{"id":38511,"date":"2023-07-06T11:29:09","date_gmt":"2022-11-08T19:17:16","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%ad%a3%e7%a1%ae%e7%90%86%e8%a7%a3%e5%b9%b6%e8%bf%90%e7%94%a8useeffect\/"},"modified":"2024-04-30T12:15:40","modified_gmt":"2024-04-30T04:15:40","slug":"%e6%ad%a3%e7%a1%ae%e7%90%86%e8%a7%a3%e5%b9%b6%e8%bf%90%e7%94%a8useeffect","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%ad%a3%e7%a1%ae%e7%90%86%e8%a7%a3%e5%b9%b6%e8%bf%90%e7%94%a8useeffect\/","title":{"rendered":"\u6b63\u786e\u7406\u89e3\u5e76\u8fd0\u7528useEffect"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<h2>\u4e3a\u4e86\u4e86\u89e3\u8fd9\u7bc7\u6587\u7ae0\u7684\u80cc\u666f<\/h2>\n<p>\u6211\u7b2c\u4e00\u6b21\u63a5\u89e6\u5230\u7f16\u7a0b\u5e76\u4e3b\u52a8\u53bb\u5b66\u4e60\u7684\u662f\u5728\u4f7f\u7528React\u65f6\u3002\u5f53\u65f6\u6211\u53ea\u662f\u4e13\u6ce8\u4e8e\u521b\u5efa\u80fd\u591f\u6b63\u5e38\u8fd0\u884c\u7684\u4e1c\u897f\uff0c\u6240\u4ee5\u52c9\u5f3a\u80fd\u591f\u4f7f\u7528useEffect\uff0c\u4f46\u5e76\u6ca1\u6709\u771f\u6b63\u7406\u89e3\u5b83\uff0c\u5c31\u4e00\u76f4\u8fd9\u6837\u8fdb\u884c\u4e0b\u6765\u3002\u4e3a\u4e86\u4e0d\u5728\u5de5\u4f5c\u4e2d\u5403\u82e6\u5934\uff0c\u6211\u51b3\u5b9a\u91cd\u65b0\u7cfb\u7edf\u5730\u5b66\u4e60\u4e00\u904d\u3002<\/p>\n<h2>\u4e3a\u4e86\u4ec0\u4e48<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">useEffect \u3092\u3044\u307e\u3060\u306b\u306a\u3093\u3068\u306a\u304f\u3067\u4f7f\u3063\u3066\u3044\u308b\u306e\u3067\u7406\u89e3\u3092\u6df1\u3081\u305f\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">useEffect \u3092\u4f7f\u3044\u3053\u306a\u3057\u3066\u30d0\u30b0\u306e\u306a\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u305f\u3044<\/ul>\n<h1>\u6211\u4e0d\u660e\u767d\u7684\u4e8b\u60c5 (w\u01d2 b\u00f9 de<\/h1>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u305d\u3082\u305d\u3082\u4f55\u3092\u3057\u3066\u3044\u308b\u306e\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\">\u526f\u4f5c\u7528<\/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\">\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb<\/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\">useEffect \u306f\u3044\u3064\u5b9f\u884c\u3055\u308c\u308b\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\">\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7<\/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\">dependencies(\u7b2c\u4e8c\u5f15\u6570)\u306b\u4f55\u3092\u5165\u308c\u308c\u3070\u3044\u304b\u308f\u304b\u3089\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>eslint-plugin-react-hooks\u306b\u8133\u6b7b\u3067\u3057\u305f\u304c\u3063\u3066\u3044\u305f<\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u89e3\u7b54\u8fd9\u4e9b\u95ee\u9898\u5427\uff01<\/p>\n<h2>\u9996\u5148\u4f60\u5728\u505a\u4ec0\u4e48\u5462\uff1f<\/h2>\n<p>\u9996\u5148\u9700\u8981\u53c2\u8003\u7684\u662fReact\u7684\u5b98\u65b9\u6587\u6863\u3002<\/p>\n<blockquote><p>\u5728\u51fd\u6570\u7ec4\u4ef6\u5185\u53ef\u4ee5\u6267\u884c\u526f\u4f5c\u7528<\/p><\/blockquote>\n<p>\u5173\u4e8e\u526f\u4f5c\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\u5c06\u5728\u540e\u9762\u63d0\u53ca\uff0c\u4f46\u901a\u8fc7\u4f7f\u7528useEffect\uff0c\u60a8\u53ef\u4ee5\u6267\u884c\u7ec4\u4ef6\u6e32\u67d3\u540e\u7684\u5404\u79cd\u7c7b\u578b\u7684\u526f\u4f5c\u7528\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u4f7f\u7528useEffect\u53ef\u4ee5\u544a\u8bc9React\u5728\u6e32\u67d3\u540e\u9700\u8981\u6267\u884c\u67d0\u4e9b\u5904\u7406\u3002<\/p>\n<blockquote><p>\u51fd\u6570\u7ec4\u4ef6\u662f\u4e00\u79cd\u7528JavaScript\u51fd\u6570\u8bed\u6cd5\u6765\u8868\u793aReact\u7ec4\u4ef6\u7684\u65b9\u6cd5\u3002\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u7c7b\u7ec4\u4ef6\uff0c\u4f46\u6211\u53ea\u7528\u51fd\u6570\u7ec4\u4ef6\u7f16\u5199\u8fc7\u3002<br \/>\nuseEffect\u662f\u4e00\u79cd\u53ef\u4ee5\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u7684React\u94a9\u5b50\u4e4b\u4e00\u3002<br \/>\n\u5728\u7c7b\u7ec4\u4ef6\u4e2d\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u7ec4\u4ef6\u53ea\u80fd\u5199\u4e00\u4e2a\u526f\u4f5c\u7528\u4ee3\u7801\uff0c\u6bd4\u5982componentDidMount\uff0ccomponentDidUpdate\uff0c\u65e0\u6cd5\u5206\u79bb\u5173\u6ce8\u70b9\u3002\u800c\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u5199\u591a\u4e2auseEffect\uff0c\u56e0\u6b64\u66f4\u5bb9\u6613\u5206\u79bb\u5173\u6ce8\u70b9\u3002<\/p><\/blockquote>\n<p>\u8be6\u7ec6\u5730\u8bf4\uff0c\u6211\u4eec\u57fa\u672c\u4e0a\u662f\u6309\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f7f\u7528 useState \u7684 set \u51fd\u6570\u7b49\u6765\u4fee\u6539\u51fd\u6570\u7684\u503c<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4fee\u6539 DOM<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u91cd\u65b0\u6e32\u67d3\u5c4f\u5e55<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5728\u6e32\u67d3\u540e\u6267\u884c useEffect \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e2d\u4f20\u9012\u7684\u5904\u7406\u51fd\u6570<\/ol>\n<pre class=\"post-pre\"><code><span class=\"nx\">\u88dc\u8db3<\/span>\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\">\/\/ \u4f55\u3089\u304b\u306e\u51e6\u7406  <\/span>\r\n<span class=\"p\">}<\/span> <span class=\"p\">,[<\/span><span class=\"nx\">dependencies<\/span><span class=\"p\">])<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">  \r\n\u306b\u304a\u3051\u308b  \r\n <\/span><span class=\"dl\">\"<\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>  \r\n  <span class=\"c1\">\/\/ \u4f55\u3089\u304b\u306e\u51e6\u7406  <\/span>\r\n<span class=\"err\">\u3000<\/span><span class=\"p\">}<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">  \r\n\u306e\u7b87\u6240\u304c\u7b2c\u4e00\u5f15\u6570\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3067\u3059\u3002\r\n<\/span><\/code><\/pre>\n<h2>\u4e0d\u826f\u53cd\u5e94<\/h2>\n<p>\u5728\u7f16\u7a0b\u4e2d\uff0c\u201c\u526f\u4f5c\u7528\u201d\u662f\u6307\u67d0\u4e2a\u529f\u80fd\u5728\u7a0b\u5e8f\u4e0a\u6539\u53d8\u6570\u636e\uff0c\u4ece\u800c\u5f71\u54cd\u5230\u540e\u7eed\u8fd0\u7b97\u7684\u7ed3\u679c\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u6570\u5b66\u51fd\u6570\u539f\u672c\u7684\u76ee\u7684\u662f\u8fd4\u56de\u8ba1\u7b97\u7ed3\u679c\uff0c\u4f46\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u4f1a\u6539\u53d8\u5468\u56f4\u7684\u72b6\u6001\u3002<br \/>\n\u5b83\u4e0e\u201c\u5403\u4e86\u836f\u4f1a\u611f\u5230\u56f0\u5026\u201d\u8fd9\u6837\u7684\u526f\u4f5c\u7528\u6709\u7740\u4e0d\u540c\u7684\u610f\u601d\u3002<br \/>\n\u5e76\u4e0d\u4e00\u5b9a\u5e26\u6765\u4e0d\u826f\u5f71\u54cd\uff0c\u91cd\u8981\u7684\u662f\u5c06\u5176\u653e\u7f6e\u5728\u9002\u5f53\u7684\u4f4d\u7f6e\u3002<\/p>\n<p>\u6211\u6765\u4e3e\u4f8b\u8bf4\u660e\u4e00\u4e0b\u6ca1\u6709\u526f\u4f5c\u7528\u7684\u51fd\u6570\u548c\u6709\u526f\u4f5c\u7528\u7684\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">function<\/span> <span class=\"nf\">double<\/span><span class=\"p\">(<\/span><span class=\"nx\">x<\/span><span class=\"p\">:<\/span> <span class=\"kr\">number<\/span><span class=\"p\">)<\/span> <span class=\"p\">:<\/span><span class=\"kr\">number<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">return<\/span> <span class=\"mi\">2<\/span> <span class=\"o\">*<\/span> <span class=\"nx\">x<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">let<\/span> <span class=\"nx\">num<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span>\r\n<span