{"id":37992,"date":"2023-03-10T15:42:05","date_gmt":"2023-12-29T00:08:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react%e6%8a%80%e6%9c%af%e5%89%8d%e7%ab%af%e7%9a%84%e9%97%ae%e9%a2%98%e3%80%82\/"},"modified":"2024-04-29T18:16:29","modified_gmt":"2024-04-29T10:16:29","slug":"react%e6%8a%80%e6%9c%af%e5%89%8d%e7%ab%af%e7%9a%84%e9%97%ae%e9%a2%98%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react%e6%8a%80%e6%9c%af%e5%89%8d%e7%ab%af%e7%9a%84%e9%97%ae%e9%a2%98%e3%80%82\/","title":{"rendered":"React\u6280\u672f\u524d\u7aef\u7684\u95ee\u9898"},"content":{"rendered":"<h2>\u9996\u5148<\/h2>\n<p>\u6211\u57282021\u5e74\u4ee5\u65b0\u4eba\u8eab\u4efd\u52a0\u5165\u4e86\u4e00\u5bb6Web\u5f00\u53d1\u516c\u53f8\uff0c\u62c5\u4efb\u524d\u7aef\u5de5\u7a0b\u5e08\u7684\u804c\u4f4d\uff0c\u73b0\u5728\u5df2\u7ecf\u662f2022\u5e74\u7684\u7b2c\u4e8c\u5e74\u4e86\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\uff0c\u6211\u4e3b\u8981\u4f7f\u7528React\u548cTypeScript\u8fdb\u884c\u524d\u7aef\u5f00\u53d1\u3002<\/p>\n<p>\u8fd9\u6b21\u6211\u5c06\u6c47\u603b\u5728\u73b0\u573a\u88ab\u540e\u8f88\u95ee\u5230\u7684React\u6280\u672f\u95ee\u9898\u3002<\/p>\n<p>\u4e3a\u4e86\u56de\u7b54\u95ee\u9898\uff0c\u6211\u5c06\u6df1\u5165\u89e3\u91ca\u800c\u4e0d\u4ec5\u4ec5\u91c7\u7528\u4e00\u95ee\u4e00\u7b54\u7684\u5f62\u5f0f\u3002<\/p>\n<h2>\u8fd9\u7bc7\u6587\u7ae0\u7684\u53d7\u4f17\u5bf9\u8c61<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u76ee\u6307\u3057\u3066\u3044\u308b\u4eba<\/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\u521d\u5fc3\u8005\u304b\u3089\u4e2d\u7d1a\u8005<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">React\u306e\u8cea\u554f\u3092\u3055\u308c\u305f\u6642\u306b\u3046\u307e\u304f\u8a00\u8a9e\u5316\u3067\u304d\u306a\u3044\u4eba<\/ul>\n<h2>\u8fd9\u7bc7\u6587\u7ae0\u7684\u76ee\u7684\u662f\u4ec0\u4e48\uff1f<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">React\u3067\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u308b\u6280\u8853\u3092\u8a00\u8a9e\u5316\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u4f55\u3068\u306a\u304f\u306e\u7406\u89e3\u304b\u3089\u8131\u5374\u3059\u308b<\/ul>\n<h2>\u62b1\u6b49<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u672c\u8a18\u4e8b\u306f\u9762\u63a5\u7b49\u3067\u805e\u304b\u308c\u308b\u8cea\u554f\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u96c6\u3067\u306f\u3042\u308a\u307e\u305b\u3093<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u73fe\u5834\u3067\u5f8c\u8f29\u306b\u805e\u304b\u308c\u305f\u8cea\u554f\u3092\u6df1\u307c\u3063\u3066\u89e3\u8aac\u3092\u3059\u308b\u30ce\u30ea\u3067\u66f8\u3044\u3066\u307e\u3059<\/ul>\n<h2>React\u94a9\u5b50\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>React\u94a9\u5b50\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u5982\u4e0b\u6240\u8ff0\u3002<\/p>\n<blockquote><p>\u94a9\u5b50\uff08hook\uff09\u662f\u5728React 16.8\u4e2d\u65b0\u589e\u7684\u529f\u80fd\u3002\u60a8\u53ef\u4ee5\u5728\u4e0d\u7f16\u5199\u7c7b\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528React\u7684\u529f\u80fd\uff0c\u5982\u72b6\u6001\u7b49\u3002<\/p><\/blockquote>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8bb2\u89e3React\u94a9\u5b50\u4e2d\u7684useState\u548cuseEffect\u3002<\/p>\n<h3>\u8bf7\u544a\u8bc9\u6211useState\u7684\u4f5c\u7528\u548c\u8fd0\u884c\u65b9\u5f0f\u3002<\/h3>\n<p>useState\u662fReact\u5185\u90e8\u53ef\u7528\u4e8e\u7ba1\u7406\u72b6\u6001\u7684\u94a9\u5b50\u3002<\/p>\n<p>\u5728\u516c\u5f0f\u6587\u4ef6\u4e2d\u7684\u5b9a\u4e49\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<blockquote><p>\u8fd4\u56de\u4e00\u4e2a\u5177\u6709\u72b6\u6001\u548c\u7528\u4e8e\u66f4\u65b0\u8be5\u72b6\u6001\u7684\u51fd\u6570\u3002<br \/>\nsetState\u51fd\u6570\u7528\u4e8e\u66f4\u65b0\u72b6\u6001\u3002\u5b83\u63a5\u6536\u4e00\u4e2a\u65b0\u7684\u72b6\u6001\u503c\uff0c\u5e76\u5b89\u6392\u7ec4\u4ef6\u8fdb\u884c\u91cd\u65b0\u6e32\u67d3\u3002<\/p><\/blockquote>\n<p>\u5bf9\u4e8euseState\u7684\u4f7f\u7528\u6d41\u7a0b\uff0c\u7b80\u8981\u6765\u8bf4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>useState\u53ef\u4ee5\u4e0eReact\u5185\u90e8\u8fdb\u884c\u8fde\u63a5\uff0c\u5e76\u4fdd\u6301\u72b6\u6001\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>useState\u8fd4\u56de\u5f53\u524d\u503c\u4ee5\u53ca\u7528\u4e8e\u66f4\u65b0\u503c\u7684\u51fd\u6570\uff08\u66f4\u65b0\u51fd\u6570\uff09\u3002<\/p>\n<p>\u5f53\u901a\u8fc7\u66f4\u65b0\u51fd\u6570\u5c06\u65b0\u503c\u4f20\u9012\u7ed9useState\u65f6\uff0c\u5b83\u4f1a\u547d\u4ee4React\u91cd\u65b0\u6267\u884c\uff08\u91cd\u65b0\u6e32\u67d3\uff09\u7ec4\u4ef6\u3002<\/p>\n<p>\u6211\u5c06\u5177\u4f53\u4eceReact\u7684\u4ee3\u7801\u4e2d\u8ffd\u8e2a\u6d41\u7a0b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Practice<\/span><span class=\"p\">:<\/span> <span class=\"nx\">NextPage<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setValue<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">string<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u521d\u671f\u5024<\/span><span