{"id":50605,"date":"2025-08-10T11:01:58","date_gmt":"2025-08-10T03:01:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/50605.html"},"modified":"2025-08-10T11:01:58","modified_gmt":"2025-08-10T03:01:58","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88-react-%e8%a6%81-%e6%b7%98%e6%b1%b0-%e6%97%a7%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f%ef%bc%9f%e4%bb%8e%e5%8e%9f%e7%90%86%e5%88%b0%e5%ae%9e%e8%b7%b5%ef%bc%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/50605.html","title":{"rendered":"\u4e3a\u4ec0\u4e48 React \u8981 \u201c\u6dd8\u6c70\u201d \u65e7\u751f\u547d\u5468\u671f\uff1f\u4ece\u539f\u7406\u5230\u5b9e\u8df5\uff0c\u4e00\u6587\u8bfb\u61c2\u94a9\u5b50\u51fd\u6570\u7684\u8fed\u4ee3\u903b\u8f91"},"content":{"rendered":"<h2>React\u65b0\u65e7\u751f\u547d\u5468\u671f\u8be6\u89e3&#xff1a;\u4ece\u539f\u7406\u5230\u5b9e\u8df5<\/h2>\n<h3>\u4e00\u3001React\u751f\u547d\u5468\u671f\u6982\u8ff0<\/h3>\n<p>React\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u662f\u6307\u7ec4\u4ef6\u4ece\u521b\u5efa\u5230\u5378\u8f7d\u7684\u6574\u4e2a\u8fc7\u7a0b&#xff0c;\u5b83\u63d0\u4f9b\u4e86\u591a\u4e2a\u94a9\u5b50\u51fd\u6570\u8ba9\u5f00\u53d1\u8005\u80fd\u591f\u5728\u4e0d\u540c\u9636\u6bb5\u6267\u884c\u7279\u5b9a\u64cd\u4f5c\u3002\u968f\u7740React\u7248\u672c\u7684\u8fed\u4ee3&#xff0c;\u751f\u547d\u5468\u671fAPI\u53d1\u751f\u4e86\u91cd\u8981\u53d8\u5316&#xff0c;\u5c24\u5176\u662f\u5728React 16.3\u7248\u672c\u4e2d\u5f15\u5165\u4e86\u65b0\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5&#xff0c;\u540c\u65f6\u6807\u8bb0\u4e86\u90e8\u5206\u65e7\u65b9\u6cd5\u4e3a\u4e0d\u5b89\u5168(UNSAFE_)\u3002<\/p>\n<h3>\u4e8c\u3001\u65e7\u7248\u751f\u547d\u5468\u671f&#xff08;React 16.3\u4e4b\u524d&#xff09;<\/h3>\n<h4>1. \u751f\u547d\u5468\u671f\u6267\u884c\u987a\u5e8f<\/h4>\n<p>\u65e7\u7248\u751f\u547d\u5468\u671f\u4e3b\u8981\u5206\u4e3a\u4e09\u4e2a\u9636\u6bb5&#xff1a;\u521d\u59cb\u5316\u9636\u6bb5\u3001\u66f4\u65b0\u9636\u6bb5\u548c\u5378\u8f7d\u9636\u6bb5\u3002<\/p>\n<p>\u521d\u59cb\u5316\u9636\u6bb5&#xff08;\u7531ReactDOM.render()\u89e6\u53d1&#xff09;<\/p>\n<li>constructor()<\/li>\n<li>componentWillMount()<\/li>\n<li>render()<\/li>\n<li>componentDidMount() &#061;&#061;&#061;&gt; \u5e38\u7528 \u66f4\u65b0\u9636\u6bb5&#xff08;\u7531this.setState()\u6216\u7236\u7ec4\u4ef6render\u89e6\u53d1&#xff09;<\/li>\n<p>\u66f4\u65b0\u9636\u6bb5&#xff08;\u7531this.setState()\u6216\u7236\u7ec4\u4ef6render\u89e6\u53d1&#xff09;<\/p>\n<li>componentWillReceiveProps()<\/li>\n<li>shouldComponentUpdate()<\/li>\n<li>componentWillUpdate()<\/li>\n<li>render() &#061;&#061;&#061;&gt; \u5fc5\u987b\u4f7f\u7528<\/li>\n<li>componentDidUpdate()<\/li>\n<p>\u5378\u8f7d\u9636\u6bb5&#xff08;\u7531ReactDOM.unmountComponentAtNode()\u89e6\u53d1&#xff09;<\/p>\n<li>componentWillUnmount() &#061;&#061;&#061;&gt; \u5e38\u7528 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250810030155-68980ba3c1917.