\"si\">}<\/span>\r\n          <span class=\"na\">key<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 3. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u9632\u3052\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 *\/<\/span><span class=\"p\">}<\/span>\r\n      <span class=\"p\">))<\/span><span class=\"si\">}<\/span>;\r\n    <span class=\"p\">&lt;\/&gt;;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Child<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildMemo<\/span>\r\n          <span class=\"na\">item<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">item<\/span><span class=\"si\">}<\/span>\r\n          <span class=\"na\">key<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044 *\/<\/span><span class=\"p\">}<\/span>\r\n      <span class=\"p\">))<\/span><span class=\"si\">}<\/span>;\r\n    <span class=\"p\">&lt;\/&gt;;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u26d4\ufe0f \u53cd\u6a21\u5f0f\uff1a\u4f7f\u7528\u968f\u673a\u503c\u4f5c\u4e3a\u5217\u8868\u7684\u952e<\/h3>\n<p>\u8bf7\u4e0d\u8981\u5c06\u968f\u673a\u751f\u6210\u7684\u503c\u7528\u4f5c\u5217\u8868\u7684 key \u5c5e\u6027\u503c\u3002\u8fd9\u5c06\u5bfc\u81f4 React \u5728\u91cd\u65b0\u6e32\u67d3\u65f6\u91cd\u65b0\u6302\u8f7d\u5217\u8868\u9879\uff0c\u5e76\u53ef\u80fd\u5bfc\u81f4\u4ee5\u4e0b\u60c5\u51b5\u53d1\u751f\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ea\u30b9\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u975e\u5e38\u306b\u60aa\u304f\u306a\u308a\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30ea\u30b9\u30c8\u30a2\u30a4\u30c6\u30e0\u304c\u72b6\u614b\u3092\u6301\u3063\u3066\u3044\u305f\u308a\uff08\u30d5\u30a9\u30fc\u30e0\u5165\u529b\u306e\u3088\u3046\u306a)\u975e\u5236\u5fa1\u8981\u7d20\u3092\u542b\u3080\u5834\u5408\u3001\u30d0\u30b0\u304c\u767a\u751f\u3057\u307e\u3059<\/ul>\n<p>\u8bf7\u53c2\u8003CodeSandbox\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u574f\u7684<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Child<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildMemo<\/span>\r\n          <span class=\"na\">item<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">item<\/span><span class=\"si\">}<\/span>\r\n          <span class=\"na\">key<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">random<\/span><span class=\"p\">()<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u305f\u3073\u306b\u518d\u30de\u30a6\u30f3\u30c8\u3055\u308c\u3066\u3057\u307e\u3046 *\/<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"p\">\/&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* 2. \u518d\u30de\u30a6\u30f3\u30c8!! *\/<\/span><span class=\"p\">}<\/span> \r\n      <span class=\"p\">))<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u6839\u636e\u4e0a\u4e0b\u6587\u9632\u6b62\u53d1\u751f\u91cd\u65b0\u6e32\u67d3\u3002<\/h2>\n<h3>\u9632\u6b62\u91cd\u65b0\u6e32\u67d3\u4e0a\u4e0b\u6587\uff1a\u63d0\u4f9b\u8005\u503c\u7684\u8bb0\u5fc6\u5316<\/h3>\n<p>\u5982\u679cContext API\u7684Context Provider\u6ca1\u6709\u653e\u7f6e\u5728\u5e94\u7528\u7a0b\u5e8f\u7684\u6839\u7ec4\u4ef6\u4e2d\uff0c\u5e76\u4e14Context Provider\u7684\u7956\u5148\u7ec4\u4ef6\u53d1\u751f\u53d8\u5316\u5bfc\u81f4Context Provider\u672c\u8eab\u91cd\u65b0\u6e32\u67d3\uff0c\u90a3\u4e48\u9700\u8981\u5bf9\u5176\u503c\u8fdb\u884c\u5b58\u50a8\u7f13\u5b58\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 codesandbox \u4e0a\u7684\u793a\u4f8b<\/p>\n<p>\u574f<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span>\r\n     <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">{<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. `value` \u304c\u5909\u66f4\u3055\u308c *\/<\/span><span class=\"si\">}<\/span>\r\n   <span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u3059\u3079\u3066\u304c\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b! *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d\u7684\u3002 de.)