{"id":38038,"date":"2023-01-23T04:32:35","date_gmt":"2023-11-05T20:01:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e6%a6%82%e8%bf%b0\/"},"modified":"2024-04-29T11:01:20","modified_gmt":"2024-04-29T03:01:20","slug":"react%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e6%a6%82%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e6%a6%82%e8%bf%b0\/","title":{"rendered":"React\u6027\u80fd\u4f18\u5316\u6982\u8ff0"},"content":{"rendered":"<h2>\u9996\u5148<\/h2>\n<p>\u6211\u57282021\u5e74\u4ee5\u65b0\u5165\u804c\u7684\u5f62\u5f0f\u52a0\u5165\u4e86\u4e00\u5bb6Web\u5f00\u53d1\u516c\u53f8\uff0c\u62c5\u4efb\u524d\u7aef\u5de5\u7a0b\u5e08\u7684\u804c\u4f4d\uff0c\u73b0\u5728\u662f2022\u5e74\uff0c\u5df2\u7ecf\u662f\u6211\u7684\u7b2c\u4e8c\u4e2a\u5e74\u5934\u4e86\u3002<\/p>\n<p>\u6211\u4e3b\u8981\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u4f7f\u7528React\u00d7TypeScript\u8fdb\u884c\u524d\u7aef\u5f00\u53d1\u3002<\/p>\n<p>\u8fd9\u6b21\u5c06\u603b\u7ed3\u6211\u5728\u73b0\u573a\u7ecf\u5386\u7684React\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u4f18\u5316\u3002<\/p>\n<h2>\u672c\u6587\u7684\u53d7\u4f17\u7fa4<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">React\u306e\u521d\u5fc3\u8005\u304b\u3089\u4e2d\u7d1a\u8005<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">React\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306b\u3064\u3044\u3066\u5b66\u3073\u305f\u3044\u4eba<\/ul>\n<h2>\u8fd9\u7bc7\u6587\u7ae0\u7684\u76ee\u6807<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">React\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3059\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\">React\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u65b9\u6cd5\u3092\u77e5\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>React.memo, useCallback, useMemo\u306b\u3064\u3044\u3066\u7406\u89e3\u3059\u308b<\/p>\n<h2>\u8bf7\u5141\u8bb8\u6211\u89e3\u91ca<\/h2>\n<p>React.memo, useCallback, useMemo\u3092\u4f7f\u3046\u30b3\u30b9\u30c8\u306b\u3064\u3044\u3066\u306e\u8a73\u3057\u3044\u89e3\u8aac<br \/>\n\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6570\u5024\u7684\u306a\u8a08\u6e2c\u306f\u884c\u3044\u307e\u305b\u3093<\/p>\n<p>\u5173\u4e8e\u4e0a\u8ff0\u4e24\u70b9\uff0c\u6211\u5c06\u5728\u76f8\u5173\u4f4d\u7f6e\u9644\u4e0a\u53c2\u8003\u6587\u7ae0\u94fe\u63a5\u3002<\/p>\n<h2>\u5173\u4e8eReact\u7684\u6e32\u67d3\u673a\u5236<\/h2>\n<p>\u5728\u8fdb\u884cReact\u6027\u80fd\u4f18\u5316\u65f6\uff0c\u6211\u4eec\u5c06\u89e3\u91caReact\u6e32\u67d3\u673a\u5236\u3002<\/p>\n<p>\u9996\u5148\uff0c\u6e32\u67d3\u5728React Docs BETA\u4e2d\u88ab\u89e3\u91ca\u5982\u4e0b\uff08\u5df2\u4f7f\u7528DeepL\u7ffb\u8bd1\uff09<\/p>\n<blockquote><p>\u300c\u6e32\u67d3\u300d\u662f\u6307React\u8c03\u7528\u7ec4\u4ef6\u7684\u8fc7\u7a0b\u3002<\/p>\n<p>\u5728\u9996\u6b21\u6e32\u67d3\u4e2d\uff0cReact\u4f1a\u8c03\u7528\u6839\u7ec4\u4ef6\u3002<br \/>\n\u5728\u540e\u7eed\u7684\u6e32\u67d3\u4e2d\uff0cReact\u4f1a\u8c03\u7528\u89e6\u53d1\u6e32\u67d3\u7684\u72b6\u6001\u66f4\u65b0\u51fd\u6570\u7ec4\u4ef6\u3002<\/p><\/blockquote>\n<p>\u7b80\u5355\u6765\u8bf4\uff0cReact\u5c06\u8c03\u7528\u51fd\u6570\u7ec4\u4ef6\u5e76\u6e32\u67d3\u5176\u5185\u5bb9\u79f0\u4e3a&#8221;\u6e32\u67d3&#8221;\u3002<\/p>\n<p>\u5728React\u6587\u6863BETA\u4e2d\uff0c\u6e32\u67d3\u673a\u5236\u88ab\u63cf\u8ff0\u5982\u4e0b\u3002<\/p>\n<blockquote><p>\u89e6\u53d1\u6e32\u67d3\uff08\u5c06\u5ba2\u6237\u7684\u8ba2\u5355\u9001\u8fbe\u5230\u53a8\u623f\uff09<br \/>\n\u7ec4\u4ef6\u6e32\u67d3\uff08\u5728\u53a8\u623f\u51c6\u5907\u8ba2\u5355\uff09<br \/>\n\u63d0\u4ea4\u81f3DOM\uff08\u5c06\u8ba2\u5355\u653e\u5728\u9910\u684c\u4e0a\uff09<\/p><\/blockquote>\n<p>\u6211\u5c06\u7b80\u660e\u89e3\u91ca\u4e0a\u8ff0\u6e32\u67d3\u673a\u5236\u3002<\/p>\n<h4>\u89e6\u53d1\u6e32\u67d3<\/h4>\n<p>\u89e6\u53d1\u6e32\u67d3\u7684\u4e8b\u4ef6\u6709\u4ee5\u4e0b\u4e24\u4e2a\u9009\u9879\uff1a<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u521d\u56de\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u753b\u9762\u66f4\u65b0\u6642\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/ul>\n<p>\u901a\u8fc7\u4f7f\u7528\u72b6\u6001\u66f4\u65b0\u51fd\u6570setState\u6765\u66f4\u65b0\u72b6\u6001\uff0c\u5e76\u901a\u8fc7\u66f4\u65b0\u7ec4\u4ef6\u7684\u72b6\u6001\u6765\u5b89\u6392\u4e0b\u6b21\u6e32\u67d3\uff0c\u4ece\u800c\u5b9e\u73b0\u91cd\u65b0\u6e32\u67d3(\u83b7\u53d6\u5e76\u66f4\u65b0\u5dee\u5206)\u3002<\/p>\n<h4>React\u4f1a\u5bf9\u7ec4\u4ef6\u8fdb\u884c\u6e32\u67d3\u3002<\/h4>\n<p>\u5f53\u5f00\u59cb\u6e32\u67d3\u65f6\uff0c\u4f1a\u8c03\u7528React\u7ec4\u4ef6\u6765\u786e\u5b9a\u8981\u5728\u5c4f\u5e55\u4e0a\u663e\u793a\u7684\u5185\u5bb9\u3002\u5728\u8fd9\u4e2a\u65f6\u70b9\u4e0a\uff0c\u8fd8\u6ca1\u6709\u8fdb\u884cDOM\u7684\u53cd\u6620\u5904\u7406\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u521d\u56de\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0: