{"id":37969,"date":"2023-02-16T13:50:22","date_gmt":"2023-10-04T09:03:19","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8-react-js\/"},"modified":"2024-04-29T14:51:38","modified_gmt":"2024-04-29T06:51:38","slug":"%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8-react-js","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8-react-js\/","title":{"rendered":"\u5c1d\u8bd5\u4f7f\u7528 React.js"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u6700\u8fd1\uff0cReact.js\u4f3c\u4e4e\u5f88\u53d7\u6b22\u8fce\uff0c\u6211\u51b3\u5b9a\u5c1d\u8bd5\u4e00\u4e0b\uff0c\u7528\u5b83\u6765\u5f00\u53d1HTML\u548cJavaScript\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<h1>React.js \u662f\u4e00\u79cd\u7528\u4e8e\u6784\u5efa\u7528\u6237\u754c\u9762\u7684JavaScript\u5e93\u3002<\/h1>\n<p>React \u662f\u4e00\u500b\u7528\u65bc\u69cb\u5efa\u7528\u6236\u754c\u9762\u7684 JavaScript \u5eab\u3002\u5b83\u53ef\u4ee5\u4f5c\u70ba\u958b\u767c\u55ae\u9801\u61c9\u7528\u7a0b\u5e8f\u548c\u79fb\u52d5\u61c9\u7528\u7a0b\u5e8f\u7684\u57fa\u790e\u4f7f\u7528\u3002<\/p>\n<p>\u7ef4\u57fa\u767e\u79d1\u5bf9\u201cReact\u201d\u4e00\u8bcd\u7684\u89e3\u91ca\u3002<\/p>\n<h1>\u6211\u5c1d\u8bd5\u4f7f\u7528React.js\u3002<\/h1>\n<p>\u00b7 React.js 18 \uff1aReact.js 18\u7248\u672c<\/p>\n<h2>\u5b89\u88c5<\/h2>\n<p>\u4f7f\u7528Node.js\u6784\u5efa\u672c\u5730\u5f00\u53d1\u73af\u5883\u4f3c\u4e4e\u662f\u521b\u5efaReact.js\u5e94\u7528\u7a0b\u5e8f\u7684\u5e38\u89c1\u505a\u6cd5\u3002<\/p>\n<p>\u5728Qiita\u4e0a\uff0c\u6784\u5efaReact\u5f00\u53d1\u73af\u5883\u3002<\/p>\n<p>\u6211\u60f3\u4f7f\u7528\u4e00\u500b HTML \u6587\u4ef6\u4f86\u5275\u5efa\u4e00\u500b\u50c5\u5728\u700f\u89bd\u5668\u4e0a\u904b\u884c\u7684 React.js \u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n<p>\u4e0d\u4f7f\u7528npm\u6765\u6784\u5efaReact\u5f00\u53d1\u73af\u5883\u7684\u65b9\u6cd5\uff08\u4ece\u5b98\u65b9\u7f51\u7ad9\u4e0b\u8f7d\uff09 | \u8bed\u6cd5\u9519\u8bef\u3002<br \/>\n\u4e0d\u4f7f\u7528npm\u6765\u6784\u5efaReact\u5f00\u53d1\u73af\u5883\u7684\u65b9\u6cd5\uff08\u4f7f\u7528CDN\u63d0\u4f9b\u7684React\u548cbabel-core\uff09 | \u8bed\u6cd5\u9519\u8bef\u3002<\/p>\n<p>\u5c06\u4ee5\u4e0b\u5185\u5bb9\u6dfb\u52a0\u5230HTML\u6587\u4ef6\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"nt\">&lt;script <\/span><span class=\"na\">src=<\/span><span class=\"s\">\"https:\/\/unpkg.com\/react@18\/umd\/react.development.js\"<\/span> <span class=\"na\">crossorigin<\/span><span class=\"nt\">&gt;&lt;\/script&gt;<\/span>\r\n  <span class=\"nt\">&lt;script <\/span><span class=\"na\">src=<\/span><span class=\"s\">\"https:\/\/unpkg.com\/react-dom@18\/umd\/react-dom.development.js\"<\/span> <span class=\"na\">crossorigin<\/span><span class=\"nt\">&gt;&lt;\/script&gt;<\/span>\r\n  <span class=\"nt\">&lt;script <\/span><span class=\"na\">src=<\/span><span class=\"s\">\"https:\/\/unpkg.com\/babel-standalone@6\/babel.min.js\"<\/span><span class=\"nt\">&gt;&lt;\/script&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u4f7f\u7528React.js\u7684\u4ee3\u7801\u5e94\u5199\u5728\u4ee5\u4e0b<script>\u6807\u7b7e\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"nt\">&lt;script <\/span><span class=\"na\">type=<\/span><span class=\"s\">\"text\/babel\"<\/span><span class=\"nt\">&gt;<\/span>\r\n<\/code><\/pre>\n<h2>\u6e32\u67d3<\/h2>\n<p>\u5728HTML\u6587\u4ef6\u4e2d\uff0c\u6211\u4eec\u51c6\u5907\u4e86\u4e00\u4e2a\u6807\u7b7e\u4f5c\u4e3a\u5e94\u7528\u7a0b\u5e8f\u7684\u8d77\u70b9\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"nt\">&lt;body&gt;<\/span>\r\n    <span class=\"nt\">&lt;div<\/span> <span class=\"na\">id=<\/span><span class=\"s\">\"root\"<\/span><span class=\"nt\">&gt;&lt;\/div&gt;<\/span>\r\n  <span class=\"nt\">&lt;\/body&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u4f7f\u7528 JavaScript \u4ee3\u7801\u5c06 HTML \u6807\u7b7e\u5448\u73b0\u5230\u8d77\u59cb\u6807\u7b7e\u5904\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">ReactDOM<\/span><span class=\"p\">.<\/span><span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">querySelector<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">#root<\/span><span class=\"dl\">'<\/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>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Hello<\/span><span class=\"p\">,<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">js<\/span><span class=\"o\">!