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<p>\u65e7\u751f\u547d\u5468\u671f\u56fe<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250810030156-68980ba413d60.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>2.\u65e7\u751f\u547d\u5468\u671f\u4ee3\u7801\u793a\u4f8b<\/h4>\n<p>\u70b9\u51fb\u67e5\u770b\u65e7\u751f\u547d\u5468\u671f\u6f14\u793a<\/p>\n<h3>\u4e09\u3001\u65b0\u7248\u751f\u547d\u5468\u671f&#xff08;React 16.3\u53ca\u4ee5\u540e&#xff09;<\/h3>\n<h4>1. \u751f\u547d\u5468\u671f\u6267\u884c\u987a\u5e8f<\/h4>\n<p>\u65b0\u7248\u751f\u547d\u5468\u671f\u5f15\u5165\u4e86\u4e24\u4e2a\u65b0\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5&#xff0c;\u5e76\u5bf9\u4e09\u4e2a\u65e7\u65b9\u6cd5\u6dfb\u52a0\u4e86UNSAFE_\u524d\u7f00\u3002<\/p>\n<p>\u6302\u8f7d\u9636\u6bb5<\/p>\n<li>constructor()<\/li>\n<li>static getDerivedStateFromProps()<\/li>\n<li>render()<\/li>\n<li>componentDidMount()<\/li>\n<p>\u66f4\u65b0\u9636\u6bb5<\/p>\n<li>static getDerivedStateFromProps()<\/li>\n<li>shouldComponentUpdate()<\/li>\n<li>render()<\/li>\n<li>getSnapshotBeforeUpdate()<\/li>\n<li>componentDidUpdate()<\/li>\n<p>\u5378\u8f7d\u9636\u6bb5<\/p>\n<li>componentWillUnmount()<\/li>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250810030156-68980ba447f21.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u65b0\u751f\u547d\u5468\u671f\u56fe<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250810030156-68980ba480a89.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>2. \u65b0\u751f\u547d\u5468\u671f\u4ee3\u7801\u793a\u4f8b<\/h4>\n<p>\u70b9\u51fb\u67e5\u770b\u65b0\u751f\u547d\u5468\u671f\u6f14\u793a<\/p>\n<p>\u6d3e\u751f\u72b6\u6001\u7684\u4f5c\u7528<\/p>\n<p>\u6d3e\u751f\u72b6\u6001\u4e3b\u8981\u7528\u4e8e\u4ee5\u4e0b\u573a\u666f&#xff1a;<\/p>\n<li>\u521d\u59cb\u5316\u72b6\u6001&#xff1a;\u57fa\u4e8e props \u521d\u59cb\u5316 state<\/li>\n<li>\u54cd\u5e94 props \u53d8\u5316&#xff1a;\u5f53 props \u53d8\u5316\u65f6\u66f4\u65b0 state<\/li>\n<li>\u6570\u636e\u683c\u5f0f\u5316&#xff1a;\u5c06 props \u6570\u636e\u8f6c\u6362\u4e3a\u7279\u5b9a\u683c\u5f0f<\/li>\n<h3>\u56db\u3001\u4e3a\u4ec0\u4e48\u8981\u5f03\u7528\u65e7\u7684\u751f\u547d\u5468\u671f\u94a9\u5b50<\/h3>\n<p>\u65b0\u751f\u547d\u5468\u671f\u6539\u52a8&#xff1a;&#xff08;\u5e26Will\u7684\u8981\u6539&#xff0c;\u9664\u4e86componentWillUnmount&#xff09;<\/p>\n<p>componentWillMount \u2192 UNSAFE_componentWillMount<\/p>\n<p>componentWillReceiveProps \u2192 UNSAFE_componentWillReceiveProps<\/p>\n<p>componentWillUpdate \u2192 UNSAFE_componentWillUpdate<\/p>\n<p>\u4e3a\u4ec0\u4e48\u66f4\u6539&#xff0c;\u5b98\u7f51\u7ed9\u51fa\u7b54\u6848&#xff1a;(\u4e0d\u662f\u6838\u5fc3\u7684\u94a9\u5b50)<\/p>\n<p>React\u56e2\u961f\u5728\u81f4\u529b\u4e8e\u5b9e\u73b0\u5f02\u6b65\u6e32\u67d3\u7684\u8fc7\u7a0b\u4e2d\u53d1\u73b0&#xff0c;\u67d0\u4e9b\u65e7\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5\u5bb9\u6613\u5bfc\u81f4\u4e0d\u5b89\u5168\u7684\u7f16\u7801\u5b9e\u8df5\u3002\u6839\u636e\u5b98\u65b9\u6587\u6863&#xff0c;\u4ee5\u4e0b\u65b9\u6cd5\u88ab\u6807\u8bb0\u4e3a\u4e0d\u5b89\u5168&#xff1a;<\/p>\n<ul>\n<li>componentWillMount<\/li>\n<li>componentWillReceiveProps<\/li>\n<li>componentWillUpdate \u8fd9\u4e9b\u65b9\u6cd5\u88ab\u5f03\u7528\u7684\u4e3b\u8981\u539f\u56e0\u5305\u62ec&#xff1a;<\/li>\n<\/ul>\n<li>\u5f02\u6b65\u6e32\u67d3\u5bfc\u81f4\u7684\u95ee\u9898 &#xff1a;\u5728\u5f02\u6b65\u6e32\u67d3\u6a21\u5f0f\u4e0b&#xff0c;\u8fd9\u4e9b\u751f\u547d\u5468\u671f\u53ef\u80fd\u4f1a\u88ab\u8c03\u7528\u591a\u6b21&#xff0c;\u6216\u8005\u5728\u6e32\u67d3\u4e4b\u524d\u88ab\u53d6\u6d88&#xff0c;\u5bb9\u6613\u5bfc\u81f4\u4e0d\u4e00\u81f4\u7684\u72b6\u6001\u548c\u5185\u5b58\u6cc4\u6f0f\u3002<\/li>\n<li>\u6ee5\u7528\u98ce\u9669 &#xff1a;\u8fd9\u4e9b\u65b9\u6cd5\u7ecf\u5e38\u88ab\u8bef\u89e3\u548c\u6ee5\u7528\u3002\u4f8b\u5982&#xff0c;\u5f00\u53d1\u8005\u53ef\u80fd\u4f1a\u5728componentWillMount\u4e2d\u8fdb\u884c\u6570\u636e\u83b7\u53d6&#xff0c;\u8fd9\u5728\u670d\u52a1\u7aef\u6e32\u67d3\u4e2d\u4f1a\u5bfc\u81f4\u95ee\u9898&#xff0c;\u5e76\u4e14\u5728\u5f02\u6b65\u6e32\u67d3\u4e2d\u53ef\u80fd\u88ab\u8c03\u7528\u591a\u6b21\u3002<\/li>\n<li>\u66f4\u597d\u7684\u66ff\u4ee3\u65b9\u6848 &#xff1a;\u65b0\u7684\u751f\u547d\u5468\u671f\u63d0\u4f9b\u4e86\u66f4\u5b89\u5168\u3001\u66f4\u53ef\u9884\u6d4b\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u76f8\u540c\u7684\u529f\u80fd\u3002getDerivedStateFromProps\u66ff\u4ee3\u4e86componentWillReceiveProps&#xff0c;getSnapshotBeforeUpdate\u66ff\u4ee3\u4e86componentWillUpdate\u7684\u90e8\u5206\u4f7f\u7528\u573a\u666f\u3002 React\u56e2\u961f\u5728\u8fd9\u4e9b\u65b9\u6cd5\u540d\u79f0\u524d\u6dfb\u52a0\u4e86&#034;UNSAFE_&#034;\u524d\u7f00&#xff0c;\u660e\u786e\u8868\u793a\u4f7f\u7528\u8fd9\u4e9b\u751f\u547d\u5468\u671f\u7684\u4ee3\u7801\u5728React\u7684\u672a\u6765\u7248\u672c\u4e2d\u66f4\u6709\u53ef\u80fd\u51fa\u73b0bug&#xff0c;\u5c24\u5176\u662f\u5728\u542f\u7528\u5f02\u6b65\u6e32\u67d3\u4e4b\u540e\u3002<\/li>\n<h3>\u4e94\u3001\u65b0\u751f\u547d\u5468\u671f\u65b9\u6cd5\u8be6\u89e3<\/h3>\n<h4>1. static