class=\"dl\">\"<\/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\">setValue<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">state\u3092\u66f4\u65b0\u3057\u307e\u3057\u305f<\/span><span class=\"dl\">\"<\/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\">p<\/span><span class=\"p\">&gt;<\/span><span class=\"si\">{<\/span><span class=\"nx\">value<\/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\">onClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>state\u3092\u66f4\u65b0<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/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<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5728\u9875\u9762\u52a0\u8f7d\u65f6\u8fdb\u884c\u521d\u59cb\u6e32\u67d3\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f7f\u7528useState\u5728React\u4e2d\u7ba1\u7406\u540d\u4e3avalue\u7684\u72b6\u6001\uff08\u6709\u521d\u59cb\u503c\uff09\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5f53\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u65b0\u503c\u4f1a\u4f20\u9012\u7ed9\u66f4\u65b0\u51fd\u6570\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5c06\u66f4\u65b0\u51fd\u6570\u4f20\u9012\u7ed9React\uff0c\u5e76\u91cd\u65b0\u6e32\u67d3React\u7ec4\u4ef6\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5c4f\u5e55\u4f1a\u66f4\u65b0\uff0c\u5e76\u663e\u793a\u4f20\u9012\u7ed9\u5b83\u7684\u65b0\u503c\u3002<\/ol>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/24-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 10.21.13.jpg\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/25-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 10.21.43.jpg\" \/><\/div>\n<h3>\u8bf7\u7ed9\u6211\u89e3\u91ca\u4e00\u4e0b useEffect \u51fd\u6570\u7684\u4f5c\u7528\u548c\u5de5\u4f5c\u539f\u7406\u3002<\/h3>\n<p>useEffect \u53ef\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u4ee5\u4ee5\u4e0b\u65b9\u5f0f\u89e3\u91ca\u3002<\/p>\n<blockquote><p>\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u94a9\u5b50\uff0c\u544a\u8bc9 React \u5728\u6e32\u67d3\u4e4b\u540e\u9700\u8981\u8fdb\u884c\u67d0\u4e9b\u5904\u7406\u3002React \u4f1a\u8bb0\u4f4f\u4f60\u4f20\u9012\u7684\u51fd\u6570\uff08\u6211\u4eec\u79f0\u4e4b\u4e3a\u201c\u526f\u4f5c\u7528\u51fd\u6570\u201d\uff09\uff0c\u5e76\u5728 DOM \u66f4\u65b0\u540e\u8c03\u7528\u5b83\u3002\u5bf9\u4e8e\u8fd9\u4e2a\u526f\u4f5c\u7528\u51fd\u6570\uff0c\u6211\u4eec\u8bbe\u7f6e\u4e86\u6587\u6863\u6807\u9898\uff0c\u4f46\u4e5f\u53ef\u4ee5\u7528\u5b83\u6765\u83b7\u53d6\u6570\u636e\u6216\u8c03\u7528\u5176\u4ed6\u547d\u4ee4\u5f0f\u7684 API\u3002<\/p><\/blockquote>\n<p>\u5f53\u4f7f\u7528 useEffect \u65f6\uff0c\u53ef\u4ee5\u5728\u6e32\u67d3\u7ed3\u679c\u663e\u793a\u5728\u5c4f\u5e55\u4e0a\u540e\u6267\u884c useEffect \u5185\u7684\u526f\u4f5c\u7528\u5904\u7406\u7b49\u64cd\u4f5c\u3002\u603b\u7684\u6765\u8bf4\uff0c\u5f53\u7a0d\u5fae\u89e3\u91ca\u4e00\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528 useEffect \u4ee5\u5b9e\u73b0\u5728\u6e32\u67d3\u7ed3\u679c\u663e\u793a\u5728\u5c4f\u5e55\u4e0a\u4e4b\u540e\u6267\u884c\u5728 useEffect \u5185\u90e8\u5199\u5165\u7684\u526f\u4f5c\u7528\u5904\u7406\u7b49\u64cd\u4f5c\u3002<\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u526f\u4f5c\u7528\u6307\u7684\u662f\u5982\u4e0b\u7684\u5904\u7406\u4e8b\u9879\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">DOM\u306e\u66f8\u304d\u63db\u3048\u64cd\u4f5c<\/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\">\u30b5\u30fc\u30d0\u30fc\u901a\u4fe1(API\u30b3\u30fc\u30eb)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5909\u6570\u306e\u66f8\u304d\u63db\u3048<\/ul>\n<p>useEffect\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u6307\u5b9a\u4e86\u5728\u6e32\u67d3\u65f6\u8981\u6267\u884c\u7684\u51fd\u6570\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u63a7\u5236\u7b2c\u4e00\u4e2a\u53c2\u6570\u51fd\u6570\u6240\u4f9d\u8d56\u7684\u6570\u636e\u3002<\/p>\n<p>\u3010\u5728\u9996\u6b21\u6e32\u67d3\u65f6\uff0c\u5c06\u201cHello World\u201d\u8f93\u51fa\u5230\u65e5\u5fd7\u7684\u5904\u7406\u65b9\u6cd5\u3011<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/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=\"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\">Hello World<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <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;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\u30c6\u30b9\u30c8<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>\u53ea\u8981\u5c06\u7a7a\u6570\u7ec4\u4f5c\u4e3auseEffect\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u9012\u7ed9\u4f9d\u8d56\u6570\u636e\uff0c\u5c31\u53ea\u4f1a\u5728\u9996\u6b21\u6e32\u67d3\u65f6\u6267\u884c\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u7f16\u5199\u7684\u51fd\u6570\u3002<\/p>\n<p>\u8003\u8651\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f9d\u8d56\u6570\u7ec4\u6307\u5b9a\u503c\u7684\u60c5\u51b5.