{"id":38498,"date":"2023-04-11T22:22:16","date_gmt":"2023-03-01T00:15:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%f0%9f%9a%80-%e4%bb%a5%e4%b8%80%e4%b8%aa%e8%89%ba%e6%9c%af%e7%94%bb%e5%bb%8a%e7%9a%84%e6%af%94%e5%96%bb%e6%9d%a5%e8%a7%a3%e9%87%8a-react-%e7%9a%84%e6%8c%82%e8%bd%bd%e5%92%8c%e6%b8%b2%e6%9f%93\/"},"modified":"2024-04-29T23:02:09","modified_gmt":"2024-04-29T15:02:09","slug":"%f0%9f%9a%80-%e4%bb%a5%e4%b8%80%e4%b8%aa%e8%89%ba%e6%9c%af%e7%94%bb%e5%bb%8a%e7%9a%84%e6%af%94%e5%96%bb%e6%9d%a5%e8%a7%a3%e9%87%8a-react-%e7%9a%84%e6%8c%82%e8%bd%bd%e5%92%8c%e6%b8%b2%e6%9f%93","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%f0%9f%9a%80-%e4%bb%a5%e4%b8%80%e4%b8%aa%e8%89%ba%e6%9c%af%e7%94%bb%e5%bb%8a%e7%9a%84%e6%af%94%e5%96%bb%e6%9d%a5%e8%a7%a3%e9%87%8a-react-%e7%9a%84%e6%8c%82%e8%bd%bd%e5%92%8c%e6%b8%b2%e6%9f%93\/","title":{"rendered":"\ud83d\ude80 \u4ee5\u4e00\u4e2a\u827a\u672f\u753b\u5eca\u7684\u6bd4\u55bb\u6765\u89e3\u91ca React \u7684\u6302\u8f7d\u548c\u6e32\u67d3 \ud83d\uddbc\ufe0f \ud83c\udfa8 \ud83d\udd8c\ufe0f \ud83c\udfde\ufe0f"},"content":{"rendered":"<p>\u5728\u5b66\u4e60React\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7406\u89e3&#8221;mount&#8221;\u548c&#8221;render&#8221;\u975e\u5e38\u91cd\u8981\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u827a\u672f\u753b\u5eca\u7684\u7c7b\u6bd4\u6765\u66f4\u76f4\u89c2\u5730\u7406\u89e3\u8fd9\u4e9b\u6982\u5ff5\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>? \u7ed8\u753b\u7684\u827a\u672f\u5bb6 = \u6e32\u67d3\uff1a<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>React\u7ec4\u4ef6\u5c31\u50cf\u827a\u672f\u5bb6\u4e00\u6837\uff0c\u6bcf\u5f53\u6709\u65b0\u7684\u4fe1\u606f\u6216\u53d8\u5316\u65f6\u90fd\u4f1a\u753b\u51fa\u4e00\u5e45\u753b\u4f5c\u3002\u8fd9\u5c31\u662f\u6e32\u67d3\u7684\u8fc7\u7a0b\u3002\u7136\u800c\uff0c\u5e76\u4e0d\u662f\u6240\u6709\u7684\u753b\u4f5c\u90fd\u4f1a\u81ea\u52a8\u6302\u5728\u753b\u5eca\u7684\u5899\u4e0a\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>?\ufe0f \u5c06\u753b\u4f5c\u6302\u5728\u5899\u4e0a = \u6302\u8f7d\uff1a<br \/>\n\u5f53\u7ec4\u4ef6\u7b2c\u4e00\u6b21\u5c06\u753b\u4f5c\u6302\u5728\u753b\u5eca\u7684\u5899\u4e0a\uff08DOM\uff09\u65f6\uff0c\u8fd9\u88ab\u79f0\u4e3a\u201c\u6302\u8f7d\u201d\u3002\u8fd9\u4e2a\u7279\u6b8a\u7684\u65f6\u523b\u53ea\u4f1a\u5728\u7ec4\u4ef6\u7684\u4e00\u751f\u4e2d\u53d1\u751f\u4e00\u6b21\u3002<\/p>\n<p>? \u4ece\u5899\u4e0a\u53d6\u4e0b\u753b\u4f5c = \u5378\u8f7d\uff1a<br \/>\n\u5f53\u5c55\u89c8\u7ed3\u675f\u6216\u51fa\u73b0\u67d0\u79cd\u539f\u56e0\u9700\u8981\u5c06\u753b\u4f5c\u4ece\u5899\u4e0a\u53d6\u4e0b\u65f6\uff0c\u8fd9\u4e2a\u884c\u4e3a\u88ab\u79f0\u4e3a\u201c\u5378\u8f7d\u201d\u3002\u4e00\u65e6\u8fd9\u4e2a\u65f6\u523b\u5230\u6765\uff0c\u753b\u4f5c\u5c06\u518d\u6b21\u4ece\u753b\u5eca\u7684\u5899\u4e0a\u53d6\u4e0b\u3002<\/p>\n<p>\u5982\u679c\u9700\u8981\u5237\u65b0\u753b\u5eca\uff08\u91cd\u65b0\u8f7d\u5165\u9875\u9762\uff09\uff0c\u6240\u6709\u6b63\u5728\u5c55\u51fa\u7684\u753b\u4f5c\u5c06\u5148\u4ece\u5899\u58c1\u4e0a\u53d6\u4e0b\uff0c\u827a\u672f\u5bb6\u5c06\u91cd\u65b0\u7ed8\u5236\u4f5c\u54c1\uff0c\u753b\u5eca\u5de5\u4f5c\u4eba\u5458\u518d\u5c06\u5176\u4f5c\u4e3a\u65b0\u7684\u5c55\u89c8\u88c5\u9970\u5728\u5899\u58c1\u4e0a\u3002<\/p>\n<blockquote><p>\u5173\u4e8eDOM\u548c\u865a\u62dfDOM\uff0c\u8bf7\u67e5\u770b\u8fd9\u91cc\u3002<\/p><\/blockquote>\n<h3>? useEffect\u7684\u5438\u5f15\u529b<\/h3>\n<p>useEffect\u662fReact