getDerivedStateFromProps(props, state)<\/h4>\n<ul>\n<li>\u8c03\u7528\u65f6\u673a &#xff1a;\u5728\u8c03\u7528render\u65b9\u6cd5\u4e4b\u524d\u8c03\u7528&#xff0c;\u5e76\u4e14\u5728\u521d\u59cb\u6302\u8f7d\u53ca\u540e\u7eed\u66f4\u65b0\u65f6\u90fd\u4f1a\u88ab\u8c03\u7528\u3002<\/li>\n<li>\u8fd4\u56de\u503c &#xff1a;\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\u6765\u66f4\u65b0state&#xff0c;\u5982\u679c\u8fd4\u56denull\u5219\u4e0d\u66f4\u65b0\u4efb\u4f55\u5185\u5bb9\u3002<\/li>\n<li>\u9002\u7528\u573a\u666f &#xff1a;state\u7684\u503c\u5728\u4efb\u4f55\u65f6\u5019\u90fd\u53d6\u51b3\u4e8eprops\u7684\u60c5\u51b5\u3002<\/li>\n<li>\u6ce8\u610f\u4e8b\u9879 &#xff1a;\n<ul>\n<li>\u8fd9\u662f\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5&#xff0c;\u65e0\u6743\u8bbf\u95ee\u7ec4\u4ef6\u5b9e\u4f8b(this)<\/li>\n<li>\u6bcf\u6b21\u6e32\u67d3\u524d\u90fd\u4f1a\u89e6\u53d1&#xff0c;\u800c\u4e0d\u4ec5\u662f\u5728props\u66f4\u6539\u65f6<\/li>\n<li>\u5982\u679c\u9700\u8981\u6267\u884c\u526f\u4f5c\u7528(\u5982\u6570\u636e\u63d0\u53d6\u6216\u52a8\u753b)&#xff0c;\u5e94\u8be5\u4f7f\u7528componentDidUpdate<\/li>\n<li>\u5982\u679c\u53ea\u9700\u8981\u5728prop\u66f4\u6539\u65f6\u91cd\u65b0\u8ba1\u7b97\u67d0\u4e9b\u6570\u636e&#xff0c;\u8003\u8651\u4f7f\u7528memoization helper<\/li>\n<li>\u5982\u679c\u60f3\u5728prop\u66f4\u6539\u65f6&#034;\u91cd\u7f6e&#034;\u67d0\u4e9bstate&#xff0c;\u8003\u8651\u4f7f\u7ec4\u4ef6\u5b8c\u5168\u53d7\u63a7\u6216\u4f7f\u7528key\u4f7f\u7ec4\u4ef6\u5b8c\u5168\u4e0d\u53d7\u63a7<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2. getSnapshotBeforeUpdate(prevProps, prevState)<\/h4>\n<ul>\n<li>\u8c03\u7528\u65f6\u673a &#xff1a;\u5728render\u4e4b\u540e&#xff0c;DOM\u66f4\u65b0\u4e4b\u524d\u8c03\u7528\u3002<\/li>\n<li>\u8fd4\u56de\u503c &#xff1a;\u8fd4\u56de\u4e00\u4e2a\u5feb\u7167\u503c(\u4efb\u4f55\u7c7b\u578b)&#xff0c;\u8be5\u503c\u5c06\u4f5c\u4e3acomponentDidUpdate\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u3002<\/li>\n<li>\u9002\u7528\u573a\u666f &#xff1a;\u9700\u8981\u5728DOM\u66f4\u65b0\u524d\u6355\u83b7\u4e00\u4e9b\u4fe1\u606f(\u5982\u6eda\u52a8\u4f4d\u7f6e)\u7684\u573a\u666f\u3002<\/li>\n<li>\u6ce8\u610f\u4e8b\u9879 &#xff1a;\n<ul>\n<li>\u6b64\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u5fc5\u987b\u4e0ecomponentDidUpdate\u914d\u5408\u4f7f\u7528<\/li>\n<li>\u5178\u578b\u7528\u4f8b\u662f\u5728\u5217\u8868\u6eda\u52a8\u65f6\u4fdd\u6301\u6eda\u52a8\u4f4d\u7f6e<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u516d\u3001\u65b0\u65e7\u751f\u547d\u5468\u671f\u5bf9\u6bd4\u603b\u7ed3<\/h3>\n<h4>\u4e3b\u8981\u53d8\u5316<\/h4>\n<li>\u79fb\u9664\u7684\u65b9\u6cd5 &#xff1a;componentWillMount\u3001componentWillReceiveProps\u3001componentWillUpdate (\u4ecd\u53ef\u4f7f\u7528\u4f46\u6dfb\u52a0\u4e86UNSAFE_\u524d\u7f00)<\/li>\n<li>\u65b0\u589e\u7684\u65b9\u6cd5 &#xff1a;getDerivedStateFromProps\u3001getSnapshotBeforeUpdate<\/li>\n<li>\u4fdd\u7559\u7684\u65b9\u6cd5 &#xff1a;constructor\u3001render\u3001componentDidMount\u3001shouldComponentUpdate\u3001componentDidUpdate\u3001componentWillUnmount<\/li>\n<h4>\u6700\u4f73\u5b9e\u8df5\u5efa\u8bae<\/h4>\n<li>\u6570\u636e\u83b7\u53d6 &#xff1a;\u5e94\u5728componentDidMount\u4e2d\u8fdb\u884c&#xff0c;\u800c\u4e0d\u662fcomponentWillMount<\/li>\n<li>\u72b6\u6001\u6d3e\u751f &#xff1a;\u4f7f\u7528getDerivedStateFromProps\u66ff\u4ee3componentWillReceiveProps<\/li>\n<li>DOM\u64cd\u4f5c\u524d\u51c6\u5907 &#xff1a;\u4f7f\u7528getSnapshotBeforeUpdate\u66ff\u4ee3componentWillUpdate<\/li>\n<li>\u6e05\u7406\u5de5\u4f5c &#xff1a;\u59cb\u7ec8\u5728componentWillUnmount\u4e2d\u8fdb\u884c&#xff0c;\u5982\u6e05\u9664\u5b9a\u65f6\u5668\u3001\u53d6\u6d88\u8ba2\u9605\u7b49<\/li>\n<li>\u6027\u80fd\u4f18\u5316 &#xff1a;\u5408\u7406\u4f7f\u7528shouldComponentUpdate\u6216React.memo\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3<\/li>\n<h4>\u8fc1\u79fb\u7b56\u7565<\/h4>\n<ul>\n<li>\u5bf9\u4e8ecomponentWillMount&#xff1a;\u5c06\u5176\u5185\u5bb9\u79fb\u81f3componentDidMount<\/li>\n<li>\u5bf9\u4e8ecomponentWillReceiveProps&#xff1a;\u4f7f\u7528getDerivedStateFromProps\u66ff\u4ee3<\/li>\n<li>\u5bf9\u4e8ecomponentWillUpdate&#xff1a;\u4f7f\u7528getSnapshotBeforeUpdate\u66ff\u4ee3<\/li>\n<\/ul>\n<h3>\u4e03\u3001\u603b\u7ed3<\/h3>\n<p>React\u751f\u547d\u5468\u671f\u7684\u66f4\u65b0\u53cd\u6620\u4e86React\u56e2\u961f\u5bf9\u5f02\u6b65\u6e32\u67d3\u7684\u91cd\u89c6&#xff0c;\u4ee5\u53ca\u5bf9\u66f4\u5b89\u5168\u3001\u66f4\u53ef\u9884\u6d4b\u7684\u7ec4\u4ef6\u884c\u4e3a\u7684\u8ffd\u6c42\u3002\u867d\u7136\u65e7\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5\u4ecd\u7136\u53ef\u4ee5\u4f7f\u7528(\u5e26\u6709UNSAFE_\u524d\u7f00)&#xff0c;\u4f46\u5efa\u8bae\u65b0\u7684\u9879\u76ee\u91c7\u7528\u65b0\u7684\u751f\u547d\u5468\u671fAPI&#xff0c;\u4ee5\u907f\u514d\u672a\u6765\u53ef\u80fd\u51fa\u73b0\u7684\u517c\u5bb9\u6027\u95ee\u9898\u3002<\/p>\n<p>\u7406\u89e3\u5e76\u6b63\u786e\u4f7f\u7528\u751f\u547d\u5468\u671f\u65b9\u6cd5\u662f\u7f16\u5199\u9ad8\u8d28\u91cfReact\u7ec4\u4ef6\u7684\u5173\u952e\u3002\u65b0\u7684\u751f\u547d\u5468\u671fAPI\u867d\u7136\u589e\u52a0\u4e86\u4e00\u4e9b\u5b66\u4e60\u6210\u672c&#xff0c;\u4f46\u5b83\u4eec\u63d0\u4f9b\u4e86\u66f4\u660e\u786e\u7684\u804c\u8d23\u5212