<\/p>\n<p>\u6bcf\u5f53count\u589e\u52a0\u65f6\uff0c\u5c06\u6267\u884cuseEffect\u5185\u90e8\u7684\u5904\u7406\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=\"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=\"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\">addCount<\/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=\"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\">\u30ab\u30a6\u30f3\u30c8\u304c\u5897\u3048\u307e\u3057\u305f<\/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  <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\">addCount<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u30af\u30ea\u30c3\u30af<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><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\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6bcf\u6b21\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u53ef\u4ee5\u786e\u8ba4count\u53c2\u6570\u4f1a\u589e\u52a0\uff0c\u5e76\u4e14\u6839\u636euseEffect\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u6267\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002<\/p>\n<h2>\u5173\u4e8e\u72b6\u6001\u7ba1\u7406\u7684\u66f4\u65b0<\/h2>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u521a\u624d\u4ecb\u7ecd\u7684useState\u5e38\u89c1\u7684\u95ee\u9898\u3002<\/p>\n<h3>\u8981\u5982\u4f55\u66f4\u65b0\u6570\u7ec4\u6216\u5bf9\u8c61\u7684\u72b6\u6001\uff1f<\/h3>\n<p>\u7531\u4e8e\u521d\u5b66\u8005\u5e38\u5e38\u5728\u66f4\u65b0\u6570\u7ec4\u548c\u5bf9\u8c61\u7684\u72b6\u6001\u65f6\u9047\u5230\u56f0\u96be\uff0c\u6240\u4ee5\u4e0b\u9762\u5c06\u8be6\u7ec6\u8bb2\u89e3\u3002<\/p>\n<p>\u6211\u5c06\u6839\u636e\u4e0b\u9762\u7684\u4f8b\u5b50\u8fdb\u884c\u89e3\u91ca\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u914d\u5217\u306efruits\u3068\u3044\u3046state\u3092\u7528\u610f\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u300c\u3076\u3069\u3046\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u304c\u8ffd\u52a0\u3055\u308c\u72b6\u614b\u3092\u66f4\u65b0\u3059\u308b<\/ul>\n<p>\u5982\u679c\u6570\u7ec4\u7684\u66f4\u65b0\u4e0d\u6210\u529f\u7684\u8bdd<\/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=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Practice<\/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\">fruits<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setFruits<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">string<\/span><span class=\"p\">[]<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">([<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u308a\u3093\u3054<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">\u3070\u306a\u306a<\/span><span class=\"dl\">\"<\/span><span class=\"p\">]);<\/span>\r\n  <span class=\"c1\">\/\/ \u914d\u5217\u306e\u6700\u5f8c\u306b\u3076\u3069\u3046\u3092\u8ffd\u52a0\u3059\u308b\u51e6\u7406<\/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=\"nx\">fruits<\/span><span class=\"p\">.<\/span><span class=\"nf\">push<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u3076\u3069\u3046<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nf\">setFruits<\/span><span class=\"p\">(<\/span><span class=\"nx\">fruits<\/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\">p<\/span><span class=\"p\">&gt;<\/span><span class=\"si\">{<\/span><span class=\"nx\">fruits<\/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\">onClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u3076\u3069\u3046\u3092\u8ffd\u52a0<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/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\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u70b9\u51fb\u6309\u94ae\uff0c\u5c4f\u5e55\u4e0a\u663e\u793a\u7684\u503c\u4e5f\u4e0d\u4f1a\u88ab\u66f4\u65b0\u3002<\/p>\n<p>\u53ef\u4ee5\u770b\u5230React\u7ec4\u4ef6\u6ca1\u6709\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/50-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 10.27.44.jpg\" \/><\/div>\n<p>\u5f53\u4f60\u67e5\u770b\u5b98\u65b9\u6587\u6863\u7684useState\u65f6\uff0c\u4f1a\u53d1\u73b0\u5176\u4e2d\u7684\u539f\u56e0\u3002<\/p>\n<blockquote><p>\u5982\u679c\u4f7f\u7528\u5f53\u524d\u503c\u8fdb\u884c\u66f4\u65b0\u65f6\uff0cReact\u4f1a\u907f\u514d\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u548c\u526f\u4f5c\u7528\u7684\u6267\u884c\uff0c\u5e76\u4e14\u4f1a\u901a\u8fc7Object.is\u6bd4\u8f83\u7b97\u6cd5\u6765\u7ed3\u675f\u5904\u7406\u3002<\/p><\/blockquote>\n<p>\u5728\u66f4\u65b0state\u7684\u51fd\u6570\u4e2d\u5199\u7740\uff0c\u901a\u8fc7\u5c06&#8221;\u65b0\u7684state&#8221;\u653e\u5165\u5176\u4e2d\u4ee5\u6267\u884c\u91cd\u65b0\u6e32\u67d3\uff0c\u5e76\u4e14\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u76f4\u63a5\u5c06\u503c\u63a8\u9001\u5230\u73b0\u6709\u7684state\u4e2d\uff0c\u8fd9\u6837\u5c31\u88ab\u5224\u5b9a\u4e3a\u76f8\u540c\u503c\uff0c\u4ece\u800c\u907f\u514d\u4e86\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<pre class=\"post-pre\"><code>  <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=\"c1\">\/\/ \u76f4\u63a5state\u306b\u5024\u3092push\u3057\u3066\u3082\u540c\u3058\u5024\u3068\u691c\u77e5\u3055\u308c\u308b<\/span>\r\n    <span class=\"nx\">fruits<\/span><span class=\"p\">.