Hooks\u7684\u4e00\u79cd\uff0c\u7528\u4e8e\u8bbe\u7f6e\u5728\u52a8\u4f5c\u4e4b\u540e\u60f3\u8981\u6267\u884c\u7684\u526f\u4f5c\u7528\u3002\u526f\u4f5c\u7528\u53ef\u4ee5\u5305\u62ec\u6570\u636e\u83b7\u53d6\u3001\u8ba2\u9605\u3001DOM\u4fee\u6539\u7b49\u64cd\u4f5c\uff0c\u5e76\u4e0e\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u76f8\u4e92\u5173\u8054\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useEffect<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">ExampleComponent<\/span><span class=\"p\">()<\/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\r\n  <span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nx\">title<\/span> <span class=\"o\">=<\/span> <span class=\"s2\">`You clicked <\/span><span class=\"p\">${<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"s2\"> times`<\/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=\"s1\">Component will unmount<\/span><span class=\"dl\">'<\/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>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"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=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <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><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n        Click me\r\n      <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\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6bcf\u5f53\u8ba1\u6570\u6539\u53d8\u65f6\uff0cuseEffect\u4ea7\u751f\u7684\u6548\u679c\u4f1a\u89e6\u53d1?\uff01<\/p>\n<h2>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u6709\u5173\u53d6\u6d88\u6302\u8f7d\u7684\u5177\u4f53\u4f8b\u5b50\u3002<\/h2>\n<h3>1. \u901a\u8fc7\u8def\u7531\u8fdb\u884c\u827a\u672f\u753b\u5eca\u623f\u95f4\u7684\u66f4\u6539\u3002<\/h3>\n<p>\u8bf7\u60f3\u4e00\u60f3\uff0c\u5047\u8bbe\u60a8\u6b63\u5728\u4e00\u5bb6\u5927\u578b\u827a\u672f\u9986\u4e2d\uff0c\u51b3\u5b9a\u4ece\u201c\u98ce\u666f\u753b\u623f\u95f4\u201d\u79fb\u52a8\u5230\u201c\u8096\u50cf\u753b\u623f\u95f4\u201d\u3002\u5f53\u60a8\u79fb\u52a8\u540e\uff0c\u539f\u6765\u7684\u201c\u98ce\u666f\u753b\u623f\u95f4\u201d\u4e2d\u7684\u753b\u4f5c?\ufe0f\u5c31\u65e0\u6cd5\u518d\u770b\u89c1\u4e86\uff0c\u53d6\u800c\u4ee3\u4e4b\u7684\u662f\u65b0\u7684\u201c\u8096\u50cf\u753b\u623f\u95f4\u201d\u4e2d\u7684\u753b\u4f5c?\u200d?\u8fdb\u5165\u60a8\u7684\u89c6\u7ebf\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">BrowserRouter<\/span> <span class=\"k\">as<\/span> <span class=\"nx\">Router<\/span><span class=\"p\">,<\/span> <span class=\"nx\">Route<\/span><span class=\"p\">,<\/span> <span class=\"nx\">Link<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react-router-dom<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">App<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nc\">Router<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">Link<\/span> <span class=\"na\">to<\/span><span class=\"p\">=<\/span><span class=\"s\">\"\/\"<\/span><span class=\"p\">&gt;<\/span>Home<span class=\"p\">&lt;\/<\/span><span class=\"nc\">Link<\/span><span class=\"p\">&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">Link<\/span> <span class=\"na\">to<\/span><span class=\"p\">=<\/span><span class=\"s\">\"\/about\"<\/span><span