\u5206\u548c\u66f4\u5b89\u5168\u7684\u4f7f\u7528\u65b9\u5f0f&#xff0c;\u6709\u52a9\u4e8e\u6784\u5efa\u66f4\u5065\u58ee\u3001\u66f4\u6613\u4e8e\u7ef4\u62a4\u7684React\u5e94\u7528\u3002<\/p>\n<h3>\u7ecf\u5178\u9762\u8bd5\u9898<\/h3>\n<h4>1.React\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u5206\u4e3a\u54ea\u4e9b\u9636\u6bb5&#xff1f;\u5404\u9636\u6bb5\u5305\u542b\u54ea\u4e9b\u4e3b\u8981\u65b9\u6cd5&#xff1f;<\/h4>\n<p>\u7b54\u6848 &#xff1a; React\u7ec4\u4ef6\u751f\u547d\u5468\u671f\u5206\u4e3a\u4e09\u4e2a\u4e3b\u8981\u9636\u6bb5&#xff1a;<\/p>\n<li>\n<p>\u6302\u8f7d\u9636\u6bb5&#xff08;Mounting&#xff09; &#xff1a;\u7ec4\u4ef6\u4ece\u521b\u5efa\u5230\u9996\u6b21\u6e32\u67d3\u5230DOM\u7684\u8fc7\u7a0b<\/p>\n<ul>\n<li>constructor() &#xff1a;\u521d\u59cb\u5316state\u548c\u7ed1\u5b9a\u4e8b\u4ef6\u5904\u7406\u51fd\u6570<\/li>\n<li>static getDerivedStateFromProps(props, state) &#xff1a;\u6839\u636eprops\u66f4\u65b0state&#xff08;React 16.3&#043;\u65b0\u589e&#xff09;<\/li>\n<li>render() &#xff1a;\u6e32\u67d3\u865a\u62dfDOM<\/li>\n<li>componentDidMount() &#xff1a;\u7ec4\u4ef6\u6302\u8f7d\u540e\u8c03\u7528&#xff0c;\u9002\u5408\u6267\u884c\u526f\u4f5c\u7528\u64cd\u4f5c&#xff08;\u5982\u6570\u636e\u8bf7\u6c42\u3001\u8ba2\u9605\u4e8b\u4ef6&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u66f4\u65b0\u9636\u6bb5&#xff08;Updating&#xff09; &#xff1a;\u7ec4\u4ef6props\u6216state\u53d8\u5316\u65f6\u89e6\u53d1\u7684\u91cd\u65b0\u6e32\u67d3\u8fc7\u7a0b<\/p>\n<ul>\n<li>static getDerivedStateFromProps(props, state) &#xff1a;\u540c\u4e0a<\/li>\n<li>shouldComponentUpdate(nextProps, nextState) &#xff1a;\u51b3\u5b9a\u662f\u5426\u91cd\u65b0\u6e32\u67d3&#xff0c;\u8fd4\u56de\u5e03\u5c14\u503c<\/li>\n<li>render() &#xff1a;\u91cd\u65b0\u6e32\u67d3<\/li>\n<li>getSnapshotBeforeUpdate(prevProps, prevState) &#xff1a;\u5728DOM\u66f4\u65b0\u524d\u83b7\u53d6\u5feb\u7167&#xff08;\u5982\u6eda\u52a8\u4f4d\u7f6e&#xff09;<\/li>\n<li>componentDidUpdate(prevProps, prevState, snapshot) &#xff1a;\u66f4\u65b0\u540e\u8c03\u7528&#xff0c;\u53ef\u6267\u884cDOM\u64cd\u4f5c\u6216\u6570\u636e\u8bf7\u6c42<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5378\u8f7d\u9636\u6bb5&#xff08;Unmounting&#xff09; &#xff1a;\u7ec4\u4ef6\u4eceDOM\u4e2d\u79fb\u9664\u7684\u8fc7\u7a0b<\/p>\n<ul>\n<li>componentWillUnmount() &#xff1a;\u6267\u884c\u6e05\u7406\u64cd\u4f5c&#xff08;\u5982\u53d6\u6d88\u8ba2\u9605\u3001\u6e05\u9664\u5b9a\u65f6\u5668)<\/li>\n<\/ul>\n<\/li>\n<h4>2.React 16.3&#043;\u4e3a\u4ec0\u4e48\u5e9f\u5f03componentWillMount\u3001componentWillReceiveProps\u548ccomponentWillUpdate&#xff1f;\u66ff\u4ee3\u65b9\u6848\u662f\u4ec0\u4e48&#xff1f;<\/h4>\n<p>\u7b54\u6848 &#xff1a; \u5e9f\u5f03\u539f\u56e0 &#xff1a;<\/p>\n<li>\u5f02\u6b65\u6e32\u67d3\u517c\u5bb9\u6027\u95ee\u9898 &#xff1a;React 16\u5f15\u5165Fiber\u67b6\u6784\u652f\u6301\u5f02\u6b65\u6e32\u67d3&#xff0c;\u8fd9\u4e9b\u751f\u547d\u5468\u671f\u53ef\u80fd\u5728\u6e32\u67d3\u8fc7\u7a0b\u4e2d\u88ab\u591a\u6b21\u8c03\u7528&#xff0c;\u5bfc\u81f4\u526f\u4f5c\u7528&#xff08;\u5982\u6570\u636e\u8bf7\u6c42&#xff09;\u91cd\u590d\u6267\u884c \u3002<\/li>\n<li>\u526f\u4f5c\u7528\u7ba1\u7406\u98ce\u9669 &#xff1a;\u5f00\u53d1\u8005\u5e38\u5728\u6b64\u7c7b\u65b9\u6cd5\u4e2d\u6267\u884c\u6570\u636e\u8bf7\u6c42\u6216\u72b6\u6001\u66f4\u65b0&#xff0c;\u53ef\u80fd\u5bfc\u81f4\u4e0d\u53ef\u9884\u6d4b\u7684\u6e32\u67d3\u7ed3\u679c \u3002<\/li>\n<li>API\u7b80\u5316 &#xff1a;\u65b0\u751f\u547d\u5468\u671f\u63d0\u4f9b\u66f4\u660e\u786e\u7684\u804c\u8d23\u5212\u5206&#xff0c;\u907f\u514d\u6ee5\u7528\u3002<\/li>\n<p>\u66ff\u4ee3\u65b9\u6848 &#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250810030157-68980ba5043bd.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u793a\u4f8b\u4ee3\u7801 &#xff1a;<\/p>\n<p>\/\/ \u66ff\u4ee3componentWillReceiveProps\u7684\u9759\u6001\u65b9\u6cd5<br \/>\n\/\/ \u4f5c\u7528&#xff1a;\u6839\u636e\u65b0\u4f20\u5165\u7684props\u8ba1\u7b97\u5e76\u8fd4\u56de\u65b0\u7684state<br \/>\n\/\/ \u6ce8\u610f&#xff1a;\u8fd9\u662f\u9759\u6001\u65b9\u6cd5&#xff0c;\u4e0d\u80fd\u4f7f\u7528this\u5173\u952e\u5b57&#xff0c;\u5fc5\u987b\u8fd4\u56de\u5bf9\u8c61\u6216null<br \/>\nstatic getDerivedStateFromProps(nextProps, prevState) {<br \/>\n  \/\/ \u6bd4\u8f83\u65b0props\u4e2d\u7684userId\u4e0e\u5f53\u524dstate\u4e2d\u7684userId\u662f\u5426\u4e0d\u540c<br \/>\n  if (nextProps.userId !&#061;&#061; prevState.userId) {<br \/>\n    \/\/ \u5982\u679c\u4e0d\u540c&#xff0c;\u8fd4\u56de\u65b0\u7684state\u5bf9\u8c61\u66f4\u65b0userId<br \/>\n    return { userId: nextProps.userId };<br \/>\n  }<br \/>\n  \/\/ \u5982\u679c\u76f8\u540c&#xff0c;\u8fd4\u56denull\u8868\u793a\u4e0d\u9700\u8981\u66f4\u65b0state<br \/>\n  return null;<br \/>\n}<\/p>\n<p>\/\/ \u7ec4\u4ef6\u66f4\u65b0\u5b8c\u6210\u540e\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5<br \/>\n\/\/ \u4f5c\u7528&#xff1a;\u6267\u884c\u4f9d\u8d56\u4e8eDOM\u66f4\u65b0\u7684\u526f\u4f5c\u7528\u64cd\u4f5c&#xff08;\u5982\u6570\u636e\u8bf7\u6c42\u3001DOM\u64cd\u4f5c&#xff09;<br \/>\n\/\/ \u53c2\u6570prevProps&#xff1a;\u66f4\u65b0\u524d\u7684props<br \/>\ncomponentDidUpdate(prevProps) {<br \/>\n  \/\/ \u6bd4\u8f83\u5f53\u524dprops\u4e0e\u66f4\u65b0\u524d\u7684props\u4e2d\u7684userId\u662f\u5426\u4e0d\u540c<br \/>\n  if (this.props.userId !