React\u306f\u30eb\u30fc\u30c8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u547c\u3073\u51fa\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u305d\u308c\u4ee5\u964d\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0: 1\u3067\u30c8\u30ea\u30ac\u30fc\u3068\u306a\u3063\u305f\u72b6\u614b\u66f4\u65b0\u306e\u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u547c\u3073\u51fa\u3059<\/ul>\n<p>\u5f53\u7ec4\u4ef6\u66f4\u65b0\u4e14\u62e5\u6709\u5b50\u7ec4\u4ef6\u65f6\uff0cReact\u4f1a\u63a5\u7740\u6e32\u67d3\u8fd9\u4e9b\u5b50\u7ec4\u4ef6\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u9012\u5f52\u8fdb\u884c\u7684\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/27-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-29 9.20.05.jpg\" \/><\/div>\n<p>\u5982\u679c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7236\u7ec4\u4ef6\u66f4\u65b0\u4e86\u72b6\u6001\uff0c\u5b50\u7ec4\u4ef6A\u3001\u5b50\u7ec4\u4ef6B\u3001\u5b50\u7ec4\u4ef6C\u3001\u5b50\u7ec4\u4ef6D\u4e5f\u4f1a\u89e6\u53d1\u6e32\u67d3\u3002<\/p>\n<p>\u5728\u4ee3\u7801\u4e2d\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u72b6\u614b\u66f4\u65b0\u304c\u767a\u706b\u3059\u308b\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span>\r\n<span class=\"k\">export<\/span> <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>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">onClick<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">count<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\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=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">onClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>+1<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildA<\/span> <span class=\"p\">\/&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildB<\/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<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">ChildA<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\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=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8A<span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildC<\/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<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">ChildB<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\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=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8A<span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">ChildD<\/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>\u7a0d\u5f8c\u6703\u8a73\u7d30\u89e3\u91cb\uff0c\u7576 Parent \u7d44\u4ef6\u7684\u72c0\u614b\u66f4\u65b0\u6642\uff0c\u5373\u4f7f ChildA \u5230 ChildD \u7121\u9700\u4f9d\u8cf4\u5b83\u5011\uff0c\u4ecd\u7136\u6703\u5c0e\u81f4 ChildA \u5230 ChildD \u7684\u6e32\u67d3\u8655\u7406\u88ab\u57f7\u884c\u3002<\/p>\n<p>\u901a\u8fc7\u6d88\u9664\u8fd9\u79cd\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff0c\u53ef\u4ee5\u4f18\u5316React\u7684\u6027\u80fd\u3002<\/p>\n<h4>3. React \u5c06\u66f4\u6539\u63d0\u4ea4\u5230 DOM\u3002<\/h4>\n<p>\u5728\u7ec4\u4ef6\u8fdb\u884c\u6e32\u67d3\u540e\uff0cReact\u4f1a\u5c06\u66f4\u65b0\u540e\u7684\u5185\u5bb9\u53cd\u6620\u5230DOM\u4e0a\uff0c\u4ece\u800c\u4f7f\u6d4f\u89c8\u5668\u91cd\u65b0\u7ed8\u5236\u5c4f\u5e55\u3002<\/p>\n<p>\u6982\u62ec\u6765\u8bf4\uff0cReact\u5e94\u7528\u7a0b\u5e8f\u7684\u754c\u9762\u66f4\u65b0\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e09\u4e2a\u6b65\u9aa4\u5b8c\u6210\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc<\/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\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">DOM\u3078\u5909\u66f4\u3092\u30b3\u30df\u30c3\u30c8<\/ul>\n<h2>\u5173\u4e8e\u907f\u514dState\u66f4\u65b0<\/h2>\n<p>\u4eceReact\u5b98\u65b9\u6587\u6863\u4e2d\uff0c<\/p>\n<blockquote><p>\u5982\u679c\u4f7f\u7528\u76f8\u540c\u7684\u503c\u8fdb\u884c\u66f4\u65b0\uff0cReact \u4f1a\u907f\u514d\u8fdb\u884c\u5b50\u7ea7\u6e32\u67d3\u548c\u526f\u4f5c\u7528\u6267\u884c\uff0c\u5e76\u7ed3\u675f\u5904\u7406\u3002<\/p><\/blockquote>\n<p>\u5982\u679c\u5c06\u5f53\u524d\u72b6\u6001\u548c\u76f8\u540c\u7684\u503c\u4f5c\u4e3asetState\u7684\u53c2\u6570\u4f20\u5165\uff0c\u5c06\u907f\u514d\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u6211\u6765\u770b\u770b\u6709\u5173\u4ee3\u7801\u7684\u5177\u4f53\u4f8b\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <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>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">onClick<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setCount<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\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=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">onClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>+1<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>count: <span class=\"si\">{<\/span><span class=\"nx\">count<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/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>\u5728\u4e0a\u8ff0\u7684\u7ec4\u4ef6\u4e2d\uff0c\u9996\u6b21\u5448\u73b0\u548c\u6309\u94ae\u70b9\u51fb\u65f6\uff0c\u8ba1\u6570\u4f1a\u66f4\u65b0\u4e3a1\uff0c\u4ece\u800c\u89e6\u53d1\u91cd\u65b0\u5448\u73b0\u3002<\/p>\n<p>\u70b9\u51fb\u6309\u94ae\u540e\uff0c\u5982\u679c\u5f53\u524d\u7684\u72b6\u6001\u4e3a1\uff0c\u5e76\u4e14setState\u7684\u53c2\u6570\u503c\u4e5f\u4e3a1\uff0c\u5219\u5f53\u524d\u4f4d\u7f6e\u548c\u66f4\u65b0\u503c\u76f8\u540c\uff0c\u56e0\u6b64\u4e0d\u4f1a\u53d1\u751f\u91cd\u65b0\u6e32\u67d3\u3002(\u88ab\u907f\u514d)<\/p>\n<h2>React\u6027\u80fd\u4f18\u5316<\/h2>\n<p>\u5728\u8fdb\u884cReact\u6027\u80fd\u4f18\u5316\u65f6\uff0c\u6211\u4eec\u8fd9\u6b21\u5c06\u4ecb\u7ecd\u4ee5\u4e0b\u4e09\u4e2a\u65b9\u9762\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">React.memo<\/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\">useCallback<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">useMemo<\/ul>\n<p>\u6211\u4eec\u5c06\u5206\u522b\u8be6\u7ec6\u5730\u8fdb\u884c\u67e5\u770b\u3002<\/p>\n<h3>\u8bb0\u5fc6\u5316\u7ec4\u4ef6 (React.memo)<\/h3>\n<p>React.memo\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u5982\u4e0b\u89e3\u91ca\u6240\u8ff0\u3002<\/p>\n<blockquote><p>\u5982\u679c\u4e00\u4e2a\u7ec4\u4ef6\u5728\u7ed9\u5b9a\u76f8\u540c\u7684 props \u540e\u6e32\u67d3\u51fa\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u53ef\u4ee5\u7528 React.memo \u5305\u88f9\u5b83\u6765\u8bb0\u5fc6\u7ed3\u679c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002\u6362\u53e5\u8bdd\u8bf4\uff0cReact \u53ef\u4ee5\u8df3\u8fc7\u7ec4\u4ef6\u7684\u6e32\u67d3\u5e76\u91cd\u7528\u4e0a\u4e00\u6b21\u7684\u6e32\u67d3\u7ed3\u679c\u3002<\/p><\/blockquote>\n<p>\u5f53\u4f7f\u7528React.memo\u5c06\u5b50\u7ec4\u4ef6\u5305\u88f9\u8d77\u6765\u540e\uff0c\u7a0d\u4f5c\u4fee\u6539\u5373\u53ef\u4f7f\u5f97\u5b50\u7ec4\u4ef6\u5728\u63a5\u6536\u6765\u81ea\u7236\u7ec4\u4ef6\u7684props\u65f6\uff0c\u5982\u679c\u503c\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u5219\u53ef\u4ee5\u8df3\u8fc7\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0c\u60a8\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u800c\u4e0d\u89e6\u53d1\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\u3002<\/p>\n<p>\u3010React.memo\u7684\u8bed\u6cd5\u3011<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">memo<\/span><span class=\"p\">(<\/span><span class=\"nx\">\u30e1\u30e2\u5316\u3057\u305f\u3044\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u4ee5\u4e00\u4e2a\u7ec4\u4ef6\u7684\u4f8b\u5b50\u6765\u786e\u8ba4\u7236\u6bcd\u548c\u5b50\u5973\u7ba1\u7406\u548c\u66f4\u65b0\u4e0d\u540c\u7684\u8ba1\u6570\u548c\u72b6\u6001\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/59-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 