<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 1. \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">memoValue<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}),<\/span> <span class=\"p\">[])<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span>\r\n      <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">memoValue<\/span><span class=\"si\">}<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u540c\u3058\u5024\u306e\u307e\u307e *\/<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 3. \u4f55\u3082\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044! *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u9632\u6b62\u91cd\u65b0\u6e32\u67d3\u4e0a\u4e0b\u6587\uff1a\u6570\u636e\u4e0eAPI\u7684\u5206\u79bb<\/h3>\n<p>\u5982\u679c\u5728\u4e0a\u4e0b\u6587\u4e2d\u6709\u6570\u636e\u548cAPI\uff08getter\u548csetter\uff09\u7684\u7ec4\u5408\uff0c\u53ef\u4ee5\u5c06\u5b83\u4eec\u62c6\u5206\u4e3a\u540c\u4e00\u4e2a\u7ec4\u4ef6\u4e2d\u7684\u4e0d\u540c\u63d0\u4f9b\u8005\u3002\u901a\u8fc7\u8fd9\u6837\u505a\uff0c\u4ec5\u4f7f\u7528API\u7684\u7ec4\u4ef6\u5c06\u4e0d\u518d\u5728\u6570\u636e\u53d8\u66f4\u65f6\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u5173\u4e8e\u8fd9\u79cd\u6a21\u5f0f\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u6b64\u5904\uff1a\u5982\u4f55\u4f7f\u7528Context\u7f16\u5199\u9ad8\u6027\u80fd\u7684React\u5e94\u7528\u7a0b\u5e8f<\/p>\n<p>\u8bf7\u67e5\u770b CodeSandbox \u7684\u793a\u4f8b\u3002<\/p>\n<p>\u7cdf\u7cd5\u7684<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setState<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 1. \u72b6\u614b\u304c\u5909\u66f4\u3055\u308c\u308b<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span>\r\n      <span class=\"na\">data<\/span><span class=\"p\">:<\/span> <span class=\"nx\">state<\/span><span class=\"p\">,<\/span> \r\n      <span class=\"na\">api<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setState<\/span><span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"p\">}),<\/span>\r\n    <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">],<\/span>\r\n  <span class=\"p\">);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span>\r\n     <span class=\"p\">{<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}<\/span>\r\n   <span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u3059\u3079\u3066\u306e Consumer \u304c\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setState<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 1. \u72b6\u614b\u304c\u5909\u66f4\u3055\u308c\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">DataContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">state<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">ApiContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span>\r\n        <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">setState<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. API \u306e Consumer \u306f\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nc\">ApiContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">DataContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u2705 \u9632\u6b62\u4e0a\u4e0b\u6587\u91cd\u65b0\u6e32\u67d3\uff1a\u5c06\u6570\u636e\u5206\u5272\u4e3a\u5757<\/h3>\n<p>\u5f53\u4e0a\u4e0b\u6587\u4e2d\u5b58\u5728\u591a\u4e2a\u72ec\u7acb\u7684\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u5728\u540c\u4e00\u4e2a\u63d0\u4f9b\u7a0b\u5e8f\u5185\u5c06\u5b83\u4eec\u5206\u5272\u4e3a\u5c0f\u7684\u63d0\u4f9b\u7a0b\u5e8f\u3002\u901a\u8fc7\u8fd9\u6837\u505a\uff0c\u53ef\u4ee5\u4ec5\u91cd\u65b0\u6e32\u67d3\u5df2\u66f4\u6539\u6570\u636e\u7684\u4f7f\u7528\u8005\u3002<\/p>\n<p>\u5173\u4e8e\u8fd9\u79cd\u6a21\u5f0f\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u67e5\u770b\u8fd9\u91cc\uff1a\u5982\u4f55\u4f7f\u7528Context\u7f16\u5199\u9ad8\u6027\u80fd\u7684React\u5e94\u7528\u7a0b\u5e8f<\/p>\n<p>\u8bf7\u53c2\u8003Codesandbox\u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u7cdf\u7cd5\u7684 de)<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">first<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setFirst<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 