&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u8bf7\u53c2\u8003React\u5165\u95e8\u6559\u7a0b\u7b2c\u4e8c\u90e8\u5206\u2014\u2014JSX | Hypertext Candy\u3002<\/p>\n<p>\u6d4f\u89c8\u7f51\u7edc\u5165\u95e8\u6587\u7ae0\u65f6\uff0c\u6211\u6ce8\u610f\u5230\u4ee5\u4e0b\u5199\u6cd5\u5f88\u5e38\u89c1\u3002\u5728\u6700\u65b0\u7684React.js\u4e2d\uff0c\u524d\u8ff0\u7684\u5199\u6cd5\u4f3c\u4e4e\u66f4\u597d\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">querySelector<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">#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\">((<\/span>\r\n      <span class=\"p\">........<\/span>\r\n    <span class=\"p\">),<\/span> <span class=\"nx\">root<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5728React 18\u4e2d\uff0c\u4f7f\u7528createRoot\u800c\u4e0d\u662fReactDOM.render\u8fdb\u884c\u6e32\u67d3\u3002\u53c2\u8003\u6765\u6e90\uff1aiwb.jp<\/p>\n<p>\u5728\"render()\"\u51fd\u6570\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528HTML\u6807\u7b7e\u6765\u5d4c\u5165JavaScript\u4ee3\u7801\u7684\u53d8\u91cf\u548c\u8868\u8fbe\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">name<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">React.js!<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">ReactDOM<\/span><span class=\"p\">.<\/span><span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">querySelector<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">#root<\/span><span class=\"dl\">'<\/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>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Hello<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">name<\/span> <span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u4e5f\u53ef\u4ee5\u5c06\u6570\u7ec4\u6570\u636e\u8fdb\u884c\u5217\u8868\u663e\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">members<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span>\r\n      <span class=\"p\">{<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">John<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"na\">instrument<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">guitar<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">},<\/span>\r\n      <span class=\"p\">{<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Paul<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"na\">instrument<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">bass<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">},<\/span>\r\n      <span class=\"p\">{<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">George<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"na\">instrument<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">guitar<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">},<\/span>\r\n      <span class=\"p\">{<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Ringo<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"na\">instrument<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">drums<\/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\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">ReactDOM<\/span><span class=\"p\">.<\/span><span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">querySelector<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">#root<\/span><span class=\"dl\">'<\/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>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"p\">{<\/span> \r\n          <span class=\"nx\">members<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">member<\/span><span class=\"p\">,<\/span> <span class=\"nx\">index<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span>\r\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span> <span class=\"nx\">key<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">index<\/span> <span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">member<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span> <span class=\"p\">}<\/span> <span class=\"nx\">plays<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">member<\/span><span class=\"p\">.<\/span><span class=\"nx\">instrument<\/span> <span class=\"p\">}.