7.19.15.jpg\" \/><\/div>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <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>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">parentCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setParentCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setChildCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addParentCount<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setParentCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">parentCount<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addChildCount<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setChildCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">childCount<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\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=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">addParentCount<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u89aa\u306e\u30ab\u30a6\u30f3\u30c8\u3092+1<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u89aa\u306e\u30ab\u30a6\u30f3\u30c8: <span class=\"si\">{<\/span><span class=\"nx\">parentCount<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">addChildCount<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u5b50\u306e\u30ab\u30a6\u30f3\u30c8\u3092+1<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">count<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">childCount<\/span><span class=\"si\">}<\/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<pre class=\"post-pre\"><code><span class=\"nx\">type<\/span> <span class=\"nx\">ChildProps<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">count<\/span><span class=\"p\">:<\/span> <span class=\"nx\">number<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">ChildProps<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\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=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u5b50\u306ecount:<span class=\"si\">{<\/span><span class=\"nx\">count<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/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>\u70b9\u51fb\u589e\u52a0\u5b50\u7ec4\u4ef6\u8ba1\u6570\u7684\u6309\u94ae\u540e\uff0c\u53ef\u4ee5\u786e\u8ba4\u7236\u7ec4\u4ef6\u548c\u5b50\u7ec4\u4ef6\u90fd\u5df2\u88ab\u6e32\u67d3\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/63-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 7.39.44.jpg\" \/><\/div>\n<p>\u6211\u5011\u9ede\u64ca\u540c\u6a23\u589e\u52a0\u7236\u7d44\u4ef6\u8a08\u6578\u7684\u6309\u9215\uff0c\u5728\u9019\u6a23\u505a\u6642\uff0c\u6211\u5011\u53ef\u4ee5\u78ba\u8a8d\u7236\u7d44\u4ef6\u548c\u5b50\u7d44\u4ef6\u90fd\u6703\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/65-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 7.41.10.jpg\" \/><\/div>\n<p>\u5f53\u7236\u7ec4\u4ef6\u7684parentCount\u5728\u6b64\u5904\u88ab\u66f4\u65b0\u65f6\uff0c\u5c3d\u7ba1\u4f9d\u8d56\u4e8e\u5b83\u7684\u5b50\u7ec4\u4ef6\u7684\u503c\u672a\u88ab\u66f4\u65b0\uff0c\u4f46\u6e32\u67d3\u4ecd\u5c06\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>\u4e3a\u4e86\u907f\u514d\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528React.memo\u5c06\u5b50\u7ec4\u4ef6\u8fdb\u884c\u5c01\u88c5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">ChildProps<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u5b50\u4f9b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"na\">\u5b50\u306e\u30ab\u30a6\u30f3\u30c8<\/span><span class=\"p\">:{<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <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<\/code><\/pre>\n<p>\u70b9\u51fb\u589e\u52a0\u518d\u6b21\u3001\u4eb2\u7ec4\u4ef6\u7684\u8ba1\u6570\u6309\u94ae\u65f6\uff0c\u53ea\u6709\u4eb2\u7ec4\u4ef6\u4f1a\u88ab\u6e32\u67d3\uff0c\u6ca1\u6709\u503c\u66f4\u65b0\u7684ChildMemo\u7ec4\u4ef6\u4e0d\u4f1a\u88ab\u6e32\u67d3\uff0c\u53ef\u4ee5\u786e\u8ba4\u8fd9\u4e00\u70b9\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/70-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 7.45.52.jpg\" \/><\/div>\n<p>\u901a\u8fc7\u4f7f\u7528React.memo\uff0c\u53ef\u4ee5\u907f\u514d\u5728props\u4f20\u9012\u7684\u503c\u6ca1\u6709\u53d8\u5316\u65f6\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff0c\u4ece\u800c\u4f18\u5316\u6027\u80fd\u3002<\/p>\n<h3>\u4f7f\u7528useCallback<\/h3>\n<p>\u5728\u5b98\u65b9\u6587\u4ef6\u4e2d\uff0cuseCallback\u88ab\u89e3\u91ca\u5982\u4e0b\uff1a<\/p>\n<blockquote><p>\u8bf7\u4f20\u9012\u5185\u8054\u56de\u8c03\u548c\u5b83\u6240\u4f9d\u8d56\u7684\u503c\u6570\u7ec4\u3002useCallback\u8fd4\u56de\u4e00\u4e2a\u8bb0\u5fc6\u5316\u7684\u56de\u8c03\uff0c\u5e76\u4e14\u8be5\u51fd\u6570\u53ea\u6709\u5728\u4f9d\u8d56\u6570\u7ec4\u7684\u5143\u7d20\u53d1\u751f\u53d8\u5316\u65f6\u624d\u4f1a\u53d1\u751f\u53d8\u5316\u3002<br \/>\n\u8fd9\u5728\u5c06\u56de\u8c03\u4f20\u9012\u7ed9\u4f18\u5316\u4e86\u53c2\u8003\u7684\u7ec4\u4ef6\u65f6\u975e\u5e38\u65b9\u4fbf\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff08\u4f8b\u5982\u4f7f\u7528shouldComponentUpdate\u7b49\uff09\uff0c\u4ee5\u4fbf\u63d0\u9ad8\u6027\u80fd\u3002<\/p><\/blockquote>\n<p>\u82e5\u7a0d\u5fae\u7b80\u5316\u4e00\u4e0b\uff0c\u53ea\u6709\u5f53useCallback\u4e2d\u6307\u5b9a\u7684\u4f9d\u8d56\u6570\u7ec4\u7684\u4efb\u4f55\u4e00\u4e2a\u5143\u7d20\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u624d\u4f1a\u91cd\u65b0\u8ba1\u7b97\u8bb0\u5fc6\u5316\u7684\u503c\u3002<\/p>\n<p>\u5982\u679c\u4f9d\u8d56\u6570\u7ec4\u7684\u5143\u7d20\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\u3002<\/p>\n<p>\u3010useCallback\u7684\u8bed\u6cd5\u3011<\/p>\n<p>\u3010useCallback\u7684\u8bed\u6cd5\u3011\u7684\u7528\u6cd5\u662f\u9700\u8981\u5148\u4f20\u5165\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u548c\u4e00\u4e2a\u4f9d\u8d56\u9879\u6570\u7ec4\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">useCallback<\/span><span class=\"p\">(<\/span><span class=\"nx\">\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570<\/span><span class=\"p\">,<\/span> <span class=\"nx\">\u4f9d\u5b58\u914d\u5217<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u5c06\u901a\u8fc7\u4e00\u4e2a\u4ee3\u7801\u793a\u4f8b\u6765\u5177\u4f53\u89e3\u91ca\u3002<\/p>\n<p>\u5728\u5b50\u7ec4\u4ef6\u4e2d\uff0c\u9664\u4e86\u63a5\u6536count\u5c5e\u6027\u5916\uff0c\u8fd8\u80fd\u591f\u901a\u8fc7props\u4ece\u7236\u7ec4\u4ef6\u63a5\u6536\u4e00\u4e2a\u80fd\u591f\u66f4\u65b0count\u72b6\u6001\uff08+1\uff09\u7684\u51fd\u6570\uff08onClickChild\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">type<\/span> <span class=\"nx\">ChildProps<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">count<\/span><span class=\"p\">:<\/span> <span class=\"kr\">number<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"nl\">onClickChild<\/span><span class=\"p\">:<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"k\">void<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">ChildProps<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">onClickChild<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u5b50\u4f9b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">onClickChild<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u5b50\u306e\u30ab\u30a6\u30f3\u30c8\u3092<\/span><span class=\"o\">+<\/span><span class=\"mi\">1<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"na\">\u5b50\u306e\u30ab\u30a6\u30f3\u30c8<\/span><span class=\"p\">:{<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<span class=\"k\">export<\/span> <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<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <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>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">parentCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setParentCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setChildCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addParentCount<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setParentCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">parentCount<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addChildCount<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setChildCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">childCount<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">addParentCount<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u89aa\u306e\u30ab\u30a6\u30f3\u30c8\u3092<\/span><span class=\"o\">+<\/span><span class=\"mi\">1<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"na\">\u89aa\u306e\u30ab\u30a6\u30f3\u30c8<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span><span class=\"nx\">parentCount<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">ChildMemo<\/span> <span class=\"nx\">count<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">}<\/span> <span class=\"nx\">onClickChild<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">addChildCount<\/span><span class=\"p\">}<\/span> <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/83-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 