1. first \u304c\u5909\u66f4\u3055\u308c\u308b<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">second<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setSecond<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">();<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">value<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span>\r\n      <span class=\"na\">first<\/span><span class=\"p\">:<\/span> <span class=\"nx\">first<\/span><span class=\"p\">,<\/span> \r\n      <span class=\"na\">second<\/span><span class=\"p\">:<\/span> <span class=\"nx\">second<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">}),<\/span>\r\n    <span class=\"p\">[<\/span><span class=\"nx\">first<\/span><span class=\"p\">,<\/span> <span class=\"nx\">second<\/span><span class=\"p\">],<\/span>\r\n  <span class=\"p\">);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span>\r\n     <span class=\"p\">{<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}<\/span>\r\n   <span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. \u3059\u3079\u3066\u306e Consumer \u304c\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b *\/<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">first<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setFirst<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 1. first \u304c\u5909\u66f4\u3055\u308c\u308b<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">second<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setSecond<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">();<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Data1Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">frist<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Data2Context<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span>\r\n        <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">second<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&gt;<\/span> <span class=\"si\">{<\/span><span class=\"cm\">\/* 2. second \u306e Consumer \u306f\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044 *\/<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"si\">{<\/span><span class=\"nx\">children<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nc\">ApiContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">DataContext<\/span><span class=\"p\">.<\/span><span class=\"nc\">Provider<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h3>\u9632\u6b62\u4e0a\u4e0b\u6587\u91cd\u65b0\u6e32\u67d3\u7684\u95ee\u9898\uff1a\u4e0a\u4e0b\u6587\u9009\u62e9\u5668\uff08\u9009\u62e9\u4e0a\u4e0b\u6587\u90e8\u5206\u7684\u503c\uff09<\/h3>\n<p>\u65e0\u6cd5\u9632\u6b62\u53ea\u4f7f\u7528\u4e0a\u4e0b\u6587\u7684\u67d0\u4e9b\u503c\u7684\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u3002<br \/>\n\u5373\u4f7f\u4f7f\u7528\u4e86useMemo\u94a9\u5b50\uff0c\u6570\u636e\u6ca1\u6709\u88ab\u66f4\u6539\u4e5f\u662f\u4e00\u6837\u7684\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u901a\u8fc7\u4f7f\u7528\u9ad8\u9636\u7ec4\u4ef6\u548c React.memo\uff0c\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u4e8e\u4e0a\u4e0b\u6587\u9009\u62e9\u5668\uff08\u4ec5\u9009\u62e9\u4e0a\u4e0b\u6587\u7684\u90e8\u5206\u503c\uff09\u7684\u529f\u80fd\u3002<\/p>\n<p>\u8bf7\u70b9\u51fb\u67e5\u770b\u5173\u4e8e\u8fd9\u4e2a\u6a21\u5f0f\u7684\u8be6\u7ec6\u5185\u5bb9\uff1aReact Hooks \u65f6\u4ee3\u7684\u9ad8\u9636\u7ec4\u4ef6<\/p>\n<p>\u8bf7\u53c2\u8003 CodeSandbox \u4e0a\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u4e0d\u597d\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">useSomething<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">something<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">Context<\/span><span class=\"p\">);<\/span> <span class=\"c1\">\/\/ 1. \"something\" \u304c\u5909\u66f4\u3055\u308c\u3066\u3044\u306a\u304f\u3066\u3082\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">something<\/span><span class=\"p\">,<\/span> <span class=\"p\">[<\/span><span class=\"nx\">something<\/span><span class=\"p\">]);<\/span> <span class=\"c1\">\/\/ 2. useMemo \u306f\u610f\u5473\u306a\u3057<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">something<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useSomething<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ 3. \"something\" \u304c\u5909\u66f4\u3055\u308c\u3066\u3044\u306a\u304f\u3066\u3082\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">...