{"id":38615,"date":"2022-11-03T05:29:02","date_gmt":"2023-05-16T15:18:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react%e5%bc%80%e5%8f%91%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86-jsx%e8%af%ad%e6%b3%95%e3%80%81render%e5%87%bd%e6%95%b0%e7%bc%96%e8%be%91\/"},"modified":"2024-04-28T22:44:29","modified_gmt":"2024-04-28T14:44:29","slug":"react%e5%bc%80%e5%8f%91%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86-jsx%e8%af%ad%e6%b3%95%e3%80%81render%e5%87%bd%e6%95%b0%e7%bc%96%e8%be%91","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react%e5%bc%80%e5%8f%91%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86-jsx%e8%af%ad%e6%b3%95%e3%80%81render%e5%87%bd%e6%95%b0%e7%bc%96%e8%be%91\/","title":{"rendered":"React\u5f00\u53d1\u7b2c\u4e00\u90e8\u5206- JSX\u8bed\u6cd5\u3001render()\u51fd\u6570\u7f16\u8f91"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u65e9\u4e0a\u597d\uff0c\u6211\u662fTun\u3002<br \/>\n\u8fd9\u6b21\u6211\u60f3\u7ee7\u7eed\u4e4b\u524d\u7684\u5185\u5bb9\uff0c\u590d\u4e60\u5e76\u4ecb\u7ecdReact\u7684\u57fa\u7840\u77e5\u8bc6\u3002<\/p>\n<h1>JSX\u8bed\u6cd5\u548crender()\u51fd\u6570\u3002<\/h1>\n<p>\u9996\u5148\u8981\u6ce8\u610f\u7684\u662fJSX\u8bed\u6cd5\uff0c\u5b83\u662fReact\u7684\u57fa\u672c\u5199\u6cd5\u3002\u8fd9\u79cd\u5199\u6cd5\u53ef\u4ee5\u5728JavaScript\u6587\u4ef6\u4e2d\u50cfHTML\u6807\u7b7e\u4e00\u6837\u8fdb\u884c\u7f16\u5199\u3002\u5b98\u65b9\u6587\u6863\u4e2d\u5199\u9053\uff0cJSX\u53ea\u662fReact.createElement(component, props,&#8230;children)\u7684\u8bed\u6cd5\u7cd6\u3002<\/p>\n<p>\u6211\u4eec\u7acb\u5373\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"p\">&lt;<\/span><span class=\"nc\">MyButton<\/span> <span class=\"na\">color<\/span> <span class=\"p\">=<\/span> <span class=\"s\">\"bule\"<\/span> <span class=\"na\">shadowSize<\/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  Click Me\r\n<span class=\"p\">&lt;\/<\/span><span class=\"nc\">MyButton<\/span><span class=\"p\">&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u88ab\u7f16\u8bd1\u6210\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">createElement<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">MyButton<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"p\">{<\/span><span class=\"na\">color<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">bule<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"na\">shadowSize<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span><span class=\"p\">},<\/span>\r\n  <span class=\"dl\">'<\/span><span class=\"s1\">Click Me<\/span><span class=\"dl\">'<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4f7f\u7528React\u8fdb\u884c\u5f00\u53d1\u65f6\uff0c\u6211\u4eec\u4f7f\u7528JSX\u8bed\u6cd5\u8fdb\u884c\u7f16\u5199\uff0c\u4f46\u4e5f\u9700\u8981\u8003\u8651\u5230\u7f16\u8bd1\u540e\u7684\u5199\u6cd5\u3002\u53e6\u5916\uff0cJSX\u8bed\u6cd5\u6709\u4e00\u4e9b\u89c4\u5219\u3002\u8ba9\u6211\u4eec\u6765\u770b\u770b\u4ee5\u4e0b\u7684\u4f8b\u5b50\u3002<br \/>\n\u203b\u9664\u4e86\u4ee5\u4e0b\u8fd9\u4e9b\uff0c\u8fd8\u5047\u8bbe\u5b58\u5728\u4e00\u4e2aindex.html\u6587\u4ef6\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2aid\u4e3aroot\u7684div\u6807\u7b7e\u7684\u5199\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">ReactDOM<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">react-dom<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">App<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">h1<\/span><span class=\"p\">&gt;<\/span>Hello!<span class=\"p\">&lt;\/<\/span><span class=\"nt\">h1<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>How are you?<span class=\"p\">&lt;\/<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">&lt;\/&gt;<\/span>\r\n <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">container<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">getElementById<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">root<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n<span class=\"nx\">ReactDOM<\/span><span class=\"p\">.<\/span><span class=\"nf\">render<\/span><span class=\"p\">(&lt;<\/span><span class=\"nc\">App<\/span> <span class=\"p\">\/&gt;,<\/span> <span class=\"nx\">container<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>react-dom\u304b\u3089ReactDOM\u3068\u3044\u3046\u540d\u524d\u3067\u30e2\u30b8\u30e5\u30fc\u30eb\u3092import\u3059\u308b\u3002<br \/>\n\u95a2\u6570App\u3092\u5b9a\u7fa9\u3057\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u8a18\u8ff0\u3059\u308b<br \/>\nreturn\u3092\u66f8\u304f<br \/>\n\u305d\u306e\u4e2d\u306b\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b(HTML\u306e\u30bf\u30b0\u304c\u4eca\u56de\u306e\u51e6\u7406\u90e8\u5206)<\/p>\n<p>render()\u95a2\u6570\u3092\u7528\u3044\u3066\u3001\u6307\u5b9a\u3057\u305f\u8981\u7d20\u306e\u4e2d\u306eDOM\u306b\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3001\u305d\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059<\/p>\n<p>\u5728\u8fd9\u91cc\uff0creturn\u4e4b\u540e\u7528&lt;&gt;&lt;\/&gt;\u62ec\u8d77\u6765\uff0c\u8fd9\u662fJSX\u8bed\u6cd5\u7684\u89c4\u5219\u3002\u9664\u4e86\u4f7f\u7528div\u6216React\u63d0\u4f9b\u7684Fragment\u4e4b\u5916\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u7a7a\u6807\u7b7e\u6765\u5305\u88f9\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u751f\u6210\u4e0d\u5fc5\u8981\u7684DOM\u3002<br \/>\n\u6b64\u5916\uff0c\u7528&lt;&gt;\u62ec\u8d77\u6765\u7684App\u662f\u4e3a\u4e86\u5c06\u5176\u4f5c\u4e3a\u7ec4\u4ef6\u5904\u7406\u3002<\/p>\n<p>\u5173\u4e8erender()\u51fd\u6570\u7684\u6df1\u5165\u6316\u6398\uff1a<br \/>\n\u5b98\u65b9\u6587\u4ef6\u4e2d\u6709\u4ee5\u4e0b\u63cf\u8ff0\u3002<\/p>\n<blockquote><p>\u89e6\u53d1\u6e32\u67d3<br \/>\n\u6e32\u67d3\u7ec4\u4ef6<br \/>\n\u63d0\u4ea4\u81f3 DOM<\/p><\/blockquote>\n<p>ReactDOM.render()\u51fd\u6570\u662f\u901a\u8fc7\u4eceReactDOM (react-dom\u6a21\u5757)\u4e2d\u8fdb\u884c\u5bfc\u5165\u4f7f\u7528\u7684\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1arender(element, container[, callback])\u3002<\/p>\n<p>\u4e0a\u8ff0\u7684\u4ee3\u7801\u662f\u6839\u636e\u89e6\u53d1\u6e32\u67d3\uff0c\u5c06\u7ec4\u4ef6\u6e32\u67d3\u5230\u5c4f\u5e55\u4e0a\uff0c\u5e76\u63d0\u4ea4\u5230DOM\u4e2d\u7684\u6d41\u7a0b\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5173\u4e8erender()\u51fd\u6570\u7684\u4f5c\u7528\uff0c\u6211\u7406\u89e3\u4e3a\u662f\u7528\u4e8e\u5224\u65ad\u6e32\u67d3\u7ed3\u679c\u662f\u5426\u6709\u5dee\u5f02\uff0c\u4ece\u800c\u68c0\u6d4b\u5f7c\u6b64\u4e4b\u95f4\u7684\u5dee\u5f02\u3002<\/p>\n<p>\u4f46\u662f\uff01\uff01\uff01\uff01<\/p>\n<p>\u65f6\u4ee3\u7684\u53d8\u8fc1\u603b\u662f\u8fc5\u731b\u7684\uff0c\u81ea\u4ece\u8d2d\u4e70\u8fd9\u672c\u4e66\u5230\u73b0\u5728\uff0cReact\u5df2\u7ecf\u5347\u7ea7\u5230v18\uff0c\u5e76\u4e14ReactDOM.render()\u7684\u5199\u6cd5\u5df2\u7ecf\u6210\u4e3a\u8fc7\u65f6\u7684\u65b9\u5f0f\u4e86\uff01<\/p>\n<p>\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\u6765\u7528\u4e2d\u6587\u8fdb\u884c\u91cd\u8ff0\uff1a<\/p>\n<blockquote><p>\u5728React 18\u4e2d\uff0crender\u51fd\u6570\u5df2\u7ecf\u88abcreateRoot\u51fd\u6570\u53d6\u4ee3\u3002\u6709\u5173\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u8003createRoot\u3002<\/p><\/blockquote>\n<p>\u6211\u4e4b\u524d\u8bf4\u8fc7\u2026<br \/>\n\u6240\u4ee5\uff0cReactDOM.render()\u5728React 18\u4e2d\u88ab\u66ff\u6362\u4e3acreateRoot().render()\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u6765\u91cd\u5199\u5e76\u89e3\u91ca\u76f8\u5173\u5185\u5bb9\u3002<\/p>\n<p>\u9996\u5148\uff0c\u5173\u4e8e`createRoot()`\u7684\u5199\u6cd5\uff0c\u53ef\u4ee5\u50cf\u8fd9\u6837\u5199\uff1a`createRoot(container[, options]);`\u3002\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u9488\u5bf9\u4f20\u5165\u7684`container`\u7684React\u6839\u7ec4\u4ef6\u5e76\u5c06\u5176\u8fd4\u56de\u3002\u53ef\u4ee5\u4f7f\u7528`root`\u7684`render`\u65b9\u6cd5\u5c06React\u5143\u7d20\u6e32\u67d3\u5230DOM\u5185\u90e8\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nx\">container<\/span><span class=\"p\">);<\/span>\r\n<span class=\"nx\">root<\/span><span class=\"p\">.<\/span><span class=\"nf\">render<\/span><span class=\"p\">(<\/span><span class=\"nx\">element<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u57fa\u4e8e\u6b64\uff0c\u8ba9\u6211\u4eec\u6539\u5199\u4e0a\u9762\u7684\u4f8b\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">App<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">h1<\/span><span class=\"p\">&gt;<\/span>Hello!<span class=\"p\">&lt;\/<\/span><span class=\"nt\">h1<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">p<\/span><span class=\"p\">&gt;<\/span>How are you?