{"id":2431,"date":"2024-11-10T13:16:20","date_gmt":"2024-11-10T05:16:20","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2431\/"},"modified":"2024-11-10T13:16:20","modified_gmt":"2024-11-10T05:16:20","slug":"%e9%80%9a%e8%bf%87%e8%ae%b0%e5%bf%86%e5%8c%96%e6%8f%90%e9%ab%98-react-%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e7%9a%84%e6%80%a7%e8%83%bd%ef%bc%9a%e6%8e%a2%e7%b4%a2-usememo%e3%80%81usecallback-%e5%92%8c-r","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2431\/","title":{"rendered":"\u901a\u8fc7\u8bb0\u5fc6\u5316\u63d0\u9ad8 React \u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff1a\u63a2\u7d22 useMemo\u3001useCallback \u548c Reactmemo"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173076588350827.jpg\" class=\"aligncenter\" title=\"\u901a\u8fc7\u8bb0\u5fc6\u5316\u63d0\u9ad8 React \u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff1a\u63a2\u7d22 useMemo\u3001useCallback \u548c Reactmemo\u63d2\u56fe\" alt=\"\u901a\u8fc7\u8bb0\u5fc6\u5316\u63d0\u9ad8 React \u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff1a\u63a2\u7d22 useMemo\u3001useCallback \u548c Reactmemo\u63d2\u56fe\" \/><\/p>\n<p>\u63d0\u9ad8\u7f51\u7ad9\u6027\u80fd\u662f\u589e\u5f3a\u7528\u6237\u4f53\u9a8c\u548c\u786e\u4fdd\u53ef\u9760\u3001\u54cd\u5e94\u7075\u654f\u7684\u754c\u9762\u7684\u5173\u952e\u4e00\u6b65\u3002\u5982\u679c\u60a8\u6b63\u5728\u5f00\u53d1\u5305\u542b\u4e00\u4e9b\u8d44\u6e90\u5bc6\u96c6\u578b\u7ec4\u4ef6\u7684 react \u6216 next.js \u9879\u76ee\uff0c\u90a3\u4e48\u5f88\u81ea\u7136\u4f1a\u62c5\u5fc3\u5b83\u4eec\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u3002\u8fd9\u5c31\u662f react \u4e2d\u7684\u8bb0\u5fc6\u5316\u7684\u7528\u6b66\u4e4b\u5730\u2014\u2014\u5b83\u6709\u52a9\u4e8e\u52a0\u5feb\u8fd9\u4e9b\u201c\u6602\u8d35\u201d\u7ec4\u4ef6\u7684\u901f\u5ea6\uff0c\u4ece\u800c\u4e3a\u7528\u6237\u5e26\u6765\u66f4\u6d41\u7545\u7684\u4f53\u9a8c\u3002<\/p>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5c06\u4ecb\u7ecd\u8bb0\u5fc6\u5316\u5e76\u4ecb\u7ecd\u53ef\u4ee5\u4f18\u5316\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u7684 react hooks\uff0c\u4f8b\u5982 usememo()\u3001usecallback() \u548c react.memo \u9ad8\u9636\u7ec4\u4ef6 (hoc)\u3002\u8ba9\u6211\u4eec\u5f00\u59cb\u5427\uff01<\/p>\n<h2> react \u4e2d\u7684\u8bb0\u5fc6\u5316\u662f\u4ec0\u4e48\uff1f <\/h2>\n<p>\u8bb0\u5fc6\u5316\u662f\u4e00\u79cd\u901a\u8fc7\u7f13\u5b58\u8ba1\u7b97\u4efb\u52a1\uff08\u4f8b\u5982\u51fd\u6570\u8c03\u7528\uff09\u7684\u7ed3\u679c\u6765\u52a0\u901f\u7a0b\u5e8f\u7684\u6280\u672f\uff0c\u8fd9\u6837\uff0c\u5982\u679c\u518d\u6b21\u63d0\u4f9b\u76f8\u540c\u7684\u8f93\u5165\uff0c\u5219\u8fd4\u56de\u7f13\u5b58\u7684\u7ed3\u679c\u800c\u4e0d\u662f\u91cd\u65b0\u8ba1\u7b97\u5b83\u3002<\/p>\n<h2> usememo