<\/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      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u4e2a\u4eba\u800c\u8a00\uff0c\u6211\u89c9\u5f97Vue.js\u7684<v-for>\u66f4\u6613\u7406\u89e3\u3002<\/p>\n<h2>\u521b\u5efa\u7ec4\u4ef6<\/h2>\n<p>React.js \u53ef\u4ee5\u521b\u5efa\u548c\u4f7f\u7528\u81ea\u5b9a\u4e49\u7ec4\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">class<\/span> <span class=\"nc\">Element<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nf\">render<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Hello<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">props<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span> <span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p&gt;<\/span><span class=\"err\">;\r\n<\/span>      <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">ReactDOM<\/span><span class=\"p\">.<\/span><span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">querySelector<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">#root<\/span><span class=\"dl\">'<\/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>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">Element<\/span> <span class=\"nx\">name<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">React.js<\/span><span class=\"dl\">\"<\/span> <span class=\"o\">\/&gt;<\/span>\r\n    <span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u542c\u8d77\u6765\u597d\u50cf\u53ef\u4ee5\u521b\u5efa\u81ea\u5b9a\u4e49\u6807\u7b7e\u3002\u60a8\u53ef\u4ee5\u4ece\u547c\u53eb\u8005\u90a3\u91cc\u4f20\u9012\u503c\uff0c\u7136\u540e\u5728\u7ec4\u4ef6\u4e2d\u63a5\u6536\u548c\u4f7f\u7528\u5b83\u4eec\u3002\u636e\u8bf4\u8fd9\u88ab\u79f0\u4e3a\"\u5c5e\u6027\"\u3002<\/p>\n<p>\u8fd1\u671f\u7684 React.js \u5efa\u8bae\u4f7f\u7528\u51fd\u6570\u6765\u5b9a\u4e49\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u7c7b\u3002\u5c5e\u6027\u901a\u8fc7\u53c2\u6570\u8fdb\u884c\u63a5\u6536\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">Element<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"k\">return<\/span> <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Hello<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">props<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span> <span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p&gt;<\/span><span class=\"err\">;\r\n<\/span>    <span class=\"p\">};<\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">ReactDOM<\/span><span class=\"p\">.<\/span><span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">querySelector<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">#root<\/span><span class=\"dl\">'<\/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>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">Element<\/span> <span class=\"nx\">name<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">React.js<\/span><span class=\"dl\">\"<\/span> <span class=\"o\">\/&gt;<\/span>\r\n    <span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u66f4\u6539\u63a5\u6536\u300c\u5c5e\u6027\u300d\u7684\u90e8\u5206\u3002\u2193<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">Element<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">({<\/span> <span class=\"nx\">name<\/span> <span class=\"p\">})<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"k\">return<\/span> <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Hello<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">name<\/span> <span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p&gt;<\/span><span class=\"err\">;\r\n<\/span>    <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u53c2\u8003 \u3010React\u3011\u521d\u5b66\u8005\u5411\u3051\u306b\u7b80\u5355\u89e3\u91ca\u7ec4\u4ef6\u7684\u57fa\u672c\u77e5\u8bc6\u548c\u4f7f\u7528\u65b9\u6cd5\uff01 |  \"\u3061\u3087\u3044\u3063\u307d\"<\/p>\n<h2>\u5728\u7ec4\u4ef6\u4e0a\u6dfb\u52a0\u72b6\u6001<\/h2>\n<p>\u7ec4\u4ef6\u4e0d\u4ec5\u53ef\u4ee5\u4ece\u8c03\u7528\u65b9\u63a5\u6536\u5e76\u4f7f\u7528\u503c\uff0c\u8fd8\u53ef\u4ee5\u5728\u5185\u90e8\u4fdd\u6301\u548c\u4f7f\u7528\u503c\u3002<\/p>\n<p>\u6211\u5c06\u5c1d\u8bd5\u521b\u5efa\u4e00\u4e2a\u8ba1\u6570\u589e\u52a0\u6309\u94ae\u7684\u7ec4\u4ef6\u3002\u2193<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">CountButton<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <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=\"kd\">function<\/span> <span class=\"nf\">addCount<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n        <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\r\n      <span class=\"k\">return <\/span><span class=\"p\">(<\/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\">addCount<\/span> <span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">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\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"p\">);<\/span>\r\n    <span class=\"p\">};<\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">root<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">ReactDOM<\/span><span class=\"p\">.