class=\"c1\">\/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570num\u3092\u53c2\u7167\u3057\u3001\u305d\u308c\u3092\u5897\u52a0\u3055\u305b\u3066\u8fd4\u3059\u95a2\u6570<\/span>\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">add<\/span><span class=\"p\">(<\/span><span class=\"nx\">x<\/span><span class=\"p\">:<\/span> <span class=\"kr\">number<\/span><span class=\"p\">):<\/span> <span class=\"k\">void<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"nx\">num<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">num<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">x<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5177\u6709\u65e0\u526f\u4f5c\u7528\u7684\u51fd\u6570\u5177\u6709\u5f15\u7528\u900f\u660e\u6027\u3002<\/p>\n<blockquote><p>\u6839\u636e\u900f\u660e\u5ea6\u53c2\u8003\uff1a<br \/>\n&#8211; \u5728\u76f8\u540c\u6761\u4ef6\u4e0b\uff0c\u7ed3\u679c\u5c06\u662f\u76f8\u540c\u7684<br \/>\n&#8211; \u5b83\u4e0d\u4f1a\u5bf9\u4efb\u4f55\u5176\u4ed6\u529f\u80fd\u7684\u7ed3\u679c\u4ea7\u751f\u5f71\u54cd<\/p><\/blockquote>\n<p>\u53ea\u8981\u662f\u6709\u526f\u4f5c\u7528\u7684\u51fd\u6570\uff0c\u5c31\u6ca1\u6709\u53c2\u7167\u900f\u660e\u6027\uff0c\u4f1a\u6539\u53d8\u51fd\u6570\u5916\u90e8\u7684\u72b6\u6001\u3002\u4e0a\u9762\u7684add\u51fd\u6570\u6bcf\u6b21\u6267\u884c\u90fd\u4f1a\u4ea7\u751f\u4e0d\u540c\u7684\u7ed3\u679c\uff0c\u6240\u4ee5\u53ef\u4ee5\u8bf4\u5b83\u6709\u526f\u4f5c\u7528\u3002<\/p>\n<p>\u8fd9\u662f\u5173\u4e8e\u7f16\u7a0b\u4e2d\u7684\u526f\u4f5c\u7528\u3002\u6211\u5c06\u63d0\u5230\u524d\u7aef\u65b9\u9762\u7684\u5177\u4f53\u8bdd\u9898\u3002<\/p>\n<p>\u5728 React \u4e2d\uff0c\u526f\u4f5c\u7528\u6307\u7684\u662f\u901a\u8fc7\u67d0\u4e9b\u64cd\u4f5c\u7ed3\u679c\uff0c\u5bfc\u81f4 DOM \u88ab\u4fee\u6539\u5e76\u89e6\u53d1\u91cd\u65b0\u6e32\u67d3\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a\u5f53\u6309\u4e0b\u6309\u94ae\u65f6\uff0c\u8ba1\u6570\u7684\u503c\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u5e76\u4e14\u5c4f\u5e55\u4e0a\u663e\u793a\u7684\u6570\u5b57\u4e5f\u4f1a\u6539\u53d8\u7684\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Counter<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/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=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">handleClick<\/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\">prevCount<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">prevCount<\/span> <span class=\"o\">+<\/span><span class=\"mi\">1<\/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=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"nx\">\u30ab\u30a6\u30f3\u30c8\u306f<\/span><span class=\"p\">{<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"nx\">\u3067\u3059<\/span><span class=\"err\">\u3002<\/span>\r\n      <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\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">handleClick<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;+&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u6309\u4e0b\u6309\u94ae\uff0chandleClick\u51fd\u6570\u5c06\u88ab\u6267\u884c\uff0ccount\u7684\u503c\u5c06\u6539\u53d8\uff0cDOM\u5c06\u88ab\u91cd\u65b0\u7f16\u5199\u5e76\u91cd\u65b0\u6e32\u67d3\u3002<br \/>\nhandleClick\u662f\u4e00\u4e2a\u6709\u526f\u4f5c\u7528\u7684\u51fd\u6570\u3002<\/p>\n<blockquote><p>\u54cd\u5e94\u5f0f\u7f16\u7a0b<br \/>\nReact \u6700\u521d\u662f\u6839\u636e\u4f20\u9012\u7ed9\u7ec4\u4ef6\u7684\u53c2\u6570\u6765\u64cd\u4f5c\u865a\u62df DOM\uff0c\u5e76\u901a\u8fc7\u4f20\u9012\u7684\u5904\u7406\u5668\u6765\u66f4\u65b0\u72b6\u6001\u7684\u60f3\u6cd5\u800c\u521b\u5efa\u7684\uff0c\u6b63\u56e0\u4e3a\u8fd9\u6b63\u662f\u54cd\u5e94\u5f0f\u7f16\u7a0b\uff0c\u6240\u4ee5\u624d\u88ab\u79f0\u4e3a