hook\uff1a\u5728 react \u4e2d\u7f13\u5b58\u7ed3\u679c <\/h2>\n<p>usememo \u662f\u4e00\u4e2a\u94a9\u5b50\uff0c\u53ef\u4ee5\u5728\u91cd\u65b0\u6e32\u67d3\u6216\u66f4\u65b0\u7ec4\u4ef6\u4e4b\u95f4\u7f13\u5b58\u6216\u8bb0\u5fc6\u51fd\u6570\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u901a\u8fc7\u4f7f\u7528\u6b64\u94a9\u5b50\uff0c\u60a8\u53ef\u4ee5\u7f13\u5b58\u7ec4\u4ef6\u4e2d\u51fd\u6570\u7684\u7ed3\u679c\uff0c\u5e76\u4e14\u5728\u4e0b\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u5982\u679c\u8be5\u51fd\u6570\u7684\u8f93\u5165\u672a\u66f4\u6539\uff0c\u60a8\u7684\u7ec4\u4ef6\u5c06\u4f7f\u7528\u7f13\u5b58\u7ed3\u679c\u3002<\/p>\n<h3> \u5982\u4f55\u5b9e\u73b0 usememo\uff1a <\/h3>\n<p>usememo \u662f\u4e00\u4e2a\u6302\u94a9\uff0c\u5b83\u5c06\u672a\u4f18\u5316\u7684\u51fd\u6570\u4f5c\u4e3a\u56de\u8c03\u548c\u4f9d\u8d56\u9879\u5217\u8868\u3002\u7136\u540e react \u51b3\u5b9a\u4f55\u65f6\u5728\u521d\u59cb\u6e32\u67d3\u671f\u95f4\u6216\u540e\u7eed\u91cd\u65b0\u6e32\u67d3\u65f6\u8c03\u7528\u6b64\u51fd\u6570\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u521d\u59cb\u6e32\u67d3<\/strong>\uff1a\u5728\u521d\u59cb\u6e32\u67d3\u671f\u95f4\uff0creact \u4f1a\u8c03\u7528 usememo \u51fd\u6570\u6765\u8ba1\u7b97\u5e76\u5b58\u50a8\u60a8\u63d0\u4f9b\u7684\u56de\u8c03\u51fd\u6570\u7684\u7ed3\u679c\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u91cd\u65b0\u6e32\u67d3<\/strong>\uff1a\u91cd\u65b0\u6e32\u67d3\u65f6\uff0creact \u8c03\u7528 usememo \u6765\u68c0\u67e5\u4f9d\u8d56\u9879\u662f\u5426\u5df2\u66f4\u6539\u3002\u5982\u679c\u4f9d\u8d56\u9879\u6ca1\u6709\u66f4\u6539\uff0creact \u4f1a\u91cd\u7528\u4e0a\u6b21\u6e32\u67d3\u671f\u95f4\u5b58\u50a8\u7684\u7f13\u5b58\u503c\u3002\u4f46\u662f\uff0c\u5982\u679c\u4f9d\u8d56\u9879\u53d1\u751f\u4e86\u53d8\u5316\uff0cusememo \u4f1a\u518d\u6b21\u8c03\u7528\u56de\u8c03\u51fd\u6570\u6765\u91cd\u65b0\u8ba1\u7b97\u66f4\u65b0\u540e\u7684\u503c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u7f13\u5b58\u4e2d\u3002<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>import react, { usememo } from 'react';\n\nconst mycomponent = ({ number }) =&gt; {\n  const squarednumber = usememo(() =&gt; number * number, [number]);\n\n  return &lt;div&gt;squared number: {squarednumber}&lt;\/div&gt;;\n};\n\n<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>squarednumber \u4ec5\u5f53\u6570\u5b57\u53d1\u751f\u53d8\u5316\u65f6\u624d\u8ba1\u7b97\u3002 usememo \u4f1a\u7f13\u5b58\u6b64\u8ba1\u7b97\uff0c\u56e0\u6b64\u4e0d\u4f1a\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u8ba1\u7b97\u3002<\/p>\n<h2> usecallback hook\uff1a\u7f13\u5b58\u51fd\u6570\u5b9a\u4e49 <\/h2>\n<p>usecallback \u662f\u4e00\u4e2a\u94a9\u5b50\uff0c\u7528\u4e8e\u7f13\u5b58\u6216\u8bb0\u5fc6\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u6216\u66f4\u65b0\u4e4b\u95f4\u7684\u51fd\u6570\u5b9a\u4e49\u3002<\/p>\n<p>\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u94a9\u5b50\uff0c\u4f60\u53ef\u4ee5\u5728\u91cd\u65b0\u6e32\u67d3\u65f6\u5b58\u50a8\u51fd\u6570\u7684\u5b9a\u4e49\uff0c\u56e0\u6b64\u53ea\u8981\u51fd\u6570\u7684\u4f9d\u8d56\u9879\u6ca1\u6709\u6539\u53d8\uff0creact\u5c31\u4f1a\u91cd\u7528\u8fd9\u4e2a\u7f13\u5b58\u7684\u7248\u672c\u3002<\/p>\n<h3> \u5982\u4f55\u5b9e\u73b0usecallback\uff1a <\/h3>\n<p>usecallback \u662f\u4e00\u4e2a\u6302\u94a9\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u51fd\u6570\uff08\u4f5c\u4e3a\u56de\u8c03\uff09\u548c\u4e00\u4e2a\u4f9d\u8d56\u9879\u5217\u8868\u3002\u7136\u540e\uff0creact \u51b3\u5b9a\u4f55\u65f6\u8fd4\u56de\uff08\u800c\u4e0d\u662f\u8c03\u7528\uff09\u6b64\u51fd\u6570 &#8211; \u65e0\u8bba\u662f\u5728\u521d\u59cb\u6e32\u67d3\u671f\u95f4\u8fd8\u662f\u5728\u540e\u7eed\u91cd\u65b0\u6e32\u67d3\u671f\u95f4\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u521d\u59cb\u6e32\u67d3<\/strong>\uff1a\u5728\u521d\u59cb\u6e32\u67d3\u671f\u95f4\uff0creact \u8c03\u7528 usecallback \u6765\u5b58\u50a8\u60a8\u4f5c\u4e3a\u56de\u8c03\u4f20\u9012\u7684\u51fd\u6570\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u91cd\u65b0\u6e32\u67d3<\/strong>\uff1a\u91cd\u65b0\u6e32\u67d3\u65f6\uff0creact \u8c03\u7528 usecallback \u6765\u68c0\u67e5\u4f9d\u8d56\u9879\u662f\u5426\u5df2\u66f4\u6539\u3002\u5982\u679c\u4f9d\u8d56\u9879\u6ca1\u6709\u66f4\u6539\uff0creact \u4f1a\u91cd\u7528\u4e0a\u6b21\u6e32\u67d3\u671f\u95f4\u5b58\u50a8\u7684\u7f13\u5b58\u51fd\u6570\u3002\u5982\u679c\u4f9d\u8d56\u9879\u53d1\u751f\u66f4\u6539\uff0cusecallback \u5c06\u5b58\u50a8\u5e76\u8fd4\u56de\u66f4\u65b0\u540e\u7684\u51fd\u6570\u3002<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>import react, { usestate, usecallback } from 'react';\n\nconst mycomponent = () =&gt; {\n  const [count, setcount] = usestate(0);\n  const [multiplier, setmultiplier] = usestate(2);\n\n  \/\/ memoize the callback with `count` as a dependency\n  const calculate = usecallback(() =&gt; {\n    console.log(\"calculating:\", count * multiplier);\n  }, [count]);\n\n  return (\n    &lt;div&gt;\n      &lt;p&gt;count: {count}&lt;\/p&gt;\n      &lt;p&gt;multiplier: {multiplier}&lt;\/p&gt;\n      &lt;button onclick={() =&gt; setcount(count + 1)}&gt;increment count&lt;\/button&gt;\n      &lt;button onclick={() =&gt; setmultiplier(multiplier + 1)}&gt;increment multiplier&lt;\/button&gt;\n      &lt;button onclick={calculate}&gt;calculate&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n};\n\nexport default mycomponent;\n\n<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<h2> react.memo \u51fd\u6570\uff1a\u9632\u6b62\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3 <\/h2>\n<p>\u6b63\u5982\u4f60\u6240\u77e5\uff0c\u5f53\u4f60\u6709\u7236\u7ec4\u4ef6\u548c\u5b50\u7ec4\u4ef6\u65f6\uff0c\u5bf9\u7236\u7ec4\u4ef6\u7684 state \u6216 props \u7684\u4efb\u4f55\u66f4\u65b0\u90fd\u4f1a\u5bfc\u81f4\u5176\u6240\u6709\u5b50\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u3002\u5728\u5c0f\u578b\u9879\u76ee\u4e2d\uff0c\u8fd9\u53ef\u80fd\u4e0d\u662f\u95ee\u9898\uff0c\u4f46\u5728\u66f4\u5927\u3001\u66f4\u590d\u6742\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5b50\u7ec4\u4ef6\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0creact \u63d0\u4f9b\u4e86 memo() \u51fd\u6570\u3002<\/p>\n<p>memo\uff08\u6216 react.memo\uff09\u51fd\u6570\u5141\u8bb8\u60a8\u5305\u88c5\u7ec4\u4ef6\u4ee5\u9632\u6b62\u5176\u5728\u7236\u7ea7\u66f4\u65b0\u65f6\u91cd\u65b0\u6e32\u67d3\u3002\u88ab\u5305\u88c5\u7684\u7ec4\u4ef6\u53ea\u6709\u5728\u5176\u81ea\u8eab\u7684 props \u6216 state \u6539\u53d8\u65f6\u624d\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u5f53\u4f60\u7b2c\u4e00\u6b21\u5728\u7ec4\u4ef6\u4e0a\u8c03\u7528 memo() \u65f6\uff0creact \u4f1a\u6e32\u67d3\u5e76\u7f13\u5b58\u8be5\u7ec4\u4ef6\u3002\u5728\u540e\u7eed\u6e32\u67d3\u4e2d\uff0c\u53ea\u8981\u7ec4\u4ef6\u7684 props \u548c\u72b6\u6001\u6ca1\u6709\u6539\u53d8\uff0creact \u5c31\u4f1a\u4f7f\u7528\u8fd9\u4e2a\u7f13\u5b58\u7684\u7248\u672c\u3002\u8bf7\u8bb0\u4f4f\uff0cmemo() \u4ec5\u907f\u514d\u91cd\u65b0\u6e32\u67d3\u672a\u66f4\u6539\u7684 props \u548c\u72b6\u6001 &#8211; \u4e00\u65e6\u5b83\u4eec\u53d1\u751f\u66f4\u6539\uff0cmemo() \u5c31\u4f1a\u76f8\u5e94\u5730\u91cd\u65b0\u6e32\u67d3\u5e76\u66f4\u65b0\u7f13\u5b58\u7684\u7ec4\u4ef6\u3002<\/p>\n<h3> \u5982\u4f55\u5b9e\u73b0 react.memo\uff1a <\/h3>\n<p>\u8981\u5728\u7ec4\u4ef6\u4e2d\u5b9e\u73b0 memo\uff0c\u53ea\u9700\u4f7f\u7528 memo() \u6216 react.memo() \u5305\u88c5\u60a8\u60f3\u8981\u9632\u6b62\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u7684\u7ec4\u4ef6\uff1a<\/p>\n<pre>import react from 'react';\n\nconst mycomponent = ({ data }) =&gt; {\n  return &lt;div&gt;{data.value}&lt;\/div&gt;;\n};\n\nexport default react.memo(mycomponent);\n\n<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u6ce8\u610f\uff1a<br \/> \u5982\u679c\u5c06\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a prop \u4f20\u9012\u7ed9\u5305\u88c5\u5728 memo() \u4e2d\u7684\u7ec4\u4ef6\uff0c\u5219\u5373\u4f7f\u8be5\u5bf9\u8c61\u6ca1\u6709\u66f4\u6539\uff0c\u8be5\u7ec4\u4ef6\u4ecd\u5c06\u5728\u6bcf\u6b21\u66f4\u65b0\u65f6\u91cd\u65b0\u6e32\u67d3\u3002\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\u662f\u56e0\u4e3a react \u4f7f\u7528 object.is \u6765\u6bd4\u8f83\u5148\u524d\u548c\u5f53\u524d\u7684 props\u3002\u867d\u7136 object.is(3, 3) \u8fd4\u56de true\uff0c\u4f46 