<\/span><span class=\"nf\">createRoot<\/span><span class=\"p\">(<\/span><span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nf\">querySelector<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">#root<\/span><span class=\"dl\">'<\/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>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">CountButton<\/span> <span class=\"o\">\/&gt;<\/span>\r\n    <span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u8ba1\u6570\u7684\u503c\u4f1a\u6539\u53d8\uff0c\u4f46\u662f\u663e\u793a\u7684\u503c\u4e0d\u4f1a\u6539\u53d8\u3002\u5b83\u4e0d\u4f1a\u91cd\u65b0\u7ed8\u5236\u3002<br \/>\n\u56e0\u6b64\uff0cReact.js \u63d0\u4f9b\u4e86\u4e00\u79cd\u673a\u5236\uff0c\u5728\u66f4\u6539\u503c\u7684\u540c\u65f6\u91cd\u65b0\u7ed8\u5236\u3002\u8fd9\u88ab\u79f0\u4e3a\u201c\u72b6\u6001\u201d\u7ba1\u7406\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">CountButton<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"nx\">React<\/span><span class=\"p\">.<\/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=\"kd\">function<\/span> <span class=\"nf\">addCount<\/span><span class=\"p\">()<\/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\r\n      <span class=\"nx\">\u4ee5\u4e0b\u7565<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4f7f\u7528useState\u65f6\uff0c\u6211\u4eec\u9700\u8981\u9884\u5148\u51c6\u5907\u4e00\u4e2a\u53d8\u91cf\u548c\u4e00\u4e2a\u7528\u4e8e\u66f4\u65b0\u53d8\u91cf\u7684\u65b9\u6cd5\u3002useState\u7684\u53c2\u6570\u662f\u53d8\u91cf\u7684\u521d\u59cb\u503c\u3002<\/p>\n<p>\u53c2\u8003 React \u5165\u95e8\u6559\u7a0b (3)\uff1a\u5c5e\u6027\u548c\u72b6\u6001 | \u8d85\u6587\u672c\u7cd6\u679c<\/p>\n<p>\u5f53\u53d8\u91cf\u4e3a\u6570\u7ec4\u65f6\uff0c\u8be5\u600e\u4e48\u529e\u5462\uff1f\u2193<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">Element<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span> <span class=\"nx\">items<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setItems<\/span> <span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">useState<\/span><span class=\"p\">([<\/span>\r\n        <span class=\"p\">{<\/span> <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Item1<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"na\">amount<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span> <span class=\"p\">},<\/span>\r\n        <span class=\"p\">{<\/span> <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Item2<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"na\">amount<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span> <span class=\"p\">},<\/span>\r\n        <span class=\"p\">{<\/span> <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Item3<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"na\">amount<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span> <span class=\"p\">},<\/span>\r\n      <span class=\"p\">]);<\/span>\r\n\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">addItem<\/span><span class=\"p\">(<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">push<\/span><span class=\"p\">(<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span>  \r\n      <span class=\"p\">}<\/span>\r\n\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">updateItem<\/span><span class=\"p\">(<\/span><span class=\"nx\">index<\/span><span class=\"p\">,<\/span> <span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nx\">items<\/span><span class=\"p\">[<\/span><span class=\"nx\">index<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">item<\/span> <span class=\"p\">};<\/span>\r\n      <span class=\"p\">}<\/span>\r\n\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">removeItem<\/span><span class=\"p\">(<\/span><span class=\"nx\">index<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">splice<\/span><span class=\"p\">(<\/span><span class=\"nx\">index<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n      <span class=\"p\">}<\/span>\r\n\r\n      <span class=\"nx\">\u4ee5\u4e0b\u7565<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u524d\u7684\u505a\u6cd5\u65e0\u6cd5\u91cd\u65b0\u7ed8\u5236\u3002\u8bf7\u4f7f\u7528useState\u4e2d\u63d0\u4f9b\u7684\u65b9\u6cd5\u3002\u2193<\/p>\n<pre class=\"post-pre\"><code>      <span class=\"kd\">function<\/span> <span class=\"nf\">addItem<\/span><span class=\"p\">(<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">setItems<\/span><span class=\"p\">([<\/span> <span class=\"p\">...