&#061;&#061; prevProps.userId) {<br \/>\n    \/\/ \u5982\u679c\u4e0d\u540c&#xff0c;\u8c03\u7528\u6570\u636e\u8bf7\u6c42\u65b9\u6cd5\u83b7\u53d6\u65b0\u7528\u6237\u6570\u636e<br \/>\n    this.fetchUserData(this.props.userId); \/\/ \u526f\u4f5c\u7528\u64cd\u4f5c&#xff08;\u6570\u636e\u8bf7\u6c42\u3001\u8ba2\u9605\u7b49&#xff09;<br \/>\n  }<br \/>\n}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb371\u6b21\u3002React\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u662f\u6307\u7ec4\u4ef6\u4ece\u521b\u5efa\u5230\u5378\u8f7d\u7684\u6574\u4e2a\u8fc7\u7a0b\uff0c\u5b83\u63d0\u4f9b\u4e86\u591a\u4e2a\u94a9\u5b50\u51fd\u6570\u8ba9\u5f00\u53d1\u8005\u80fd\u591f\u5728\u4e0d\u540c\u9636\u6bb5\u6267\u884c\u7279\u5b9a\u64cd\u4f5c\u3002\u968f\u7740React\u7248\u672c\u7684\u8fed\u4ee3\uff0c\u751f\u547d\u5468\u671fAPI\u53d1\u751f\u4e86\u91cd\u8981\u53d8\u5316\uff0c\u5c24\u5176\u662f\u5728React 16.3\u7248\u672c\u4e2d\u5f15\u5165\u4e86\u65b0\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5\uff0c\u540c\u65f6\u6807\u8bb0\u4e86\u90e8\u5206\u65e7\u65b9\u6cd5\u4e3a\u4e0d\u5b89\u5168(UNSAFE\\\\_)\u3002<\/p>\n","protected":false},"author":2,"featured_media":50600,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[722,187,524,4940],"topic":[],"class_list":["post-50605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-ecmascript","tag-javascript","tag-react-js","tag-react"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4e3a\u4ec0\u4e48 React \u8981 \u201c\u6dd8\u6c70\u201d \u65e7\u751f\u547d\u5468\u671f\uff1f\u4ece\u539f\u7406\u5230\u5b9e\u8df5\uff0c\u4e00\u6587\u8bfb\u61c2\u94a9\u5b50\u51fd\u6570\u7684\u8fed\u4ee3\u903b\u8f91 - 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content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb371\u6b21\u3002React\u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u662f\u6307\u7ec4\u4ef6\u4ece\u521b\u5efa\u5230\u5378\u8f7d\u7684\u6574\u4e2a\u8fc7\u7a0b\uff0c\u5b83\u63d0\u4f9b\u4e86\u591a\u4e2a\u94a9\u5b50\u51fd\u6570\u8ba9\u5f00\u53d1\u8005\u80fd\u591f\u5728\u4e0d\u540c\u9636\u6bb5\u6267\u884c\u7279\u5b9a\u64cd\u4f5c\u3002\u968f\u7740React\u7248\u672c\u7684\u8fed\u4ee3\uff0c\u751f\u547d\u5468\u671fAPI\u53d1\u751f\u4e86\u91cd\u8981\u53d8\u5316\uff0c\u5c24\u5176\u662f\u5728React 16.3\u7248\u672c\u4e2d\u5f15\u5165\u4e86\u65b0\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5\uff0c\u540c\u65f6\u6807\u8bb0\u4e86\u90e8\u5206\u65e7\u65b9\u6cd5\u4e3a\u4e0d\u5b89\u5168(UNSAFE\\_)\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/50605.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-10T03:01:58+00:00\" 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