<\/span><span class=\"nf\">push<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u3076\u3069\u3046<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"c1\">\/\/ \u7d50\u679c\u3001\u66f4\u65b0\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3082\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u8d77\u304d\u306a\u3044<\/span>\r\n    <span class=\"nf\">setFruits<\/span><span class=\"p\">(<\/span><span class=\"nx\">fruits<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u4f7f\u7528\u5c55\u5f00\u8bed\u6cd5\u5c06\u73b0\u6709\u6570\u7ec4\u590d\u5236\u5e76\u4f20\u9012\u7ed9\u66f4\u65b0\u51fd\u6570\uff0c\u4ece\u800c\u89e6\u53d1\u6e32\u67d3\u3002<\/p>\n<p>\u5982\u679c\u6570\u7ec4\u7684\u66f4\u65b0\u6210\u529f<\/p>\n<pre class=\"post-pre\"><code>  <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=\"c1\">\/\/ \u30b9\u30d7\u30ec\u30c3\u30c8\u69cb\u6587\u3067\u65e2\u5b58\u306e\u5024\u3092\u30b3\u30d4\u30fc<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">copy<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[...<\/span><span class=\"nx\">fruits<\/span><span class=\"p\">];<\/span>\r\n    <span class=\"c1\">\/\/ \u30b3\u30d4\u30fc\u306b\u5bfe\u3057\u3066\u5024\u3092\u8ffd\u52a0<\/span>\r\n    <span class=\"nx\">copy<\/span><span class=\"p\">.<\/span><span class=\"nf\">push<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u3076\u3069\u3046<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"c1\">\/\/ \u65e2\u5b58\u306estate\u3068\u306f\u7570\u306a\u308b\u5024(\u65b0\u3057\u3044\u5024)\u304c\u5165\u3063\u3066\u304f\u308b\u306e\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u8d77\u304d\u308b<\/span>\r\n    <span class=\"nf\">setFruits<\/span><span class=\"p\">(<\/span><span class=\"nx\">copy<\/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\/657d31d437434c4406c6024c\/58-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 10.38.32.jpg\" \/><\/div>\n<p>\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u8fd9\u4e2a\u5904\u7406\u4e5f\u53ef\u4ee5\u6309\u7167\u4e0b\u9762\u7684\u65b9\u5f0f\u7f16\u5199\u3002<\/p>\n<pre class=\"post-pre\"><code>  <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\">setFruits<\/span><span class=\"p\">([...<\/span><span class=\"nx\">fruits<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">\u3076\u3069\u3046<\/span><span class=\"dl\">\"<\/span><span class=\"p\">]);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u5e0c\u671b\u60a8\u80fd\u9605\u8bfb\u4e0b\u9762\u7684\u6587\u7ae0\uff0c\u53ef\u4ee5\u66f4\u8be6\u7ec6\u5730\u89e3\u91ca\u5173\u4e8e\u8fd9\u4e2a\u90e8\u5206\u7684\u5185\u5bb9\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u5173\u4e8e\u6570\u7ec4\u548c\u952e\u7684\u95ee\u9898<\/h2>\n<h3>\u5728JSX\u5185\u5faa\u73af\u5904\u7406\u6570\u7ec4\u65f6\uff0c\u4e3a\u4ec0\u4e48\u8981\u6307\u5b9akey\u5462\uff1f<\/h3>\n<p>\u5bf9\u4e8e\u5728JSX\u5185\u90e8\u4f7f\u7528\u6570\u7ec4\u5e76\u4f20\u9012key\u7684\u539f\u56e0\uff0c\u5c06\u4f1a\u8fdb\u884c\u4ee5\u4e0b\u89e3\u91ca\u3002<\/p>\n<p>\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u6a59\u5b50\u5c06\u88ab\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u5f00\u5934\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=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">Fruits<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/fruits<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Practice<\/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\">fruits<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setFruits<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">string<\/span><span class=\"p\">[]<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">([<\/span>\r\n    <span class=\"dl\">\"<\/span><span class=\"s2\">\u308a\u3093\u3054<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"dl\">\"<\/span><span class=\"s2\">\u3070\u306a\u306a<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"dl\">\"<\/span><span class=\"s2\">\u3076\u3069\u3046<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"p\">]);<\/span>\r\n\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=\"kd\">const<\/span> <span class=\"nx\">copy<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[...<\/span><span class=\"nx\">fruits<\/span><span class=\"p\">];<\/span>\r\n    <span class=\"nx\">copy<\/span><span class=\"p\">.