<\/span><span class=\"nx\">items<\/span><span class=\"p\">,<\/span> <span class=\"nx\">item<\/span> <span class=\"p\">]);<\/span>\r\n      <span class=\"p\">}<\/span>\r\n\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">updateItem<\/span><span class=\"p\">(<\/span><span class=\"nx\">index<\/span><span class=\"p\">,<\/span> <span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">setItems<\/span><span class=\"p\">(<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">,<\/span> <span class=\"nx\">n<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">n<\/span> <span class=\"o\">==<\/span> <span class=\"nx\">index<\/span><span class=\"p\">)<\/span> <span class=\"nx\">items<\/span><span class=\"p\">[<\/span><span class=\"nx\">index<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">item<\/span> <span class=\"p\">};<\/span> <span class=\"k\">return<\/span> <span class=\"nx\">item<\/span><span class=\"p\">;<\/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\">removeItem<\/span><span class=\"p\">(<\/span><span class=\"nx\">index<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">setItems<\/span><span class=\"p\">(<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">filter<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">,<\/span> <span class=\"nx\">n<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span><span class=\"nx\">n<\/span> <span class=\"o\">!=<\/span> <span class=\"nx\">index<\/span><span class=\"p\">)));<\/span>\r\n      <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4f7f\u7528useState\u65f6\uff0c\u53c2\u8003\u4ee5\u4e0b\u65b9\u6cd5\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u3001\u5220\u9664\u548c\u4fee\u6539\u5143\u7d20 - Qiita<\/p>\n<h2>\u5904\u7406\u4e8b\u4ef6<\/h2>\n<p>\u5df2\u7ecf\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\u5199\u8fc7\u4e86\uff0cHTML \u6807\u7b7e\u53ef\u4ee5\u5904\u7406\u63a5\u6536\u5230\u7684\u4e8b\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">Element<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span> <span class=\"nx\">name<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setName<\/span> <span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">React.js<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">handleChange<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">setName<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/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><span class=\"nx\">Hello<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">name<\/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\">input<\/span> <span class=\"nx\">value<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">name<\/span> <span class=\"p\">}<\/span> <span class=\"nx\">onChange<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">handleChange<\/span> <span class=\"p\">}<\/span> <span class=\"sr\">\/<\/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>\u53c2\u8003React\u5165\u95e8\u6559\u7a0b\uff084\uff09\uff1a\u8868\u5355\u548c\u4e8b\u4ef6\u5904\u7406 | \u8d85\u6587\u672c\u7cd6\u679c<\/p>\n<h2>\u5728\u7ec4\u4ef6\u4e4b\u95f4\u5171\u4eab\u72b6\u6001<\/h2>\n<p>\u5f53\u60a8\u60f3\u5728\u5b50\u7ec4\u4ef6\u6216\u5b59\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u5728\u6839\u7ec4\u4ef6\u4e2d\u58f0\u660e\u7684\u53d8\u91cf\u65f6\uff0c\u8be5\u5982\u4f55\u64cd\u4f5c\u5462\uff1f<\/p>\n<p>\u53ea\u9700\u5c06\u901a\u8fc7 useState \u51c6\u5907\u597d\u7684\u53d8\u91cf\u548c\u65b9\u6cd5\u4f5c\u4e3a\u201c\u5c5e\u6027\u201d\u4f20\u9012\u7ed9\u7ec4\u4ef6\u5373\u53ef\u3002\u2193<\/p>\n<p>\u5c06 useState \u521b\u5efa\u7684\u53d8\u91cf\u548c\u65b9\u6cd5\u76f4\u63a5\u4f20\u9012\u7ed9\u7ec4\u4ef6\u4f5c\u4e3a\u201c\u5c5e\u6027\u201d\u5373\u53ef\u3002\u2193<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">App<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"nx\">React<\/span><span class=\"p\">.