22.36.42.jpg\" \/><\/div>\n<p>\u5f53\u4f60\u70b9\u51fb\u589e\u52a0\u5b50\u8ba1\u6570\u6309\u94ae(onClickChild)\u65f6\uff0c\u5728\u63a7\u5236\u53f0\u4e2d\u53ef\u4ee5\u786e\u8ba4\u7236\u7ec4\u4ef6\u548c\u5b50\u7ec4\u4ef6\u90fd\u88ab\u91cd\u65b0\u6e32\u67d3\u4e86\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/85-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 22.37.10.jpg\" \/><\/div>\n<p>\u7136\u540e\u70b9\u51fb\u6309\u94ae\u6765\u66f4\u65b0\u4e0d\u4f9d\u8d56\u4e8e\u5b50\u7ec4\u4ef6\u7684\u7236\u7ec4\u4ef6\u7684count\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/87-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 22.38.32.jpg\" \/><\/div>\n<p>\u7136\u540e\uff0c\u5c3d\u7ba1\u521a\u521a\u5bf9\u7ec4\u4ef6\u8fdb\u884c\u4e86Memo\u5316\uff0c\u4f46\u662f\u53ef\u4ee5\u786e\u8ba4\u5b50\u7ec4\u4ef6\u4ecd\u7136\u88ab\u6e32\u67d3\u51fa\u6765\u3002<\/p>\n<p>\u539f\u56e0\u4e4b\u4e00\u662f\uff0c onClickChild \u5728 props \u4e2d\u63a5\u6536\uff0c\u6bcf\u5f53\u7236\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u90fd\u4f1a\u91cd\u65b0\u8ba1\u7b97 onClickChild \uff0c\u7ed3\u679c\u662f\u5728 props \u4e2d\u4f20\u9012\u7684 onClickChild \u51fd\u6570\u4f1a\u5728 React \u5728\u5b50\u7ec4\u4ef6\u4e2d\u4e5f\u610f\u8bc6\u5230\uff0c\u5e76\u89e6\u53d1\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5373\u4f7f\u4f7f\u7528React.memo\u5bf9\u7ec4\u4ef6\u672c\u4f53\u8fdb\u884c\u4e86\u8bb0\u5fc6\u5316\uff0c\u6e32\u67d3\u4ecd\u4f1a\u8fdb\u884c\u3002<\/p>\n<p>\u4e3a\u4e86\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff0c\u8bf7\u4f7f\u7528`useCallback`\u5c06\u4f20\u9012\u7ed9`props`\u7684\u51fd\u6570(`onClickChild`)\u8fdb\u884c\u5c01\u88c5\u548c\u8bb0\u5fc6\u5316\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <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>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">parentCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setParentCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setChildCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addParentCount<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setParentCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">parentCount<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n  <span class=\"c1\">\/\/ \u30e1\u30e2\u5316<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addChildCount<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useCallback<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setChildCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">childCount<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[]);<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">addParentCount<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u89aa\u306e\u30ab\u30a6\u30f3\u30c8\u3092<\/span><span class=\"o\">+<\/span><span class=\"mi\">1<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"na\">\u89aa\u306e\u30ab\u30a6\u30f3\u30c8<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span><span class=\"nx\">parentCount<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">ChildMemo<\/span> <span class=\"nx\">count<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">}<\/span> <span class=\"nx\">onClickChild<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">addChildCount<\/span><span class=\"p\">}<\/span> <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u53ea\u8981\u6309\u4e0b\u589e\u52a0\u7236\u7ea7\u8ba1\u6570\u7684\u6309\u94ae\uff0c\u5c31\u53ef\u4ee5\u786e\u8ba4\u5b50\u7ea7\u7684\u6e32\u67d3\u5df2\u88ab\u907f\u514d\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/94-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 22.49.25.jpg\" \/><\/div>\n<p>\u7136\u800c\uff0c\u5f53\u70b9\u51fb\u589e\u52a0\u5b50\u7ec4\u4ef6\u8ba1\u6570\u7684\u6309\u94ae\u65f6\uff0c\u51fa\u73b0\u4e86\u65e0\u6cd5\u4ece1\u589e\u52a0\u7684\u95ee\u9898\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/96-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-30 