<\/span><span class=\"nf\">unshift<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">\u307f\u304b\u3093<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nf\">setFruits<\/span><span class=\"p\">(<\/span><span class=\"nx\">copy<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"si\">{<\/span><span class=\"nx\">fruits<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">i<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span> <span class=\"na\">key<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">i<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n          <span class=\"p\">&lt;<\/span><span class=\"nc\">Fruits<\/span> <span class=\"na\">name<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">i<\/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\">))<\/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=\"nx\">onClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\u307f\u304b\u3093\u3092\u8ffd\u52a0<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/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<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/68-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 11.14.40.jpg\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/69-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 11.14.59.jpg\" \/><\/div>\n<p>\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u5bf9\u4e8e\u6570\u7ec4\u548c\u952e\u7684\u89e3\u91ca\u5982\u4e0b\uff1a<\/p>\n<blockquote><p>Key\u5728React\u4e2d\u7528\u4e8e\u8bc6\u522b\u54ea\u4e9b\u5143\u7d20\u53d1\u751f\u4e86\u53d8\u5316\u3001\u6dfb\u52a0\u6216\u5220\u9664\u3002\u4e3a\u4e86\u7ed9\u6570\u7ec4\u4e2d\u7684\u9879\u76ee\u63d0\u4f9b\u7a33\u5b9a\u7684\u8bc6\u522b\u6027\uff0c\u6bcf\u4e2a\u9879\u76ee\u90fd\u5e94\u8be5\u6709\u4e00\u4e2akey\u3002\u6700\u597d\u7684\u65b9\u6cd5\u662f\u9009\u62e9\u4e00\u4e2a\u80fd\u5728\u5144\u5f1f\u9879\u76ee\u4e4b\u95f4\u552f\u4e00\u6807\u8bc6\u8be5\u9879\u76ee\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3akey\u3002\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u60a8\u5c06\u4f7f\u7528\u6570\u636e\u5185\u7684ID\u4f5c\u4e3akey\u3002<\/p><\/blockquote>\n<p>\u5173\u4e8e\u4e3a\u4ec0\u4e48\u8981\u6307\u5b9a\u4e00\u4e2a\u952e\uff0c\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u8fdb\u884c\u4e86\u4ee5\u4e0b\u89e3\u91ca\uff1a<\/p>\n<blockquote><p>React \u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8e DOM \u8282\u70b9\u7684\u5b50\u8282\u70b9\u8fdb\u884c\u9012\u5f52\u5904\u7406\u65f6\uff0c\u7b80\u5355\u5730\u540c\u65f6\u4ece\u4e24\u4e2a\u5b50\u5143\u7d20\u5217\u8868\u7684\u5f00\u5934\u5f00\u59cb\u5904\u7406\uff0c\u76f4\u5230\u627e\u5230\u5dee\u5f02\uff0c\u7136\u540e\u8fdb\u884c\u66f4\u65b0\u3002<\/p><\/blockquote>\n<p>\u6211\u4f1a\u4f7f\u7528\u56fe\u793a\u6765\u7b80\u660e\u5730\u89e3\u91ca\u8fd9\u4e2a\u90e8\u5206\u3002<\/p>\n<p>React\u4f1a\u68c0\u6d4bReact\u5143\u7d20\u6811\u7684\u5dee\u5f02\u5e76\u66f4\u65b0DOM\u3002\u56e0\u6b64\uff0c\u5b83\u4f1a\u6839\u636e\u6e32\u67d3\u65f6\u7684\u5dee\u5f02\u5728\u6d4f\u89c8\u5668\u4e2d\u8fdb\u884c\u53cd\u6620\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/76-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 11.21.39.jpg\" \/><\/div>\n<p>\u5982\u679c\u4e0d\u63d0\u4f9b\u5173\u952ekey\u503c\uff0cReact\u5c06\u89c6\u6240\u6709React\u5143\u7d20\u4f5c\u4e3a\u5dee\u5f02\u5e76\u53cd\u6620\u5230DOM\u4e2d\u3002<\/p>\n<p>\u4ec5\u4ec5\u662f\u5c06&#8221;\u6a59\u5b50&#8221;\u6dfb\u52a0\u5230\u4e86\u6700\u524d\u9762\uff0c\u5374\u5bfc\u81f4\u4e86&#8221;\u82f9\u679c\u3001\u9999\u8549\u3001\u8461\u8404&#8221;\u4f4d\u7f6e\u7684\u53d8\u5316\uff0c\u7ed3\u679c\u6240\u6709\u7684\u90fd\u88ab\u89c6\u4e3a\u5dee\u5f02\u3002<\/p>\n<p>\u901a\u8fc7\u4f20\u9012 key\uff0c\u5373\u4f7f React \u6811\u7684\u4f4d\u7f6e\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u4e5f\u53ea\u4f1a\u8bc6\u522b\u5dee\u5f02\u5e76\u8fdb\u884c\u66f4\u65b0\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/80-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 11.27.45.jpg\" \/><\/div>\n<p>\u5982\u679c\u4e0d\u6307\u5b9a\u5bc6\u94a5\uff0c\u672a\u66f4\u6539\u7684\u5730\u65b9\u4e5f\u4f1a\u88ab\u8ba4\u4e3a\u662f\u5dee\u5f02\uff0c\u4ece\u800c\u964d\u4f4e\u6027\u80fd\u3002<\/p>\n<p>\u5728\u4f7f\u7528key\u6307\u5b9a\u503c\u7684\u60c5\u51b5\u4e0b\uff0c\u63a8\u8350\u4f7f\u7528\u5728\u7d22\u5f15\u4e4b\u4e0a\u80fd\u591f\u552f\u4e00\u6807\u8bc6\u7684\u503c\uff08\u4f8b\u5982ID\uff09\u3002<\/p>\n<p>\u8bf7\u53c2\u8003\u4e0b\u9762\u7684\u6587\u7ae0\uff0c\u4e86\u89e3\u5173\u4e8e\u8fd9\u90e8\u5206\u7684\u539f\u56e0\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u5173\u4e8eDOM\u64cd\u4f5c\u7684\u65b9\u6cd5<\/h2>\n<h3>\u8981\u64cd\u4f5cDOM\uff0c\u8be5\u5982\u4f55\u505a\u5462\uff1f<\/h3>\n<p>\u901a\u8fc7\u4f7f\u7528useRef\uff0c\u53ef\u4ee5\u8fdb\u884cDOM\u64cd\u4f5c\u3002<\/p>\n<p>\u5728\u516c\u5f0f\u6587\u6863\u4e2d\uff0cuseRef\u88ab\u5982\u4e0b\u65b9\u5f0f\u63cf\u8ff0\u3002<\/p>\n<blockquote><p>useRef \u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u521d\u59cb\u5316\u4e3a\u4f20\u9012\u7684\u53c2\u6570\uff08initialValue\uff09\u7684\u53ef\u53d8 ref \u5bf9\u8c61\u3002\u8fd4\u56de\u7684\u5bf9\u8c61\u5c06\u5728\u7ec4\u4ef6\u7684\u6574\u4e2a\u5b58\u5728\u671f\u95f4\u5185\u4fdd\u6301\u5b58\u5728\u3002<br \/>\n\u672c\u8d28\u4e0a\uff0cuseRef\u5c31\u50cf\u4e00\u4e2a\u53ef\u4ee5\u5728.current\u5c5e\u6027\u4e2d\u4fdd\u6301\u53ef\u91cd\u5199\u503c\u7684\u201c\u76d2\u5b50\u201d\u3002<\/p><\/blockquote>\n<p>\u6211\u4f1a\u8fd0\u7528\u5177\u4f53\u7684\u4f8b\u5b50\uff0c\u5e76\u4e14\u7a0d\u5fae\u7b80\u5316\u5730\u8fdb\u884c\u89e3\u91ca\u3002<\/p>\n<p>\u83b7\u53d6JSX\u4e2dinput\u7684\u503c\u5e76\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\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\">useRef<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Practice<\/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=\"nx\">inputRef<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRef<\/span><span class=\"p\">(<\/span><span class=\"kc\">null<\/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=\"nx\">inputRef<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/span> <span class=\"na\">ref<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">inputRef<\/span><span class=\"si\">}<\/span> <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"text\"<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">ref\u3067\u3059<\/span><span class=\"dl\">\"<\/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<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/93-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 13.01.58.jpg\" \/><\/div>\n<p>\u57fa\u4e8e\u8fd9\u4e2a\uff0c\u6211\u5c06\u5199\u51fa\u4ee5\u4e0b\u5904\u7406\u4ee3\u7801\u3002<br \/>\n\u3010\u5728\u70b9\u51fb\u6309\u94ae\u65f6\u5c06\u7126\u70b9\u8bbe\u7f6e\u5230\u8f93\u5165\u8868\u5355\u7684\u5904\u7406\u3011<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Practice<\/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=\"c1\">\/\/ input\u3092\u53d6\u5f97\u3059\u308b\u7528<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">inputRef<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useRef<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">any<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">();<\/span>\r\n  <span class=\"c1\">\/\/ \u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u6642\u306binput\u306b\u30d5\u30a9\u30fc\u30ab\u30b9\u3092\u5408\u308f\u305b\u308b\u95a2\u6570<\/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=\"nx\">inputRef<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span><span class=\"p\">.<\/span><span class=\"nf\">focus<\/span><span class=\"p\">();<\/span>\r\n  <span class=\"p\">};<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&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>\u5165\u529b\u30d5\u30a9\u30fc\u30e0\u306b\u30d5\u30a9\u30fc\u30ab\u30b9<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\">br<\/span><span class=\"p\">&gt;&lt;\/<\/span><span class=\"nt\">br<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/span> <span class=\"na\">ref<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">inputRef<\/span><span class=\"si\">}<\/span> <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"text\"<\/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>\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>\u5f53\u4f60\u5b9e\u9645\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u53ef\u4ee5\u786e\u8ba4\u8f93\u5165\u8868\u5355\u88ab\u805a\u7126\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/97-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-17 13.06.31.jpg\" \/><\/div>\n<p>\u5728\u4f7f\u7528React\u65f6\uff0c&#8221;useRef&#8221;\u548c&#8221;useState&#8221;\u7684\u533a\u522b\u662f<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">useaRef\u306f\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u305a\u306b\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\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\">Ref\u304c\u5909\u66f4\u3057\u3066\u3082\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u306a\u3044(\u4e2d\u306b\u5165\u3063\u3066\u3044\u308b\u30c7\u30fc\u30bf\u306f\u5909\u308f\u3063\u3066\u3044\u308b)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">useRef\u306fDOM\u8981\u7d20\u306bref\u3092\u6e21\u3059\u969b\u306b\u7528\u3044\u3089\u308c\u308b<\/ul>\n<h2>\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u6211\u5c06\u89e3\u91ca\u4e00\u4e0b\u5728\u4f7f\u7528React\u65f6\u9700\u8981\u4e86\u89e3\u7684\u6982\u5ff5\u2014\u2014\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002<\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u5177\u6709\u4ee5\u4e0b\u4e09\u4e2a\u7279\u70b9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u72b6\u614b\u7ba1\u7406\u3068\u51e6\u7406\u306e\u5206\u96e2<\/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\">\u7d14\u7c8b\u95a2\u6570<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u4e0d\u5909\u6027(immutability)<\/ul>\n<p>\u6211\u4f1a\u9010\u4e00\u4ed4\u7ec6\u5730\u67e5\u770b\u3002<\/p>\n<h3>\u72b6\u6001\u7ba1\u7406\u548c\u5904\u7406\u7684\u5206\u79bb<\/h3>\n<p>\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u72b6\u6001\u7ba1\u7406\u548c\u5904\u7406\u88ab\u5206\u7c7b\u548c\u7ba1\u7406\u3002<\/p>\n<p>\u6211\u4f1a\u5177\u4f53\u53c2\u8003React\u7684\u4ee3\u7801\u6765\u786e\u8ba4\u3002<\/p>\n<p>\u6309\u4e0b+1\u6309\u94ae\u540e\uff0ccount\u72b6\u6001\u7684\u503c\u4f1a\u589e\u52a01\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=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Practice<\/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=\"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\">addCount<\/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\">p<\/span><span