<\/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=\"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\">Parent<\/span> <span class=\"nx\">count<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">}<\/span> <span class=\"nx\">setCount<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">setCount<\/span> <span class=\"p\">}<\/span> <span class=\"sr\">\/<\/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\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"p\">{<\/span>\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">addCount<\/span><span class=\"p\">()<\/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\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><span class=\"nx\">Parent<\/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=\"nx\">addCount<\/span> <span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>          <span class=\"o\">&lt;<\/span><span class=\"nx\">Child<\/span> <span class=\"nx\">count<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">}<\/span> <span class=\"nx\">setCount<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">setCount<\/span> <span class=\"p\">}<\/span> <span class=\"sr\">\/<\/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\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"p\">{<\/span>\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">addCount<\/span><span class=\"p\">()<\/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\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><span class=\"nx\">Child<\/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=\"nx\">addCount<\/span> <span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>          <span class=\"o\">&lt;<\/span><span class=\"nx\">GrandChild<\/span> <span class=\"nx\">count<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">}<\/span> <span class=\"nx\">setCount<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">setCount<\/span> <span class=\"p\">}<\/span> <span class=\"sr\">\/<\/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\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">GrandChild<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"p\">{<\/span>\r\n      <span class=\"kd\">function<\/span> <span class=\"nf\">addCount<\/span><span class=\"p\">()<\/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\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><span class=\"nx\">GrandChild<\/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=\"nx\">addCount<\/span> <span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span> <span class=\"nx\">count<\/span> <span class=\"p\">}<\/span><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\">\/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>\u5f53\u9700\u8981\u4f20\u9012\u7684\u53d8\u91cf\u6216\u65b9\u6cd5\u53d8\u5f97\u5f88\u591a\uff0c\u6216\u8005\u7236\u5b50\u5c42\u6b21\u53d8\u5f97\u5f88\u6df1\u65f6\uff0c\u901a\u8fc7\u53c2\u6570\u4f20\u9012\u53d8\u5f97\u5f88\u9ebb\u70e6\u3002<br \/>\n\u56e0\u6b64\uff0cReact.js \u63d0\u4f9b\u4e86\u4e00\u79cd\u53ef\u4ee5\u5b58\u50a8\u5168\u5c40\u72b6\u6001\u7684\u673a\u5236\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">CountContext<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">createContext<\/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=\"kd\">function<\/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=\"nx\">React<\/span><span class=\"p\">.<\/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=\"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\">CountContext<\/span><span class=\"p\">.<\/span><span class=\"nx\">Provider<\/span> <span class=\"nx\">value<\/span><span class=\"o\">=<\/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\">&gt;<\/span>\r\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">Parent<\/span> <span class=\"o\">\/&gt;<\/span>\r\n          <span class=\"o\">&lt;<\/span><span class=\"sr\">\/CountContext.Provider<\/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\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">Parent<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">CountContext<\/span><span class=\"p\">);<\/span>\r\n   \r\n      <span class=\"nx\">\u4e2d\u7565<\/span>    \r\n\r\n          <span class=\"o\">&lt;<\/span><span class=\"nx\">Child<\/span> <span class=\"o\">\/&gt;<\/span>\r\n        <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\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">CountContext<\/span><span class=\"p\">);<\/span>\r\n\r\n      <span class=\"nx\">\u4e2d\u7565<\/span>    \r\n          <span class=\"o\">&lt;<\/span><span class=\"nx\">GrandChild<\/span> <span class=\"o\">\/&gt;<\/span>\r\n        <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\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">GrandChild<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/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=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">CountContext<\/span><span