<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u597d\u7684<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">withSomething<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">Component<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">MemoComponent<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">Component<\/span><span class=\"p\">);<\/span> <span class=\"c1\">\/\/ 1. Component \u304c\u3053\u3053\u3067\u30e1\u30e2\u5316\u3055\u308c\u308b<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">something<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">Context<\/span><span class=\"p\">);<\/span> \r\n\r\n    <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">MemoComponent<\/span> <span class=\"na\">something<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">something<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span> <span class=\"c1\">\/\/ 2. \"something\" \u304c\u5909\u66f4\u3055\u308c\u305f\u6642\u3060\u3051\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">withSomething<\/span><span class=\"p\">((<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">something<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"c1\">\/\/ 3. \"something\" \u304c\u5909\u66f4\u3055\u308c\u305f\u6642\u3060\u3051\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"p\">...<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<h1>\u7ffb\u8b6f\u8005\u7684\u5f8c\u8a18<\/h1>\n<p>\u5728\u53c2\u4e0e\u4f7f\u7528React\u8fdb\u884c\u5f00\u53d1\u65f6\uff0c\u6211\u5f00\u59cb\u63a2\u7d22\u826f\u597d\u7684\u7ec4\u4ef6\u8bbe\u8ba1\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u5173\u6ce8\u91cd\u65b0\u6e32\u67d3\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u6211\u9047\u5230\u4e86\u8fd9\u7bc7\u535a\u5ba2\u6587\u7ae0\u3002<\/p>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u603b\u7ed3\u4e86\u4e00\u4e9b\u6280\u5de7\uff0c\u4ee5\u7d27\u51d1\u7684\u65b9\u5f0f\u9632\u6b62\u8fdb\u884c\u5404\u79cd\u91cd\u6e32\u67d3\u3002\u4f46\u662f\uff0c\u6700\u57fa\u672c\u7684React\u7ec4\u4ef6\u8bbe\u8ba1\u539f\u5219\u53ef\u80fd\u662f\u6b63\u786e\u4f7f\u7528&#8221;\u7ec4\u5408&#8221;\u3002<\/p>\n<p>\u6211\u8ba4\u4e3a&#8221;\u7ec4\u5408&#8221;\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7ecf\u5e38\u4e0e&#8221;\u7ee7\u627f&#8221;\u4e00\u8d77\u8ba8\u8bba\u7684\u6982\u5ff5\u3002\u7ee7\u627f\u662f\u4e00\u4e2a&#8221;is-a&#8221;\u5173\u7cfb\uff08\u732b &#8220;\u662f\u4e00\u4e2a&#8221; \u52a8\u7269\uff0c\u81ea\u884c\u8f66 &#8220;\u662f\u4e00\u4e2a&#8221;\u8f66\u8f86\uff09\uff0c\u800c\u7ec4\u5408\u662f\u4e00\u4e2a&#8221;has-a&#8221;\u5173\u7cfb\uff08\u5bf9\u8bdd\u6846 &#8220;\u6709\u4e00\u4e2a&#8221; \u6309\u94ae\uff0c\u81ea\u884c\u8f66 &#8220;\u6709\u4e00\u4e2a&#8221; \u8f6e\u5b50\uff09\uff0c\u5728\u6bd4\u7ee7\u627f\u66f4\u591a\u5730\u4f7f\u7528\u7ec4\u5408\u6765\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u7684\u8bed\u5883\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u8bcd\u3002<\/p>\n<p>\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u4ecb\u7ecd\u4e86\u4ee5\u4e0b3\u79cd\u4f7f\u7528\u6784\u56fe\u6280\u5de7\u7684\u65b9\u6cd5\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">moving state down\uff08\u72b6\u614b\u3092\u4e0b\u306b\u79fb\u52d5\u3059\u308b\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">childrend as props\uff08props \u3068\u3057\u3066\u306e children\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">components as props\uff08props \u3068\u3057\u3066\u306e