React\u3002<br \/>\n\u5b83\u662f\u4e00\u4e2a\u7ed3\u6784\uff0c\u53ef\u4ee5\u901a\u8fc7\u67d0\u4e2a\u7ec4\u4ef6\u7684\u53c2\u6570\u6216\u4e8b\u4ef6\u6765\u6539\u53d8\u5176\u4ed6\u72b6\u6001\u3002<\/p><\/blockquote>\n<h2>\u751f\u547d\u5468\u671f<\/h2>\n<p>\u5728React\u4e2d\uff0c\u751f\u547d\u5468\u671f\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u4e09\u4e2a\u9636\u6bb5\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Mounting<\/ul>\n<\/li>\n<\/ul>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u751f\u6210\u3055\u308c\u3066\u3001\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u307e\u3067\u306e\u671f\u9593<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Updating<\/ul>\n<\/li>\n<\/ul>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u7ba1\u7406\u3059\u308b\u30c7\u30fc\u30bf\u304c\u30e6\u30fc\u30b6\u30fc\u306b\u3088\u3063\u3066\u66f4\u65b0\u3055\u308c\u308b\u671f\u9593<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Unmounting<\/ul>\n<\/li>\n<\/ul>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u4e0d\u8981\u3068\u306a\u308a\u3001\u7834\u68c4\u3059\u308b\u305f\u3081\u306e\u671f\u9593<\/p>\n<p>\u8fd9\u79cd\u6302\u8f7d\u5904\u7406\u548c\u5378\u8f7d\u5904\u7406\u7684\u5faa\u73af\u88ab\u79f0\u4e3a\u751f\u547d\u5468\u671f\u3002React\u7ec4\u4ef6\u5728\u6bcf\u4e2a\u65f6\u673a\u88ab\u6e32\u67d3\u3002<\/p>\n<h2>useEffect\u4f1a\u5728\u4ec0\u4e48\u65f6\u5019\u88ab\u6267\u884c\uff1f<\/h2>\n<p>useEffect \u7684\u6267\u884c\u65f6\u673a\u53d6\u51b3\u4e8e\u5176\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7684\u6307\u5b9a\u3002<\/p>\n<p>\u7b2c\u4e8c\u5f15\u6570\u306b\u4f55\u3082\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408<br \/>\n\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0(Mounting, Updating, Unmounting)\u6bce\u306b\u5b9f\u884c\u3057\u307e\u3059\u3002<br \/>\n\u3064\u307e\u308a\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067\u5024\u304c\u5909\u308f\u308a\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u3088\u3046\u306a\u5834\u5408\u306b\u306f\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6bce\u306b\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<p>\u7b2c\u4e8c\u5f15\u6570\u306b\u7a7a\u306e\u914d\u5217\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408<br \/>\n\u521d\u56de\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6642\u306e\u307f\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u7b2c\u4e8c\u5f15\u6570\u306e\u914d\u5217\u306b 1 \u3064\u4ee5\u4e0a\u306e\u5024\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408<br \/>\n\u6e21\u3055\u308c\u305f\u5024\u304c\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u524d\u5f8c\u3067\u5909\u66f4\u304c\u306a\u3051\u308c\u3070\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\u3057\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u5f8c\u306b\u5909\u66f4\u3057\u3066\u3044\u308c\u3070\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<p>\u6211\u6765\u770b\u4e00\u4e0b\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Counter<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/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=\"nf\">useState<\/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\">isOpen<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setIsOpen<\/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>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">countUp<\/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\">prevCount<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">prevCount<\/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\">\/\/ useEffect_1<\/span>\r\n  <span