class=\"p\">);<\/span>\r\n\r\n      <span class=\"nx\">\u4e2d\u7565<\/span>    \r\n    <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u5011\u4f7f\u7528 useContext \u6240\u6e96\u5099\u7684\u7269\u4ef6\u3002<\/p>\n<p>\u53c2\u8003\u3010React\u3011\u4f7f\u7528useContext\u65b9\u6cd5\uff01\u4ee5\u521d\u5b66\u8005\u4e3a\u76ee\u6807\u7b80\u660e\u89e3\u6790\uff01 | \u3061\u3087\u3044\u3063\u307d<\/p>\n<h2>\u5728\u6e32\u67d3\u65f6\u6267\u884c<\/h2>\n<p>\u6211\u5e0c\u671b\u5728\u6e32\u67d3\u65f6\u6267\u884c\u5904\u7406\u7684\u65f6\u673a\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">App<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span> <span class=\"nx\">visible<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setVisible<\/span> <span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/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\">function<\/span> <span class=\"nf\">toggleVisible<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">setVisible<\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"nx\">visible<\/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\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span> <span class=\"nx\">toggleVisible<\/span> <span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u8868\u793a\u3092\u5207\u66ff<\/span><span class=\"o\">&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=\"p\">{<\/span> <span class=\"nx\">visible<\/span> <span class=\"p\">?<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">true<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">false<\/span><span class=\"dl\">\"<\/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\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span> <span class=\"nx\">visible<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"o\">&lt;<\/span><span class=\"nx\">Child<\/span> <span class=\"o\">\/&gt;<\/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=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"p\">);<\/span>\r\n    <span class=\"p\">};<\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">Child<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">useEffect<\/span><span class=\"p\">(<\/span><span class=\"kd\">function<\/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, Child.<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n      \r\n        <span class=\"k\">return<\/span><span class=\"p\">(<\/span><span class=\"kd\">function<\/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\">Bye, Child.<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n        <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\">span<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Child<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/span<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"p\">)<\/span>\r\n    <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u3010React\u3011useEffect\u7684\u4f7f\u7528\u65b9\u6cd5\u53c2\u8003\uff01\u4e3a\u521d\u5b66\u8005\u8fdb\u884c\u7b80\u660e\u89e3\u91ca\uff01 | \u3061\u3087\u3044\u3063\u307d<\/p>\n<p>\u201c\u7528\u6237\u72b6\u6001\u7684\u7528\u9014\u662f\u4ec0\u4e48\u5462\uff1f\u201d<\/p>\n<p>\u5728\u88ab\u95ee\u5230\u201cuseEffect\u7684\u4f7f\u7528\u65b9\u6cd5\u6b63\u786e\u5417\uff1f\u201d\u4e4b\u524d\uff0c\u8bf7\u53c2\u8003\u3010\u4fdd\u5b58\u7248\u3011\u3002<\/p>\n<h2>\u5728\u4e2d\u56fd\u672c\u571f\uff0c\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u51c6\u786e\u7684\u4e2d\u6587\u91ca\u4e49\uff0c\u4ec5\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a<\/p>\n<p>\u6559\u7a0b<\/h2>\n<p>\u5f53\u4f60\u7406\u89e3\u4e86\u8fd9\u4e9b\u57fa\u672c\u4fe1\u606f\u540e\uff0c\u6211\u8ba4\u4e3a\u4ee5\u4e0b\u7684\u6559\u7a0b\u4f1a\u53d8\u5f97\u76f8\u5bf9\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<p>\u6559\u7a0b\uff1a\u5f15\u5165React - React<\/p>\n<p><\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u6700\u8fd1\uff0cReact.js\u4f3c\u4e4e\u5f88\u53d7\u6b22\u8fce\uff0c\u6211\u51b3\u5b9a\u5c1d\u8bd5\u4e00\u4e0b\uff0c\u7528\u5b83\u6765\u5f00\u53d1HTML\u548cJavaScript\u7684\u5e94\u7528\u7a0b\u5e8f\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-37969","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>\u5c1d\u8bd5\u4f7f\u7528 React.js - 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\/\u5c1d\u8bd5\u4f7f\u7528-react-js\/\" \/>\n<meta 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