component\uff09<\/ul>\n<p>\u5728\u5404\u79cd\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u5bf9\u4e8e\u76f8\u4f3c\u6280\u5de7\u7684\u63a8\u8350\u3002<\/p>\n<p>\u4f18\u5316React\u91cd\u65b0\u6e32\u67d3\u7684\u4e00\u4e2a\u7b80\u5355\u6280\u5de7- Kent C. Dodds<\/p>\n<blockquote><p>\u5c06\u6602\u8d35\u7684\u7ec4\u4ef6\u201c\u63d0\u5347\u201d\u5230\u4e00\u4e2a\u4e0d\u7ecf\u5e38\u88ab\u6e32\u67d3\u7684\u7236\u7ec4\u4ef6\u4e2d\u3002<br \/>\n\u7136\u540e\u5c06\u6602\u8d35\u7684\u7ec4\u4ef6\u4f5c\u4e3a\u5c5e\u6027\u4f20\u9012\u3002<\/p><\/blockquote>\n<p>\u5728\u4f60\u5907\u5fd8\u5f55\u4e4b\u524d\uff0c\u8fc7\u5ea6\u53cd\u5e94\u4e86\u3002<\/p>\n<blockquote><p>\u4e0b\u79fb\u72b6\u614b<br \/>\n\u63d0\u5347\u5185\u5bb9<\/p><\/blockquote>\n<p>\u6750\u8d28\u754c\u9762\u8bbe\u8ba1<\/p>\n<blockquote><p>\u5305\u88f9\u7ec4\u4ef6<br \/>\n\u7ec4\u4ef6\u5c5e\u6027<\/p><\/blockquote>\n<p>\u7ec4\u5408 vs \u7ee7\u627f &#8211; legacy.reactjs.org<\/p>\n<blockquote><p>\u6709\u4e9b\u7ec4\u4ef6\u5728\u63a5\u6536\u5230\u5b50\u5143\u7d20\u4e4b\u524d\u4e8b\u5148\u4e0d\u77e5\u9053\u5b83\u4eec\u7684\u6570\u91cf\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u4e00\u4e2a\u540d\u4e3a `children` \u7684\u7279\u6b8a prop \u6765\u8f93\u51fa\u63a5\u6536\u5230\u7684\u5b50\u5143\u7d20\u3002<br \/>\n&#8230;<br \/>\n\u901a\u8fc7\u5411\u901a\u7528\u7ec4\u4ef6\u4f20\u9012 props \u5e76\u8fdb\u884c\u8bbe\u7f6e\uff0c\u53ef\u4ee5\u521b\u5efa\u66f4\u4e13\u7528\u7684\u7ec4\u4ef6\u3002<br \/>\n&#8230;<br \/>\n\u901a\u8fc7 props \u548c\u7ec4\u5408\uff0c\u53ef\u4ee5\u83b7\u5f97\u8db3\u591f\u7075\u6d3b\u6027\uff0c\u4ee5\u660e\u786e\u4e14\u5b89\u5168\u5730\u81ea\u5b9a\u4e49\u7ec4\u4ef6\u7684\u5916\u89c2\u548c\u884c\u4e3a\u3002<\/p><\/blockquote>\n<p>\u5728\u4f7f\u7528\u4e0a\u4e0b\u6587\u4e4b\u524d &#8211; \u4f7f\u7528\u4e0a\u4e0b\u6587\u6df1\u5165\u4f20\u9012\u6570\u636e &#8211; react.dev<\/p>\n<blockquote><p>\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u4ece\u4f20\u9012\u9053\u5177\u7684\u65b9\u6cd5\u5f00\u59cb\u3002<br \/>\n&#8230;<br \/>\n\u8003\u8651\u5c06\u7ec4\u4ef6\u63d0\u53d6\u51fa\u6765\uff0c\u5c06children\u4f5c\u4e3aJSX\u4f20\u9012\u7684\u65b9\u6cd5\u3002<br \/>\n\u5982\u679c\u60a8\u53d1\u73b0\u5728\u4e2d\u95f4\u7ec4\u4ef6\u4e2d\u65e0\u9700\u4f7f\u7528\u67d0\u4e9b\u6570\u636e\uff0c\u53ea\u9700\u8981\u5c06\u5176\u5411\u4e0b\u4f20\u9012\uff0c\u5e76\u4e14\u5728\u591a\u4e2a\u5c42\u6b21\u4e0a\u8fdb\u884c\u4f20\u9012\uff0c\u90a3\u4e48\u53ef\u80fd\u662f\u56e0\u4e3a\u60a8\u5fd8\u8bb0\u4e86\u63d0\u53d6\u67d0\u4e2a\u7ec4\u4ef6\u3002\u4f8b\u5982\uff0c\u53ef\u80fd\u4f1a\u5c06\u6570\u636e\uff08\u5982post\uff09\u76f4\u63a5\u4f20\u9012\u7ed9\u4e0d\u76f4\u63a5\u4f7f\u7528\u6570\u636e\u7684\u53ef\u89c6\u5316\u7ec4\u4ef6\uff0c\u4f8b\u5982\u3002\u76f8\u53cd\uff0c\u8ba9\u6211\u4eec\u5c06Layout\u4f5c\u4e3aprops\u63a5\u6536children\uff0c\u5e76\u5c1d\u8bd5\u4ee5\u7684\u65b9\u5f0f\u8fdb\u884c\u6e32\u67d3\u3002\u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11\u6307\u5b9a\u6570\u636e\u7ec4\u4ef6\u548c\u9700\u8981\u8be5\u6570\u636e\u7ec4\u4ef6\u4e4b\u95f4\u7684\u5c42\u6b21\u6570\u3002<br \/>\n\u5982\u679c\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u884c\u4e0d\u901a\u7684\u8bdd\uff0c\u8bf7\u8003\u8651\u4f7f\u7528\u4e0a\u4e0b\u6587\u3002<\/p><\/blockquote>\n<p>\u5982\u679c\u4eca\u540e\u8981\u53c2\u4e0eReact\u7684\u5f00\u53d1\uff0c\u662f\u5426\u53ef\u4ee5\u8003\u8651\u5c06\u51fa\u73b0\u7684\u5173\u952e\u8bcd&#8221;\u7ec4\u5408&#8221;\u3001&#8221;\u5c5e\u6027&#8221;\u548c&#8221;\u5b50\u7ec4\u4ef6&#8221;\u653e\u5728\u5fc3\u91cc\uff0c\u6765\u9762\u5bf9\u7ec4\u4ef6\u8bbe\u8ba1\u5462\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u7bc7\u6587\u7ae0\u662f\u300aReact\u91cd\u6e32\u67d3\u6307\u5357\uff1a\u4e00\u5207\u90fd\u4e00\u6b21\u6027\u5904\u7406\u300b\u7684\u7ffb\u8bd1\u6587\u7ae0\u3002 \u6211\u5df2\u7ecf\u5f97\u5230\u4e86\u672c\u4eba\uff08Nadia Makarev [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38289","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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