class=\"nf\">useEffect<\/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\">\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u305f\u3073\u5b9f\u884c<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">});<\/span>\r\n  <span class=\"c1\">\/\/ useEffect_2<\/span>\r\n  <span class=\"nf\">useEffect<\/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\">\u521d\u56de\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6642\u306e\u307f\u5b9f\u884c<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">},[])<\/span>\r\n  <span class=\"c1\">\/\/ useEffect_3<\/span>\r\n  <span class=\"nf\">useEffect<\/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\">count\u306e\u5024\u304c\u5909\u308f\u308b\u305f\u3073\u5b9f\u884c<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/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=\"p\">{<\/span><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\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\">countUp<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;+&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\">count<\/span><span class=\"p\">:<\/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=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setIsOpen<\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"nx\">isOpen<\/span><span class=\"p\">)}<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"p\">{<\/span><span class=\"nx\">isOpen<\/span> <span class=\"p\">?<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">close<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">open<\/span><span class=\"dl\">\"<\/span><span class=\"p\">}<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/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\/657d34c437434c4406c69ff1\/41-0.gif\" alt=\"useEffectDemo.gif\" \/><\/div>\n<p>\u5f53\u6539\u53d8count\u7684\u503c\u65f6\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u901a\u8fc7\u70b9\u51fb\u300c+\u6309\u94ae\u300d\u6765\u8c03\u7528countUp\u51fd\u6570<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>count\u7684\u503c\u4f1a\u6539\u53d8<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u91cd\u65b0\u6e32\u67d3<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u91cd\u65b0\u6e32\u67d3\u540e\u4f1a\u8c03\u7528useEffect_1<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u7531\u4e8e\u6e32\u67d3\u524d\u548c\u6e32\u67d3\u540ecount\u7684\u503c\u4e0d\u540c\uff0c\u6240\u4ee5\u4f1a\u8c03\u7528useEffect_3<\/ol>\n<p>\u5f53\u6539\u53d8isOpen\u7684\u503c\u65f6\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u901a\u8fc7\u70b9\u51fb\u6253\u5f00\u6216\u5173\u95ed\u6309\u94ae\u6765\u8c03\u7528handleToggle\u51fd\u6570<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>isOpen\u7684\u503c\u5c06\u53d1\u751f\u53d8\u5316<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u91cd\u65b0\u6e32\u67d3<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u91cd\u65b0\u6e32\u67d3\u540e\u8c03\u7528useEffect_1<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u7531\u4e8e\u6e32\u67d3\u540e\u548c\u91cd\u65b0\u6e32\u67d3\u540ecount\u7684\u503c\u662f\u76f8\u540c\u7684\uff0c\u6240\u4ee5\u8df3\u8fc7useEffect_3<\/ol>\n<h2>\u6e05\u7406<\/h2>\n<p>\u5982\u679c\u60f3\u8981\u8bbe\u7f6e\u5bf9\u67d0\u4e9b\u5916\u90e8\u6570\u636e\u6e90\u7684\u8ba2\u9605\uff0c\u6216\u8005\u4f7f\u7528\u8bf8\u5982setTimeout\u51fd\u6570\u7b49\u8ba1\u65f6\u5668\u51fd\u6570\u7684\u8bdd\uff0c\u5c31\u9700\u8981\u8fdb\u884c\u6e05\u7406\u4ee5\u9632\u6b62\u5185\u5b58\u6cc4\u6f0f\u53d1\u751f\u3002<\/p>\n<p>\u5728 `useEffect` \u4e2d\uff0c\u901a\u8fc7\u5728\u526f\u4f5c\u7528\u51fd\u6570\u5185\u8fd4\u56de\u6e05\u9664\u51fd\u6570\uff0c\u53ef\u4ee5\u5728\u7ec4\u4ef6\u6302\u8f7d\u65f6\u6267\u884c\u64cd\u4f5c\uff0c\u5e76\u4e14\u80fd\u591f\u5728\u540e\u7eed\u7684\u91cd\u65b0\u6e32\u67d3\u65f6\u6e05\u9664\u4e0a\u4e00\u6b21\u7684\u526f\u4f5c\u7528\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u901a\u8fc7\u67e5\u770b\u793a\u4f8b\u4ee3\u7801\u6765\u7406\u89e3\u4e3a\u4ec0\u4e48\u9700\u8981\u8fdb\u884c\u6e05\u7406\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Timer<\/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=\"p\">{<\/span>\r\n  <span class=\"na\">setIsDisplay<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"na\">value<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">SetStateAction<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">boolean<\/span><span class=\"o\">&gt;<\/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><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">setIsDisplay<\/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=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">);<\/span>\r\n\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=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u518d\u30ec\u30f3\u30c0\u30fc<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">count<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">0<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nf\">setIsDisplay<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">);<\/span>\r\n      <span class=\"k\">return<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"nf\">setInterval<\/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\">prev<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">prev<\/span> <span class=\"o\">-<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">},<\/span> <span class=\"mi\">1000<\/span><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\">setIsDisplay<\/span><span class=\"p\">]);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"nx\">\u79d2\u5f8c\u306bunMount\u3057\u307e\u3059<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u5e94\u7528\u7a0b\u5e8f\u7ec4\u4ef6\u53ef\u63a7\u5236\u8ba1\u65f6\u5668\u7ec4\u4ef6\u7684\u663e\u793a\/\u9690\u85cf\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">App<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">FC<\/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\">isDisplay<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setIsDisplay<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">handleToggleDisplay<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setIsDisplay<\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"nx\">isDisplay<\/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=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">span<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"nx\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092<\/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\">handleToggleDisplay<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span>\r\n          <span class=\"p\">{<\/span><span class=\"nx\">isDisplay<\/span> <span class=\"p\">?<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Unmount<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Mount<\/span><span class=\"dl\">\"<\/span><span class=\"p\">}<\/span>\r\n        <span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/span<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"p\">{<\/span><span class=\"nx\">isDisplay<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"o\">&lt;<\/span><span class=\"nx\">Timer<\/span> <span class=\"nx\">setIsDisplay<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">setIsDisplay<\/span><span class=\"p\">}<\/span> <span class=\"sr\">\/&gt;<\/span><span