22.50.33.jpg\" \/><\/div>\n<p>\u7531\u4e8e\u5728\u4e4b\u524d\u5b9a\u4e49\u7684useCallback\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e2d\u4f20\u9012\u4e86\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff0c\u6240\u4ee5\u5bfc\u81f4\u5728\u9996\u6b21\u6e32\u67d3\u65f6\uff0c\u901a\u8fc7useCallback\u5305\u88c5\u7684\u51fd\u6570\u4f1a\u4e00\u76f4\u88abReact\u5185\u90e8\u4fdd\u6301\u3002<\/p>\n<p>\u5728\u4ee3\u7801\u4e2d\uff0csetChildCount\u7684\u503c\u88ab\u6301\u7eed\u4fdd\u6301\u4e3a1\uff0c\u5bfc\u81f4\u4ece1\u5f00\u59cb\u7684\u503c\u65e0\u6cd5\u66f4\u65b0\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setChildCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addChildCount<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useCallback<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ setChildCount(childCount + 1);<\/span>\r\n    <span class=\"c1\">\/\/ setChildCount(0 + 1);<\/span>\r\n       <span class=\"nf\">setChildCount<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[]);<\/span>\r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u9632\u6b62\u8fd9\u79cd\u60c5\u51b5\u53d1\u751f\uff0c\u53ef\u4ee5\u5c06\u4e0estate\uff08\u672c\u4f8b\u4e2d\u662fchildCount\uff09\u6709\u4f9d\u8d56\u5173\u7cfb\u7684\u4f9d\u8d56\u6570\u7ec4\u4f5c\u4e3auseCallback\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u8fd9\u6837\u5728childCount\u7684\u503c\u66f4\u65b0\u65f6\uff0cuseCallback\u5185\u5b9a\u4e49\u7684\u51fd\u6570\u4f1a\u88ab\u91cd\u65b0\u8ba1\u7b97\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setChildCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">number<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">addChildCount<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useCallback<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setChildCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">childCount<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"c1\">\/\/ 1\u56de\u76ee\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u6642<\/span>\r\n    <span class=\"c1\">\/\/ setChildCount(1);<\/span>\r\n    <span class=\"c1\">\/\/ 2\u56de\u76ee\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u6642<\/span>\r\n    <span class=\"c1\">\/\/ setChildCount(1+1);<\/span>\r\n    <span class=\"c1\">\/\/ 3\u56de\u76ee\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u6642<\/span>\r\n    <span class=\"c1\">\/\/ setChildCount(2+1);<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">childCount<\/span><span class=\"p\">]);<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u4f7f\u7528useCallback\uff0c\u53ef\u4ee5\u907f\u514d\u5728\u5c06\u51fd\u6570\u901a\u8fc7props\u4f20\u9012\u65f6\u4ea7\u751f\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\u3002<\/p>\n<h3>\u4f7f\u7528 useMemo<\/h3>\n<p>useMemo\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u662f\u8fd9\u6837\u89e3\u91ca\u7684\u3002<\/p>\n<blockquote><p>\u5982\u679c\u4f9d\u8d56\u6570\u7ec4\u7684\u4efb\u4f55\u5143\u7d20\u53d1\u751f\u53d8\u5316\uff0cuseMemo\u5c06\u91cd\u65b0\u8ba1\u7b97\u7f13\u5b58\u7684\u503c\u3002\u901a\u8fc7\u8fd9\u79cd\u4f18\u5316\uff0c\u53ef\u4ee5\u907f\u514d\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u6267\u884c\u6602\u8d35\u7684\u8ba1\u7b97\u3002<\/p><\/blockquote>\n<p>React.memo\u7528\u4e8e\u5bf9\u7ec4\u4ef6\u8fdb\u884c\u8bb0\u5fc6\u5316\u5904\u7406\uff0cuseCallback\u7528\u4e8e\u5bf9\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u8bb0\u5fc6\u5316\u5904\u7406\uff0c\u800cuseMemo\u5219\u53ef\u4ee5\u5bf9\u8ba1\u7b97\u7ed3\u679c\u7684\u503c\uff08\u5982\u6570\u503c\u6216\u6e32\u67d3\u7ed3\u679c\uff09\u8fdb\u884c\u8bb0\u5fc6\u5316\u5904\u7406\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u3010useMemo\u8bed\u6cd5\u3011\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">\u30e1\u30e2\u5316\u3057\u305f\u3044\u8a08\u7b97\u30ed\u30b8\u30c3\u30af<\/span><span class=\"p\">,<\/span> <span class=\"nx\">\u4f9d\u5b58\u914d\u5217<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u5c06\u4f7f\u7528useMemo\u6765\u8bb0\u5fc6\u5316\u5148\u524d\u4f7f\u7528React.memo\u8fdb\u884c\u8bb0\u5fc6\u5316\u7684\u7ec4\u4ef6\u5185\u7684JSX\u3002<\/p>\n<p>\u5148\u524d\u4f7f\u7528 React.memo \u8fdb\u884c\u4e86\u8bb0\u5fc6\u7684 Child \u7ec4\u4ef6<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">type<\/span> <span class=\"nx\">ChildProps<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">count<\/span><span class=\"p\">:<\/span> <span class=\"nx\">number<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"nl\">onClickChild<\/span><span