{"id":38045,"date":"2023-03-01T13:11:54","date_gmt":"2023-12-21T05:20:11","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e6%9c%89%e5%85%b3react%e4%b8%ad%e7%9a%84%e8%ae%b0%e5%bf%86%e5%8c%96usecallback-usememo-react-memo%e3%80%90react%e3%80%91%e5%85%b3%e4%ba%8ereact%e4%b8%ad%e7%9a%84\/"},"modified":"2024-04-29T16:52:05","modified_gmt":"2024-04-29T08:52:05","slug":"%e3%80%90react%e3%80%91%e6%9c%89%e5%85%b3react%e4%b8%ad%e7%9a%84%e8%ae%b0%e5%bf%86%e5%8c%96usecallback-usememo-react-memo%e3%80%90react%e3%80%91%e5%85%b3%e4%ba%8ereact%e4%b8%ad%e7%9a%84","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e6%9c%89%e5%85%b3react%e4%b8%ad%e7%9a%84%e8%ae%b0%e5%bf%86%e5%8c%96usecallback-usememo-react-memo%e3%80%90react%e3%80%91%e5%85%b3%e4%ba%8ereact%e4%b8%ad%e7%9a%84\/","title":{"rendered":"\u3010React\u3011\u6709\u5173React\u4e2d\u7684\u8bb0\u5fc6\u5316(useCallback \/ useMemo \/ React.memo)\u3010React\u3011\u5173\u4e8eReact\u4e2d\u7684\u8bb0\u5fc6\u5316(useCallback \/ useMemo \/ React.memo)"},"content":{"rendered":"<p>\u55e8\uff0c\u5927\u5bb6\u597d\uff0c\u6211\u662f@\u3061\u30fc\u305a\u3002<br \/>\n\u4eca\u5929\u662fAdvent Calender\u7b2c\u4e94\u5929\uff0c\u6211\u4eec\u7684\u4e3b\u9898\u662f\u5173\u4e8eReact\u4e2d\u7684\u8bb0\u5fc6\u5316\uff01<\/p>\n<h2>\u4ec0\u4e48\u662f\u8bb0\u5fc6\u5316\uff08\u30e1\u30e2\u5316\uff09\uff1f<\/h2>\n<blockquote><p>\u8fd9\u662f\u4e00\u79cd\u7528\u4e8e\u7a0b\u5e8f\u52a0\u901f\u7684\u4f18\u5316\u6280\u672f\u4e4b\u4e00\uff0c\u5b83\u901a\u8fc7\u4fdd\u5b58\u5b50\u7a0b\u5e8f\u8c03\u7528\u7684\u7ed3\u679c\u4ee5\u4fbf\u4ee5\u540e\u518d\u5229\u7528\uff0c\u4ee5\u9632\u6b62\u6bcf\u6b21\u8c03\u7528\u5b50\u7a0b\u5e8f\uff08\u51fd\u6570\uff09\u65f6\u7684\u91cd\u590d\u8ba1\u7b97\u3002<\/p>\n<p>\u8bb0\u5fc6\u5316\u51fd\u6570\u4f1a\u5c06\u5148\u524d\u8c03\u7528\u65f6\u7684\u7ed3\u679c\u4e0e\u53c2\u6570\u4e00\u8d77\u5b58\u50a8\u8d77\u6765\uff0c\u4ee5\u4fbf\u5728\u4ee5\u540e\u4f7f\u7528\u76f8\u540c\u53c2\u6570\u8c03\u7528\u65f6\uff0c\u4e0d\u9700\u8981\u91cd\u65b0\u8ba1\u7b97\uff0c\u800c\u662f\u8fd4\u56de\u5b58\u50a8\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u53c2\u8003\uff1a\u8bb0\u5fc6\u5316 &#8211; \u7ef4\u57fa\u767e\u79d1<\/p><\/blockquote>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0c\u628a\u8ba1\u7b97\u7ed3\u679c\u8fdb\u884c\u7f13\u5b58\u5e76\u91cd\u65b0\u5229\u7528\uff0c\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u8bb0\u5fc6\u5316\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u9700\u8981\u8fdb\u884c\u5907\u5fd8\u5f55\u8bb0\u5fc6\u5316\uff1f<\/h2>\n<p>\u5728React\u4e2d\uff0c\u7ec4\u4ef6\u4f1a\u5728\u4ee5\u4e0b\u65f6\u673a\u8fdb\u884c\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>state \/ props \u304c\u66f4\u65b0\u3055\u308c\u305f\u6642<\/p>\n<p>\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u305f\u6642<\/p>\n<p>\u5f53\u91cd\u65b0\u6e32\u67d3\u4e00\u4e2a\u7ec4\u4ef6\u65f6\uff0c<br \/>\n\u8be5\u7ec4\u4ef6\u5185\u5b9a\u4e49\u7684\u51fd\u6570\u548c\u53d8\u91cf\u4e5f\u4f1a\u88ab\u91cd\u65b0\u751f\u6210\uff0c<br \/>\n\u5373\u4f7f\u503c\u6ca1\u6709\u6539\u53d8, \u4e5f\u4f1a\u88ab\u91cd\u65b0\u8ba1\u7b97\u3002<\/p>\n<p>\u5982\u679c\u5728React\u4e2d\u6389\u4ee5\u8f7b\u5fc3\uff0c\u90a3\u4e48\u610f\u5916\u7684\u91cd\u65b0\u8ba1\u7b97\u53ef\u80fd\u4f1a\u589e\u52a0\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5f71\u54cd\u7f51\u7ad9\u7684\u6027\u80fd\uff0c\u56e0\u6b64\u8bb0\u5fc6\u5316\u7684\u91cd\u8981\u6027\u5c31\u5f88\u9ad8\u3002<\/p>\n<h2>\u8fdb\u884c\u8bb0\u5fc6\u5316\u65f6\u7684\u6ce8\u610f\u4e8b\u9879<\/h2>\n<p>\u5728\u5904\u7406\u8f7b\u91cf\u7ea7\u4efb\u52a1\u65f6\u8fdb\u884c\u8bb0\u5fc6\u5316\u4f1a\u589e\u52a0\u8bbf\u95ee\u7f13\u5b58\u7684\u5f00\u9500\u3002<br \/>\n\u6b64\u5916\uff0c\u8bb0\u5fc6\u5316\u7684\u5fc5\u8981\u6027\u4e5f\u56e0\u5e94\u7528\u7a0b\u5e8f\u800c\u5f02\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u8ba4\u4e3a\u4e0d\u5e94\u8be5\u5c06\u6240\u6709\u4e8b\u60c5\u90fd\u8bb0\u5fc6\u5316\uff0c\u800c\u662f\u5728\u6267\u884c\u540e\u786e\u8ba4\u6027\u80fd\u662f\u5426\u771f\u6b63\u6539\u5584\uff0c\u7136\u540e\u518d\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u8fd9\u6837\u53ef\u4ee5\u66f4\u597d\u5730\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<p>\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u6211\u4e4b\u524d\u5bf9\u4ec0\u4e48\u4e8b\u60c5\u90fd\u8fc7\u4e8e\u4f9d\u8d56\u8bb0\u7b14\u8bb0\u4e86&#8230;\u6211\u8981\u53cd\u7701\u4e00\u4e0b\u3002<\/p>\n<h2>\u901a\u8fc7\u4f7f\u7528 React.memo \u8fdb\u884c\u7ec4\u4ef6\u7684\u8bb0\u5fc6\u5316<\/h2>\n<p>React.memo\u662f\u4e00\u4e2a\u5c06\u7ec4\u4ef6\u8fdb\u884c\u8bb0\u5fc6\u5316\u7684\u9ad8\u9636\u7ec4\u4ef6\uff08HOC\uff09\u3002\u5f53props\u7684\u503c\u6ca1\u6709\u53d8\u5316\u65f6\uff0c\u5b83\u53ef\u4ee5\u963b\u6b62\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<div>\u9ad8\u9636\u7ec4\u4ef6\uff08HOC\uff09\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u5b83\u63a5\u6536\u4e00\u4e2a\u7ec4\u4ef6\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u7ec4\u4ef6\u3002<\/div>\n<h3>\u5982\u4f55\u5199<\/h3>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u7b2c\u4e00\u5f15\u6570: \u95a2\u6570Component<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">heavyComponent<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">memo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n  <span class=\"c1\">\/\/ \u3068\u3066\u3082\u601d\u3044\u51e6\u7406<\/span>\r\n  <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u5b50Component\u3067\u3059<span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\r\n<span