class=\"err\">}\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u6d4f\u89c8\u5668\u4e2d\u8fd0\u884c\u6b64\u4ee3\u7801\u65f6\uff0c\u70b9\u51fb\u201cMount\u201d\u6309\u94ae\u540e\uff0cTimer\u7ec4\u4ef6\u5c06\u88ab\u6302\u8f7d\uff0c\u5e76\u5728\u6e32\u67d3\u540e\u6267\u884cuseEffect\u51fd\u6570\u4e2d\u7684\u5904\u7406\u4ee3\u7801\u3002<br \/>\n\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6bcf\u5f53count\u7684\u503c\u53d1\u751f\u6539\u53d8\u65f6\uff0cuseEffect\u51fd\u6570\u90fd\u4f1a\u88ab\u6267\u884c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0csetTimeout\u51fd\u6570\u4f1a\u88ab\u540c\u65f6\u8c03\u7528\uff0c\u4ece\u800c\u5bfc\u81f4\u7c7b\u4f3c\u5c4f\u5e55\u622a\u56fe\u4e2d\u6bcf\u79d2\u9012\u51cf\u7684count\u6570\u51fa\u73b0\u4e0d\u540c\u7684\u9519\u8bef\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d34c437434c4406c69ff1\/54-0.gif\" alt=\"badTimer.gif\" \/><\/div>\n<p>\u6b64\u5916\uff0c\u60a8\u53ef\u4ee5\u5728\u6d4f\u89c8\u5668\u7684\u5f00\u53d1\u8005\u63a7\u5236\u53f0\u4e2d\u786e\u8ba4\u5230\u5b58\u5728\u5185\u5b58\u6cc4\u6f0f\u7684\u60c5\u51b5\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d34c437434c4406c69ff1\/56-0.jpeg\" alt=\"errorlog.jpeg\" \/><\/div>\n<p>\u8ba9\u6211\u4eec\u5199\u51fa\u4e0d\u4f1a\u4ea7\u751f\u8fd9\u4e9b\u9519\u8bef\u7684\u4ee3\u7801\u5427\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Timer<\/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=\"p\">{<\/span>\r\n  <span class=\"na\">setIsDisplay<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"na\">value<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">SetStateAction<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">boolean<\/span><span class=\"o\">&gt;<\/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><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">setIsDisplay<\/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=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/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=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u518d\u30ec\u30f3\u30c0\u30fc<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">count<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">0<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nf\">setIsDisplay<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">);<\/span>\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\">doInterval<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">setInterval<\/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\">prev<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">prev<\/span> <span class=\"o\">-<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">},<\/span> <span class=\"mi\">1000<\/span><span class=\"p\">);<\/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=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u524d\u56de\u306einterval\u3092\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3057\u307e\u3059<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n      <span class=\"nf\">clearInterval<\/span><span class=\"p\">(<\/span><span class=\"nx\">doInterval<\/span><span class=\"p\">);<\/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\">setIsDisplay<\/span><span class=\"p\">]);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"nx\">\u79d2\u5f8c\u306bunMount\u3057\u307e\u3059<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u53d8\u66f4\u4e2d\uff0c\u6211\u4eec\u5728useEffect\u5185\u6dfb\u52a0\u4e86\u6e05\u7406\u51fd\u6570\u3002<br \/>\n\u5728\u6e05\u7406\u51fd\u6570\u4e2d\uff0c\u5728\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u6211\u4eec\u4f1a\u4e22\u5f03\u4e0a\u4e00\u4e2a setInterval \u51fd\u6570\uff0c\u5e76\u5728\u91cd\u65b0\u6e32\u67d3\u540e\u6267\u884c\u65b0\u7684 