<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<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">createRoot<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">reacr-dom\/client<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">App<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/App<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">container<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">getElementById<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">root<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nx\">container<\/span><span class=\"p\">);<\/span> <span class=\"c1\">\/\/\u2190 \u5897\u52a0<\/span>\r\n<span class=\"nx\">root<\/span><span class=\"p\">.<\/span><span class=\"nf\">render<\/span><span class=\"p\">(&lt;<\/span><span class=\"nc\">App<\/span> <span class=\"p\">\/&gt;);<\/span>\r\n<\/code><\/pre>\n<p>\u4f60\u7a81\u7136\u51fa\u73b0\u4e86App.jsx&#8230;\u8fd9\u624d\u662fReact\u7684\u771f\u8c1b\uff0c\u5373\u5c06\u51fd\u6570\u7ec4\u4ef6\u5316\u3002\u7ec4\u4ef6\u6587\u4ef6\u7684\u6269\u5c55\u540d\u5199\u4f5c.jsx\uff0c\u76ee\u7684\u662f\u4e0eJavaScript\u6587\u4ef6\u533a\u5206\u5f00\u6765\u3002\u6211\u4eec\u4f1a\u5c06App.jsx\u5bfc\u51fa\uff0c\u4ee5\u4fbf\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u4f7f\u7528\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06App.jsx\u5f15\u5165index.js\u4e2d\uff0c\u4f7f\u7528import\u8bed\u53e5\u6765\u5b9e\u73b0\u3002\u53e6\u5916\uff0c\u8981\u4f7f\u7528createRoot()\u51fd\u6570\uff0c\u6211\u4eec\u4e0d\u662f\u4ecereact-dom\u5bfc\u5165\uff0c\u800c\u662f\u4ece\u65b0\u7684react-dom\/client\u5bfc\u5165\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4f7f\u7528{ }\u6765\u5f15\u5165\uff0c\u8868\u793a\u6211\u4eec\u9700\u8981\u76f4\u63a5\u4f7f\u7528ReactDOMClient\u63d0\u4f9b\u7684\u51fd\u6570\uff0c\u800c\u975e\u7ed9\u5b83\u53d6\u522b\u540d\u3002\u5982\u679c\u4e0d\u4f7f\u7528{ }\uff0c\u5219\u53ef\u4ee5\u81ea\u5b9a\u4e49\u540d\u79f0\u6765\u5b9a\u4e49\uff0c\u5e76\u5bfc\u5165ReactDOMClient\u672c\u8eab\u3002<\/p>\n<p>\u6216\u8bb8\u611f\u89c9\u4e0a\u6bd4ReactDOM\u591a\u4e86\u4e00\u53e5\u8bdd\uff0c\u4f46\u662f\u662f\u5426\u6709\u8ffd\u52a0createRoot\u7684\u597d\u5904\u5462\uff1f\u6211\u4ea7\u751f\u4e86\u8fd9\u4e2a\u7591\u95ee\u3002\u7ecf\u8fc7\u4e00\u756a\u8c03\u67e5\uff0c\u4f3c\u4e4e\u4ecev18\u5f00\u59cb\u5c31\u53ef\u4ee5\u8bbf\u95ee\u5e76\u53d1\u5904\u7406\u529f\u80fd\u7ec4\u3002\u8fd9\u79cd\u5e76\u53d1\u5904\u7406\u53ef\u4ee5\u5728\u6e32\u67d3\u8fc7\u7a0b\u4e2d\u5b9e\u73b0\u7528\u6237\u7684\u64cd\u4f5c\uff0c\u4ece\u800c\u63d0\u9ad8\u7528\u6237\u4f53\u9a8c\u3002\u6765\u81eaReact\u5b98\u65b9\u7684\u4fe1\u606f\u3002<\/p>\n<p>\u672a\u6765\uff0c\u7528\u6237\u4f53\u9a8c\u4e5f\u5c06\u53d8\u5f97\u5f88\u91cd\u8981\uff0c\u6240\u4ee5\u8003\u8651\u5230\u5f00\u53d1\u6210\u672c\uff0c\u52a0\u5feb\u5c1d\u8bd5\u5f15\u5165createRoot\uff0c\u5e76\u4e0d\u65ad\u614e\u91cd\u8003\u8651\uff0c\u662f\u5426\u5982\u4f55\u5462\uff1f<\/p>\n<p>\u56e0\u4e3a\u5185\u5bb9\u53d8\u957f\u4e86\uff0c\u6240\u4ee5\u6211\u60f3\u4eceprops\u5f00\u59cb\u8fdb\u884cPart2\u3002<\/p>\n<h2>\u8bf7\u53c2\u9605<\/h2>\n<ul 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