class=\"p\">&gt;<\/span><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;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">addCount<\/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;\/&gt;<\/span>\r\n  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>React\u5185\u90e8\u7ef4\u62a4\u4e86\u4e00\u4e2a\u540d\u4e3acount\u7684\u72b6\u6001\uff0c\u540c\u65f6\u5c06\u5904\u7406\u51fd\u6570\u7ec4\u4ef6Practice\u8fd4\u56de\u7684JSX\u8fdb\u884c\u5206\u79bb\u3002<\/p>\n<p>\u5728React\u4e2d\uff0c\u72b6\u6001\u7684\u66f4\u65b0\u548c\u7ba1\u7406\u5b8c\u5168\u7531\u5185\u90e8\u8fdb\u884c\uff0c\u4e0e\u51fd\u6570\u7ec4\u4ef6\uff08Practice\uff09\u5206\u79bb\u4e86\u3002<\/p>\n<h3>\u7eaf\u51fd\u6570<\/h3>\n<p>\u6211\u5c06\u8bf4\u660e\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7b2c\u4e8c\u4e2a\u7279\u5f81\uff0c\u5373\u7eaf\u51fd\u6570\u3002<\/p>\n<p>\u7d14\u7cb9\u51fd\u6578\u5177\u5099\u4e0b\u5217\u7279\u9ede\uff1a<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5f15\u6570\u304c\u540c\u3058\u5024\u306a\u3089\u8fd4\u308a\u5024\u306f\u5e38\u306b\u540c\u3058\u5024\u306b\u306a\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\">\u95a2\u6570\u5916\u306e\u72b6\u614b\u306f\u53c2\u7167\u30fb\u66f4\u65b0\u3057\u306a\u3044(\u526f\u4f5c\u7528\u304c\u767a\u751f\u3057\u306a\u3044)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5f15\u6570\u3067\u6e21\u3063\u3066\u304d\u305f\u5024\u3092\u66f4\u65b0\u3057\u306a\u3044<\/ul>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u5c06\u9a8c\u8bc1\u4e0d\u6ee1\u8db3\u4e0a\u8ff0\u6761\u4ef6\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u5982\u679c\u53c2\u8003\u6216\u66f4\u65b0\u4e86\u51fd\u6570\u5916\u7684\u72b6\u6001\uff08\u4ea7\u751f\u4e86\u526f\u4f5c\u7528\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">let<\/span> <span class=\"nx\">count<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><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\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"c1\">\/\/ \u95a2\u6570\u5916\u306e\u5909\u6570\u3092\u66f4\u65b0<\/span>\r\n  <span class=\"nx\">count<\/span><span class=\"o\">++<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span><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\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/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=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"p\">\/&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/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>\u5728Child\u7ec4\u4ef6\u5185\u90e8\uff0c\u5bf9\u5728\u51fd\u6570\u5916\u5b9a\u4e49\u7684\u540d\u4e3avalue\u7684\u53d8\u91cf\u8fdb\u884c\u5f15\u7528\u548c\u66f4\u65b0\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/120-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-18 14.51.45.jpg\" \/><\/div>\n<p>\u5982\u679c\u662f\u7eaf\u51fd\u6570\u7684\u60c5\u51b5\u4e0b<\/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=\"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\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span><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\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/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=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">count<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"mi\">0<\/span><span class=\"si\">}<\/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=\"mi\">1<\/span><span class=\"si\">}<\/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=\"mi\">1<\/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<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/123-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-18 15.02.53.jpg\" \/><\/div>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5728Child\u7ec4\u4ef6\u4e2d\u4f20\u9012\u76f8\u540c\u7684\u53c2\u6570(count)\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u8ba4\u5f97\u5230\u76f8\u540c\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cChild\u7ec4\u4ef6\u53ef\u4ee5\u88ab\u5f52\u7c7b\u4e3a\u7eaf\u51fd\u6570\u3002<\/p>\n<p>\u901a\u8fc7\u5728\u7eaf\u51fd\u6570\u4e2d\u5b9a\u4e49React\u7ec4\u4ef6\uff0c\u53ef\u4ee5\u9632\u6b62\u610f\u5916\u7684\u9519\u8bef\u3002<\/p>\n<h3>\u4e0d\u53d8\u6027 (b\u00f9<\/h3>\n<p>\u4e0d\u53ef\u53d8\u6027\uff08immutability\uff09\u7684\u7279\u70b9\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<ul class=\"post-ul\">\u5f15\u6570\u3067\u6e21\u3055\u308c\u305f\u5024\u306f\u5909\u66f4\u3057\u306a\u3044<\/ul>\n<p>\u5982\u679c\u4e0d\u662f\u4e0d\u53ef\u53d8\u6027\u7684\u8bdd<\/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=\"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=\"c1\">\/\/ \u5f15\u6570\u3067\u6e21\u3063\u3066\u304d\u305f\u5024\u3092\u66f4\u65b0\u3057\u3066\u3044\u308b<\/span>\r\n  <span class=\"nx\">count<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">30<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span><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\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/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=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">count<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"mi\">0<\/span><span class=\"si\">}<\/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=\"mi\">1<\/span><span class=\"si\">}<\/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=\"mi\">2<\/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<p>\u5728Child\u7ec4\u4ef6\u5185\u90e8\uff0c\u6211\u4eec\u901a\u8fc7props\u4f20\u9012\u7684count\u503c\u8fdb\u884c\u4e86\u66f4\u65b0\uff0c\u8fd9\u610f\u5473\u7740\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u51fd\u6570\u4e0d\u518d\u662f\u4e0d\u53ef\u53d8\u6027\u7684\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/133-0.jpeg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-09-18 15.15.24.jpg\" \/><\/div>\n<h3>\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u597d\u5904<\/h3>\n<p>\u5173\u4e8e\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u603b\u7ed3\u662f\uff0c<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u72b6\u614b\u7ba1\u7406\u3068\u51e6\u7406\u3092\u5207\u308a\u96e2\u3059<\/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\">\u7d14\u7c8b\u95a2\u6570\u3067\u526f\u4f5c\u7528\u3092\u6392\u9664\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u4e0d\u5909\u6027<\/ul>\n<p>\u5c06\u4ee3\u7801\u8f6c\u6362\u4e3a\u51fd\u6570\u5f0f\u7f16\u7a0b\u65b9\u5f0f<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u53ef\u8aad\u6027\u304c\u4e0a\u304c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u518d\u5229\u7528\u6027\u304c\u3042\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c6\u30b9\u30c8\u304c\u66f8\u304d\u3084\u3059\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30e2\u30b8\u30e5\u30fc\u30eb\u5316\u3057\u3084\u3059\u3044<\/ul>\n<p>\u53ef\u4ee5\u83b7\u5f97\u8bf8\u5982\u6b64\u7c7b\u7684\u597d\u5904\u3002<\/p>\n<h2>\u6700\u540e<\/h2>\n<p>\u8bf7\u95ee\u60a8\u89c9\u5f97\u5982\u4f55\uff1f<\/p>\n<p>\u8fd9\u6b21\u6211\u4eec\u603b\u7ed3\u4e86\u5173\u4e8eReact\u6280\u672f\u95ee\u9898\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u7531\u4e8e\u5728\u73b0\u573a\u5f00\u53d1\u65f6\uff0c\u5f53\u88ab\u95ee\u5230\u4e00\u4e9b\u6280\u672f\u95ee\u9898\u65f6\u65e0\u6cd5\u5f88\u597d\u5730\u8868\u8fbe\u51fa\u6765\uff0c\u56e0\u6b64\u6211\u51b3\u5b9a\u91cd\u65b0\u6574\u7406\u4e00\u4e0b\u3002<\/p>\n<p>\u56e0\u4e3a\u5b83\u53ea\u662f\u6709\u5173\u57fa\u672c\u5185\u5bb9\u7684\u8bf4\u660e\uff0c\u6240\u4ee5\u4e0b\u4e00\u7bc7\u6587\u7ae0\u4e2d\u6211\u6253\u7b97\u5199\u4e0b\u9762\u8fd9\u6837\u7684\u5185\u5bb9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/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\">\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u72b6\u614b\u7ba1\u7406\u306b\u3064\u3044\u3066<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Next.js\u95a2\u9023<\/ul>\n<p>\u5982\u679c\u4f60\u80fd\u8bfb\u4e00\u4e0b\u6211\u5173\u4e8e\u524d\u7aef\u5f00\u53d1\u7684\u5176\u4ed6\u6587\u7ae0\uff0c\u6211\u4f1a\u5f88\u5f00\u5fc3\u7684\u3002<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u6211\u57282021\u5e74\u4ee5\u65b0\u4eba\u8eab\u4efd\u52a0\u5165\u4e86\u4e00\u5bb6Web\u5f00\u53d1\u516c\u53f8\uff0c\u62c5\u4efb\u524d\u7aef\u5de5\u7a0b\u5e08\u7684\u804c\u4f4d\uff0c\u73b0\u5728\u5df2\u7ecf\u662f2022\u5e74\u7684\u7b2c\u4e8c\u5e74\u4e86\u3002 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-37992","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>React\u6280\u672f\u524d\u7aef\u7684\u95ee\u9898 - 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\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/react\u6280\u672f\u524d\u7aef\u7684\u95ee\u9898\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React\u6280\u672f\u524d\u7aef\u7684\u95ee\u9898\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u6211\u57282021\u5e74\u4ee5\u65b0\u4eba\u8eab\u4efd\u52a0\u5165\u4e86\u4e00\u5bb6Web\u5f00\u53d1\u516c\u53f8\uff0c\u62c5\u4efb\u524d\u7aef\u5de5\u7a0b\u5e08\u7684\u804c\u4f4d\uff0c\u73b0\u5728\u5df2\u7ecf\u662f2022\u5e74\u7684\u7b2c\u4e8c\u5e74\u4e86\u3002 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/react\u6280\u672f\u524d\u7aef\u7684\u95ee\u9898\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-12-29T00:08:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-29T10:16:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d31d437434c4406c6024c\/24-0.jpeg\" \/>\n<meta name=\"author\" content=\"\u9038, \u79d1\" \/>\n<meta name=\"twitter:card\" 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