setInterval \u51fd\u6570\u3002\u8fd9\u6837\uff0ccount \u6bcf\u79d2\u90fd\u4f1a\u51cf\u5c111\uff0c\u5e76\u4e14\u8fd8\u80fd\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d34c437434c4406c69ff1\/60-0.gif\" alt=\"goodTimer.gif\" \/><\/div>\n<h2>\u4f9d\u8d56\u5173\u7cfb<\/h2>\n<p>\u5982\u679c\u5728 useEffect \u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e2d\u6ca1\u6709\u6307\u5b9a\u6b63\u786e\u7684\u503c\uff0c\u5c06\u4f1a\u5f15\u53d1\u9519\u8bef\u3002\u5176\u4e2d\u4e00\u4e2a\u5e38\u89c1\u7684\u9519\u8bef\u662f\u65e0\u9650\u6e32\u67d3\u3002\u90a3\u4e48\uff0c\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u53d1\u751f\u65e0\u9650\u6e32\u67d3\u5462\uff1f\u5c31\u662f\u5728 useEffect \u5185\u90e8\u7684\u5904\u7406\u4e2d\u5c06\u9700\u8981\u66f4\u6539\u7684\u503c\u6307\u5b9a\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"nf\">useEffect<\/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\">count\u3092\u66f4\u65b0<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"nx\">count<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nf\">setCount<\/span><span class=\"p\">((<\/span><span class=\"nx\">prev<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">prev<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">]);<\/span>\r\n<\/code><\/pre>\n<p>\u70ba\u4ec0\u9ebc\u6703\u51fa\u73fe\u7121\u9650\u6e32\u67d3\u7684\u60c5\u6cc1\u5462\uff1f\u539f\u56e0\u662f\u4e0b\u5217\u76842\u81f34\u6b65\u9a5f\u6703\u4e0d\u65b7\u91cd\u8907\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5728\u521d\u59cb\u6e32\u67d3\u65f6\uff0c\u8c03\u7528 useEffect \u6765\u6539\u53d8 count \u7684\u503c\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7531\u4e8e count \u7684\u503c\u5728\u6e32\u67d3\u4e4b\u524d\u548c\u4e4b\u540e\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u56e0\u6b64\u4f1a\u8c03\u7528 useEffect\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u8c03\u7528 useEffect \u6765\u6539\u53d8 count \u7684\u503c\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u8fdb\u884c\u91cd\u65b0\u6e32\u67d3\u3002<\/ol>\n<p>\u5728useEffect\u5185\u90e8\uff0c\u5e94\u8be5\u907f\u514d\u5c06\u9700\u8981\u6539\u53d8\u7684\u503c\u5305\u542b\u5728\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e2d\u3002<\/p>\n<p>\u5728\u6587\u7ae0\u5f00\u5934\uff0c\u6211\u63d0\u5230\u4e86\u5bf9eslint-plugin-react-hooks\u7684\u4f7f\u7528\u8fc7\u4e8e\u673a\u68b0\u800c\u4e0d\u597d\uff0c\u4f46\u662f\u8fd9\u4e2a\u89c4\u5219\u88abReact\u5b98\u65b9\u6587\u6863\u63a8\u8350\uff0c\u5e76\u4e14\u6211\u4eec\u5fc5\u987b\u4f7f\u7528\u5b83\u3002\u867d\u7136\u8fd9\u4e0d\u4ec5\u4ec5\u9002\u7528\u4e8e\u8fd9\u4e2a\u7279\u5b9a\u7684\u89c4\u5219\uff0c\u4f46\u91cd\u8981\u7684\u662f\u5728\u4e86\u89e3\u539f\u7406\u7684\u57fa\u7840\u4e0a\u4f7f\u7528\u5b83\u3002<\/p>\n<h1>\u6700\u540e<\/h1>\n<p>\u975e\u5e38\u62b1\u6b49\u8ba9\u60a8\u9605\u8bfb\u4e86\u8fd9\u4e48\u957f\u7684\u6587\u672c\uff0c\u611f\u8c22\u60a8\u4e00\u76f4\u8bfb\u5230\u6700\u540e\u3002\u5982\u679c\u6709\u4efb\u4f55\u9519\u8bef\u6216\u8865\u5145\uff0c\u8bf7\u7559\u4e0b\u8bc4\u8bba\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u4e3a\u4e86\u4e86\u89e3\u8fd9\u7bc7\u6587\u7ae0\u7684\u80cc\u666f \u6211\u7b2c\u4e00\u6b21\u63a5\u89e6\u5230\u7f16\u7a0b\u5e76\u4e3b\u52a8\u53bb\u5b66\u4e60\u7684\u662f\u5728\u4f7f\u7528React\u65f6\u3002\u5f53\u65f6\u6211\u53ea\u662f\u4e13\u6ce8\u4e8e\u521b\u5efa\u80fd\u591f\u6b63 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38511","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6b63\u786e\u7406\u89e3\u5e76\u8fd0\u7528useEffect - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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