class=\"p\">&gt;<\/span>About<span class=\"p\">&lt;\/<\/span><span class=\"nc\">Link<\/span><span class=\"p\">&gt;<\/span>\r\n\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">Route<\/span> <span class=\"na\">path<\/span><span class=\"p\">=<\/span><span class=\"s\">\"\/\"<\/span> <span class=\"na\">exact<\/span> <span class=\"na\">component<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">Home<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nc\">Route<\/span> <span class=\"na\">path<\/span><span class=\"p\">=<\/span><span class=\"s\">\"\/about\"<\/span> <span class=\"na\">component<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">About<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nc\">Router<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">Home<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">h2<\/span><span class=\"p\">&gt;<\/span>Home<span class=\"p\">&lt;\/<\/span><span class=\"nt\">h2<\/span><span class=\"p\">&gt;;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">About<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">h2<\/span><span class=\"p\">&gt;<\/span>About<span class=\"p\">&lt;\/<\/span><span class=\"nt\">h2<\/span><span class=\"p\">&gt;;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u8fd9\u6bb5React\u4ee3\u7801\u5c31\u50cf\u662f\u5728\u66f4\u6362\u827a\u672f\u753b\u5eca\u7684\u623f\u95f4\u4e00\u6837\u3002\u5f53\u4eceHome\u5207\u6362\u5230About\u65f6\uff0c\u524d\u4e00\u4e2a\u9875\u9762\u7684\u7ec4\u4ef6\uff08\u4ee3\u8868\u753b\u4f5c?\uff09\u5c06\u88ab\u5378\u8f7d\uff0c\u65b0\u9875\u9762\u7684\u7ec4\u4ef6\u5c06\u88ab\u6302\u8f7d\u3002<\/p>\n<h3>2. \u901a\u8fc7\u6761\u4ef6\u6e32\u67d3\u6765\u79fb\u9664\u7ed8\u753b\u4f5c\u54c1<\/h3>\n<p>\u8bf7\u5728\u827a\u672f\u753b\u5eca\u4e2d\u60f3\u8c61\u4e00\u4e0b\uff0c\u6709\u4e00\u4e2a\u7279\u522b\u7684\u5c55\u89c8\u88ab\u5e18\u5b50?\ufe0f\u906e\u76d6\u8d77\u6765\uff0c\u53ea\u4e3a\u90a3\u4e9b\u60f3\u8981\u770b\u7279\u5b9a\u753b\u4f5c\u7684\u5ba2\u4eba\u51c6\u5907\u3002\u5f53\u5ba2\u4eba\u6309\u4e0b\u6309\u94ae?\u65f6\uff0c\u5e18\u5b50\u4f1a\u6253\u5f00\uff0c\u5c55\u73b0\u51fa\u90a3\u5e45\u7279\u522b\u7684\u753b\u4f5c\u3002\u518d\u6b21\u6309\u4e0b\u6309\u94ae\uff0c\u753b\u4f5c\u53c8\u4f1a\u88ab\u9690\u85cf\u8d77\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">App<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">showComponent<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setShowComponent<\/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\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">showComponent<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">MyComponent<\/span> <span class=\"p\">\/&gt;<\/span><span class=\"si\">}<\/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=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setShowComponent<\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"nx\">showComponent<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n        Toggle Component\r\n      <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\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">MyComponent<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">h2<\/span><span class=\"p\">&gt;<\/span>Hello World<span class=\"p\">&lt;\/<\/span><span 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