class=\"p\">));<\/span>\r\n\r\n<\/code><\/pre>\n<h3>\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u4f7f\u7528\u8fd9\u4e2a\uff1f<\/h3>\n<h4>\u6210\u672c\u9ad8\u6602\u7684\u6e32\u67d3\u7ec4\u4ef6<\/h4>\n<p>\u5982\u679c\u7ec4\u4ef6\u672c\u8eab\u6709\u7e41\u91cd\u7684\u5904\u7406\u4efb\u52a1\uff0c\u901a\u8fc7\u8fdb\u884c\u8bb0\u5fc6\u5316\u53ef\u4ee5\u907f\u514d\u8fdb\u884c\u6e32\u67d3\u3002<\/p>\n<h4>\u67d0\u4e9b\u7ec4\u4ef6\u53ef\u80fd\u4f1a\u9891\u7e41\u91cd\u65b0\u6e32\u67d3\u3002<\/h4>\n<p>\u5982\u679c\u7236\u7ec4\u4ef6\u7684\u53d8\u5316\u7ecf\u5e38\u53d1\u751f\uff0c\u5b50\u7ec4\u4ef6\u6bcf\u6b21\u90fd\u4f1a\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\uff0c\u56e0\u6b64\u5efa\u8bae\u4f7f\u7528React.memo\u6765\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002<\/p>\n<div>\n<p>\u5982\u679cComponent\u7684\u6e32\u67d3\u9891\u7e41\u5730\u4f9d\u8d56\u4e8e\u7236\u7ec4\u4ef6\u7684\u5904\u7406\uff0c\u90a3\u4e48\u53ef\u80fd\u662f\u7ec4\u4ef6\u8bbe\u8ba1\u672c\u8eab\u5b58\u5728\u95ee\u9898\u3002<\/p>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u63a8\u8350\u7684\u505a\u6cd5\u4e0d\u662f\u7b80\u5355\u5730\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u800c\u662f\u91cd\u65b0\u5ba1\u89c6\u8bbe\u8ba1\u540e\u518d\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002<\/p>\n<\/div>\n<h2>\u4f7f\u7528useMemo\u5bf9\u503c\u8fdb\u884c\u8bb0\u5fc6\u5316\u5904\u7406<\/h2>\n<p>useMemo\u662f\u4e00\u4e2a\u94a9\u5b50\uff0c\u53ef\u4ee5\u7528\u4e8e\u5bf9\u6267\u884c\u7ed3\u679c\u6216\u503c\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002<\/p>\n<h3>\u5199\u4f5c\u65b9\u5f0f<\/h3>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u7b2c\u4e00\u5f15\u6570: \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570<\/span>\r\n<span class=\"c1\">\/\/ \u7b2c\u4e8c\u5f15\u6570: \u4f9d\u5b58\u914d\u5217 - \u3053\u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u305f\u6642\u306e\u307f\u518d\u8a08\u7b97<\/span>\r\n\r\n<span class=\"nx\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"kd\">function<\/span><span class=\"p\">(),<\/span> <span class=\"p\">[<\/span><span class=\"nx\">deps<\/span><span class=\"p\">])<\/span>\r\n<\/code><\/pre>\n<h3>\u5728\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\uff1f<\/h3>\n<h4>\u5982\u679c\u8981\u8fdb\u884c\u975e\u5e38\u8017\u8d39\u6210\u672c\u7684\u8ba1\u7b97<\/h4>\n<p>\u9610\u660e\u201c\u975e\u5e38\u6602\u8d35\u201d\u7684\u5b9a\u4e49\u5f88\u56f0\u96be\uff0c\u4f46\u662f\u9605\u8bfb\u4e0b\u9762\u7684\u6587\u7ae0\u540e\uff0c\u6211\u89c9\u5f97\u5728\u8fdb\u884c\u5927\u7ea6100\u6b21\u5faa\u73af\u7684\u6570\u7ec4\u65f6\u4f7f\u7528useMemo\u53ef\u80fd\u6ca1\u6709\u610f\u4e49\u3002<\/p>\n<p>\u53c2\u8003: \u672a\u7ecf\u8fc7\u5907\u5fd8\u5f55\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">500\u56de\u4ee5\u4e0a\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u4e26\u306e\u8907\u96d1\u3055\u306e\u51e6\u7406<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u4f55\u5ea6\u3082\u518d\u30ec\u30f3\u30c0\u30fc\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b<\/ul>\n<p>\u6211\u89c9\u5f97\u8fd9\u53ef\u80fd\u662f\u4e00\u4e2a\u53ef\u4ee5\u6d3e\u4e0a\u7528\u573a\u7684\u65f6\u673a\uff01<\/p>\n<h2>\u4f7f\u7528`useCallback`\u6765\u5bf9\u51fd\u6570\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002<\/h2>\n<p>useCallback\u662f\u4e00\u4e2a\u8fd4\u56de\u8bb0\u5fc6\u5316callback\u51fd\u6570\u7684hooks\u3002<\/p>\n<h3>\u5199\u4f5c\u65b9\u5f0f<\/h3>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u7b2c\u4e00\u5f15\u6570: \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570<\/span>\r\n<span class=\"c1\">\/\/ \u7b2c\u4e8c\u5f15\u6570: \u4f9d\u5b58\u914d\u5217<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">func<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useCallback<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"c1\">\/\/ callback\u95a2\u6570<\/span>\r\n<span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">deps<\/span><span class=\"p\">]);<\/span>\r\n<\/code><\/pre>\n<h3>\u5728\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\uff1f<\/h3>\n<h4>\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\u7684\u81ea\u5b9a\u4e49\u94a9\u5b50<\/h4>\n<p>\u81ea\u5b9a\u4e49\u94a9\u5b50\u662f\u4e3a\u4e86\u5b9a\u4e49\u5177\u6709\u9ad8\u91cd\u7528\u6027\u7684\u94a9\u5b50\uff0c\u4ee5\u4fbf\u5728\u7ec4\u4ef6\u88ab\u8c03\u7528\u65f6\uff0c\u7528\u6237\u7aef\u65e0\u9700\u8003\u8651\u8be5\u51fd\u6570\u662f\u5426\u4f1a\u88ab\u91cd\u65b0\u751f\u6210\u800c\u8fdb\u884c\u8bbe\u8ba1\u3002\u56e0\u6b64\uff0c\u5982\u679c\u81ea\u5b9a\u4e49\u94a9\u5b50\u8fd4\u56de\u51fd\u6570\uff0c\u5219\u57fa\u672c\u4e0a\u5efa\u8bae\u8fdb\u884c\u8bb0\u5fc6\u5316\u5904\u7406\u3002<\/p>\n<p>\u7531\u4e8e\u4f5c\u8005\u5bf9\u4e0b\u9762\u8fd9\u7bc7\u6587\u7ae0\u6df1\u53d7\u611f\u52a8\uff0c\u6240\u4ee5\u5bf9\u4e8e\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u7684\u4eba\uff0c\u5f3a\u70c8\u63a8\u8350\u9605\u8bfb\uff01<\/p>\n<p>\u8bf7\u5c06\u4ee5\u4e0b\u5185\u5bb9\u4ee5\u4e2d\u6587\u8fdb\u884c\u91ca\u4e49\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a<\/p>\n<p>\u53c2\u8003\u5982\u4e0b<\/p>\n<h4>\u5982\u679c\u5c06\u51fd\u6570\u4f20\u9012\u7ed9\u8bb0\u5fc6\u5316\u7684\u7ec4\u4ef6<\/h4>\n<p>\u4ee5\u4e0b\u662f\u5bf9React.memo\u7684\u590d\u4e60\uff0c\u5f53props\u7684\u503c\u76f8\u540c\u65f6\uff0c\u4e0d\u4f1a\u8fdb\u884c\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5982\u679c\u76f4\u63a5\u5c06\u8be5\u51fd\u6570\u4f20\u9012\u7ed9\u88ab\u7f13\u5b58\u7684\u5b50\u7ec4\u4ef6\uff0c\u90a3\u5f53\u7236\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u51fd\u6570\u4f1a\u88ab\u518d\u6b21\u751f\u6210\uff0c\u56e0\u6b64\u65e0\u6cd5\u5224\u65ad\u4e3a\u76f8\u540c\u7684\u503c\uff0c\u5bfc\u81f4\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u4e3a\u4e86\u4fdd\u6301\u51fd\u6570\u7684\u4e00\u81f4\u6027\uff0c\u8bf7\u4f7f\u7528useCallback\u5c06\u5176\u5305\u88f9\u8d77\u6765\uff01<\/p>\n<hr 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