object.is({}, {}) \u8fd4\u56de false\uff0c\u56e0\u4e3a\u4e24\u4e2a\u4e0d\u540c\u7684\u5bf9\u8c61\u5f15\u7528\u6c38\u8fdc\u4e0d\u4f1a\u88ab\u89c6\u4e3a\u76f8\u7b49\u3002<\/p>\n<p>\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 usememo \u6765\u7f13\u5b58\u5bf9\u8c61\u5e76\u5728\u6e32\u67d3\u4e4b\u95f4\u4fdd\u6301\u76f8\u540c\u7684\u5f15\u7528\uff1a<\/p>\n<pre>import React, { useMemo } from 'react';\nimport MyComponent from '.\/MyComponent';\n\nconst ParentComponent = () =&gt; {\n  const data = useMemo(() =&gt; ({ value: \"Hello\" }), []); \/\/ Cached object reference\n  return &lt;MyComponent data={data} \/&gt;;\n};\n\n<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u5728\u6b64\u793a\u4f8b\u4e2d\uff0cusememo \u786e\u4fdd\u6570\u636e\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u7684\u5f15\u7528\uff0c\u4ece\u800c\u9632\u6b62 mycomponent \u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u611f\u8c22\u60a8\u9605\u8bfb\u6211\u7684\u6587\u7ae0\uff01\u5982\u679c\u60a8\u60f3\u4e86\u89e3\u6709\u5173 next.js\u3001react\u3001javascript \u7b49\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u968f\u65f6\u5173\u6ce8\u6211\u7684\u7f51\u7ad9\uff1asaeed-niyabati.ir\u3002\u5982\u6709\u4efb\u4f55\u95ee\u9898\uff0c\u8bf7\u968f\u65f6\u4e0e\u6211\u4eec\u8054\u7cfb\u3002\u4e0b\u6b21\u89c1\uff01<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u901a\u8fc7\u8bb0\u5fc6\u5316\u63d0\u9ad8 React \u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff1a\u63a2\u7d22 useMemo\u3001useCallback \u548c Reactmemo\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63d0\u9ad8\u7f51\u7ad9\u6027\u80fd\u662f\u589e\u5f3a\u7528\u6237\u4f53\u9a8c\u548c\u786e\u4fdd\u53ef\u9760\u3001\u54cd\u5e94\u7075\u654f\u7684\u754c\u9762\u7684\u5173\u952e\u4e00\u6b65\u3002\u5982\u679c\u60a8\u6b63\u5728\u5f00\u53d1\u5305\u542b\u4e00\u4e9b\u8d44\u6e90\u5bc6\u96c6\u578b\u7ec4\u4ef6\u7684 react \u6216 next.js \u9879\u76ee\uff0c\u90a3\u4e48\u5f88\u81ea\u7136\u4f1a\u62c5\u5fc3\u5b83\u4eec\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u3002\u8fd9\u5c31\u662f react \u4e2d\u7684\u8bb0\u5fc6\u5316\u7684\u7528\u6b66\u4e4b\u5730\u2014\u2014\u5b83\u6709\u52a9\u4e8e\u52a0\u5feb\u8fd9\u4e9b\u201c\u6602\u8d35\u201d\u7ec4\u4ef6\u7684\u901f\u5ea6\uff0c\u4ece\u800c\u4e3a\u7528\u6237\u5e26\u6765\u66f4\u6d41\u7545\u7684\u4f53\u9a8c\u3002 \u5728\u672c\u6587\u4e2d\uff0c\u6211\u5c06\u4ecb\u7ecd\u8bb0\u5fc6\u5316\u5e76\u4ecb\u7ecd\u53ef\u4ee5\u4f18\u5316\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u7684 react hooks\uff0c\u4f8b\u5982 usememo()\u3001usecallback() \u548c react.memo \u9ad8\u9636\u7ec4\u4ef6 (hoc)\u3002\u8ba9\u6211\u4eec\u5f00\u59cb\u5427\uff01 react \u4e2d\u7684\u8bb0\u5fc6\u5316\u662f\u4ec0\u4e48\uff1f \u8bb0\u5fc6\u5316\u662f\u4e00\u79cd\u901a\u8fc7\u7f13\u5b58\u8ba1\u7b97\u4efb\u52a1\uff08\u4f8b\u5982\u51fd\u6570\u8c03\u7528\uff09\u7684\u7ed3\u679c\u6765\u52a0\u901f\u7a0b\u5e8f\u7684\u6280\u672f\uff0c\u8fd9\u6837\uff0c\u5982\u679c\u518d\u6b21\u63d0\u4f9b\u76f8\u540c\u7684\u8f93\u5165\uff0c\u5219\u8fd4\u56de\u7f13\u5b58\u7684\u7ed3\u679c\u800c\u4e0d\u662f\u91cd\u65b0\u8ba1\u7b97\u5b83\u3002 usememo hook\uff1a\u5728 react \u4e2d\u7f13\u5b58\u7ed3\u679c usememo \u662f\u4e00\u4e2a\u94a9\u5b50\uff0c\u53ef\u4ee5\u5728\u91cd\u65b0\u6e32\u67d3\u6216\u66f4\u65b0\u7ec4\u4ef6\u4e4b\u95f4\u7f13\u5b58\u6216\u8bb0\u5fc6\u51fd\u6570\u7684\u7ed3\u679c\u3002 \u56e0\u6b64\uff0c\u901a\u8fc7\u4f7f\u7528\u6b64\u94a9\u5b50\uff0c\u60a8\u53ef\u4ee5\u7f13\u5b58\u7ec4\u4ef6\u4e2d\u51fd\u6570\u7684\u7ed3\u679c\uff0c\u5e76\u4e14\u5728\u4e0b\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u5982\u679c\u8be5\u51fd\u6570\u7684\u8f93\u5165\u672a\u66f4\u6539\uff0c\u60a8\u7684\u7ec4\u4ef6\u5c06\u4f7f\u7528\u7f13\u5b58\u7ed3\u679c\u3002 \u5982\u4f55\u5b9e\u73b0 usememo\uff1a usememo \u662f\u4e00\u4e2a\u6302\u94a9\uff0c\u5b83\u5c06\u672a\u4f18\u5316\u7684\u51fd\u6570\u4f5c\u4e3a\u56de\u8c03\u548c\u4f9d\u8d56\u9879\u5217\u8868\u3002\u7136\u540e react \u51b3\u5b9a\u4f55\u65f6\u5728\u521d\u59cb\u6e32\u67d3\u671f\u95f4\u6216\u540e\u7eed\u91cd\u65b0\u6e32\u67d3\u65f6\u8c03\u7528\u6b64\u51fd\u6570\u3002 \u521d\u59cb\u6e32\u67d3\uff1a\u5728\u521d\u59cb\u6e32\u67d3\u671f\u95f4\uff0creact \u4f1a\u8c03\u7528 usememo \u51fd\u6570\u6765\u8ba1\u7b97\u5e76\u5b58\u50a8\u60a8\u63d0\u4f9b\u7684\u56de\u8c03\u51fd\u6570\u7684\u7ed3\u679c\u3002 \u91cd\u65b0\u6e32\u67d3\uff1a\u91cd\u65b0\u6e32\u67d3\u65f6\uff0creact \u8c03\u7528 usememo \u6765\u68c0\u67e5\u4f9d\u8d56\u9879\u662f\u5426\u5df2\u66f4\u6539\u3002\u5982\u679c\u4f9d\u8d56\u9879\u6ca1\u6709\u66f4\u6539\uff0creact \u4f1a\u91cd\u7528\u4e0a\u6b21\u6e32\u67d3\u671f\u95f4\u5b58\u50a8\u7684\u7f13\u5b58\u503c\u3002\u4f46\u662f\uff0c\u5982\u679c\u4f9d\u8d56\u9879\u53d1\u751f\u4e86\u53d8\u5316\uff0cusememo \u4f1a\u518d\u6b21\u8c03\u7528\u56de\u8c03\u51fd\u6570\u6765\u91cd\u65b0\u8ba1\u7b97\u66f4\u65b0\u540e\u7684\u503c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u7f13\u5b58\u4e2d\u3002 \u793a\u4f8b\uff1a import react, { usememo } from &#8216;react&#8217;; const mycomponent = ({ number }) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-2431","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2431","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=2431"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2431\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=2431"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=2431"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=2431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}