class=\"p\">:<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"k\">void<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">ChildProps<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">onClickChild<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u5b50\u4f9b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\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=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">onClickChild<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u5b50\u306e\u30ab\u30a6\u30f3\u30c8\u3092+1<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u5b50\u306e\u30ab\u30a6\u30f3\u30c8:<span class=\"si\">{<\/span><span class=\"nx\">count<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/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\r\n<span class=\"k\">export<\/span> <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<\/code><\/pre>\n<p>\u4f7f\u7528useMemo\u6765\u8fdb\u884cJSX\u7684\u8bb0\u5fc6\u5316<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">type<\/span> <span class=\"nx\">ChildProps<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">count<\/span><span class=\"p\">:<\/span> <span class=\"nx\">number<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"nl\">onClickChild<\/span><span class=\"p\">:<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"k\">void<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">ChildProps<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">onClickChild<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u5b50\u4f9b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u30e1\u30e2\u5316\u3057\u305f\u5024<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\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=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">onClickChild<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u5b50\u306e\u30ab\u30a6\u30f3\u30c8\u3092+1<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u5b50\u306e\u30ab\u30a6\u30f3\u30c8:<span class=\"si\">{<\/span><span class=\"nx\">count<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/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> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">onClickChild<\/span><span class=\"p\">]);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u66f4\u76f4\u89c2\u5730\u786e\u8ba4\u8bb0\u5fc6\u5316\uff0c\u6211\u5728useMemo\u7684\u5185\u90e8\u548c\u5916\u90e8\u90fd\u52a0\u5165\u4e86console\u3002<\/p>\n<p>\u6211\u5c06\u589e\u52a0\u7236\u7ec4\u4ef6\u7684\u8ba1\u6570\u5e76\u9a8c\u8bc1\u5176\u884c\u4e3a\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/116-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-10-03 8.23.21.jpg\" \/><\/div>\n<p>\u7136\u540e\uff0c\u60a8\u53ef\u4ee5\u786e\u8ba4\u5728\u6ca1\u6709\u6267\u884cuseMemo\u7684\u60c5\u51b5\u4e0b\uff08\u4f4d\u4e8euseMemo\u4e4b\u5916\uff09\uff0cconsole.log(&#8220;\u5b50\u7ec4\u4ef6\u6e32\u67d3&#8221;)\u88ab\u6267\u884c\u4e86\u3002<\/p>\n<p>\u5728\u4e4b\u524d\u4ecb\u7ecd\u7684React.memo\u4e2d\uff0c\u7531\u4e8e\u5bf9\u6574\u4e2a\u7ec4\u4ef6\u8fdb\u884c\u4e86\u8bb0\u5fc6\u5316\u5904\u7406\uff0c\u6240\u4ee5\u5f53\u6267\u884c\u7236\u7ec4\u4ef6\u7684\u8ba1\u6570\u65f6\uff0c\u5b50\u7ec4\u4ef6\u4e0d\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/119-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-10-03 8.26.32.jpg\" \/><\/div>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c1d\u8bd5\u70b9\u51fb\u5b50\u7ec4\u4ef6\u7684\u6309\u94ae\u6765\u589e\u52a0count\u7684\u6570\u91cf\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31c737434c4406c60014\/121-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-10-03 8.27.33.jpg\" \/><\/div>\n<p>\u90a3\u4e48\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u8ba4\u901a\u8fc7useMemo\u8fdb\u884c\u4e86\u8bb0\u5fc6\u5316\u7684JSX\u7684\u503c\u4e5f\u88ab\u6267\u884c\u4e86\u3002<\/p>\n<h2>\u6700\u540e<\/h2>\n<p>\u8fd9\u6b21\u603b\u7ed3\u4e86\u4e00\u4e9b\u4f18\u5316React\u6027\u80fd\u7684\u57fa\u672c\u65b9\u6cd5\uff0c\u60a8\u89c9\u5f97\u5982\u4f55\uff1f<\/p>\n<p>\u6211\u5e0c\u671b\u60a8\u80fd\u591f\u4f7f\u7528\u6211\u4ecb\u7ecd\u7684\u65b9\u6cd5\u6765\u8fdb\u884c\u66f4\u9ad8\u6027\u80fd\u7684\u5f00\u53d1\u3002<\/p>\n<p>\u6211\u6253\u7b97\u5728\u4e0b\u4e00\u6b21\u4e2d\uff0c\u4ecb\u7ecd\u6709\u5173\u6570\u636e\u901a\u4fe1\u6027\u80fd\u4f18\u5316\u7684\u4e00\u4e9b\u5185\u5bb9\u3002<\/p>\n<ul 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