{"id":38213,"date":"2022-12-03T07:44:20","date_gmt":"2023-04-10T18:22:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8react-memo%ef%bc%8cusecallback%e5%92%8creact-usememo%e6%9d%a5%e4%bc%98%e5%8c%96%e6%b8%b2%e6%9f%93\/"},"modified":"2024-04-29T03:33:21","modified_gmt":"2024-04-28T19:33:21","slug":"%e4%bd%bf%e7%94%a8react-memo%ef%bc%8cusecallback%e5%92%8creact-usememo%e6%9d%a5%e4%bc%98%e5%8c%96%e6%b8%b2%e6%9f%93","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8react-memo%ef%bc%8cusecallback%e5%92%8creact-usememo%e6%9d%a5%e4%bc%98%e5%8c%96%e6%b8%b2%e6%9f%93\/","title":{"rendered":"\u4f7f\u7528React.memo\uff0cuseCallback\u548cReact.useMemo\u6765\u4f18\u5316\u6e32\u67d3"},"content":{"rendered":"

\u5728\u6e32\u67d3\u4f18\u5316\u4e2d\u4f7f\u7528memo\u3001useCallback\u548cReact.useMemo\u8fdb\u884c\u4f18\u5316\u3002<\/h1>\n

\u5728React\u5f00\u53d1\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u6ce8\u610f\u91cd\u65b0\u6e32\u67d3\u7684\u95ee\u9898\u6765\u63d0\u9ad8\u6027\u80fd\u3002\u4e3a\u4e86\u63a7\u5236\u91cd\u65b0\u6e32\u67d3\uff0c\u53ef\u4ee5\u4f7f\u7528\u7f13\u5b58\u6280\u672f\uff0c\u5305\u62ecReact.memo\u3001useCallback\u548cReact.useMemo\u3002<\/p>\n

\u5907\u5fd8\u5f55\u7c7b\u578b<\/h2>\n

\u901a\u8fc7\u5bf9React\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u53ef\u4ee5\u63a7\u5236\u548c\u4f18\u5316\u91cd\u65b0\u6e32\u67d3\u3002
\n\u8bb0\u5fc6\u5316\u662f\u901a\u8fc7\u4fdd\u7559\u4e0a\u6b21\u7684\u5904\u7406\u7ed3\u679c\u6765\u52a0\u5feb\u5904\u7406\u901f\u5ea6\u3002<\/p>\n

\n
\u7a2e\u985e\u5bfe\u8c61React.memo\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8useCallback\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570React.useMemo\u5909\u6570<\/div>\n<\/div>\n

\u518d\u6e32\u67d3\u53d1\u751f\u7684\u6761\u4ef6\u3002<\/h2>\n
    \n
  1. \n
      \u88ab State \u66f4\u65b0\u7684\u7ec4\u4ef6<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \u88ab Prop \u66f4\u65b0\u7684\u7ec4\u4ef6<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \u88ab\u91cd\u65b0\u6e32\u67d3\u7684\u7ec4\u4ef6\u4e0b\u7684\u6240\u6709\u7ec4\u4ef6<\/ol>\n

            \u8ba9\u6211\u4eec\u5c1d\u8bd5\u91cd\u65b0\u6e32\u67d3<\/h3>\n
            import<\/span> ReactDom<\/span> from<\/span> \"<\/span>react-dom<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> App<\/span> }<\/span> from<\/span> \"<\/span>.\/App<\/span>\"<\/span>;<\/span>\r\n\r\nReactDom<\/span>.<\/span>render<\/span>(<\/span><<\/span>App<\/span> \/><\/span>,<\/span> document<\/span>.<\/span>getElementById<\/span>(<\/span>\"<\/span>root<\/span>\"<\/span>));<\/span>\r\n);<\/span>\r\n\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> useState<\/span>,<\/span> useCallback<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child1<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child1<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child4<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child4<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>App \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  const<\/span> [<\/span>num<\/span>,<\/span> setNum<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  const<\/span> onClickButton<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setNum<\/span>(<\/span>num<\/span> +<\/span> 1<\/span>);<\/span>\r\n  };<\/span>\r\n\r\n  const<\/span> onClickReset<\/span> =<\/span> useCallback<\/span>(()<\/span> =><\/span> {<\/span>\r\n    setNum<\/span>(<\/span>0<\/span>);<\/span>\r\n  },<\/span> []);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onClickButton<\/span>}<\/span>><\/span>\u30dc\u30bf\u30f3<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>num<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>Child1<\/span> onClickReset<\/span>=<\/span>{<\/span>onClickReset<\/span>}<\/span> \/><\/span>\r\n      <<\/span>Child4<\/span> \/><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> Child2<\/span> }<\/span> from<\/span> \"<\/span>.\/Child2<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child3<\/span> }<\/span> from<\/span> \"<\/span>.\/Child3<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#AAFFFF <\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child1<\/span> =<\/span> (<\/span>props<\/span>)<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child1 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  const<\/span> {<\/span> onClickReset<\/span> }<\/span> =<\/span> props<\/span>;<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child1<\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onClickReset<\/span>}<\/span>><\/span>\u30ea\u30bb\u30c3\u30c8<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>Child2<\/span> \/><\/span>\r\n      <<\/span>Child3<\/span> \/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\n<\/code><\/pre>\n
            const<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#FFCCFF<\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child2<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child2 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child2<\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            const<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#FFCCFF<\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child3<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child3 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child3<\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            const<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#66FF00<\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child4<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child4 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child4<\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            \"FireShot<\/div>\n
            \u5728\u4e0a\u8ff0\u4ee3\u7801\u6267\u884c\u4e4b\u540e\uff0c\u5f53\u4f60\u6309\u4e0b\u8ba1\u6570\u6309\u94ae\u65f6\uff0c\u4f60\u53ef\u4ee5\u786e\u8ba4\u6240\u6709\u7ec4\u4ef6\u90fd\u88ab\u91cd\u65b0\u6e32\u67d3\u4e86\uff0c\u6548\u679c\u5982\u4e0b\u3002<\/p>\n
            \"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
            \u4f7f\u7528React.memo\u6765\u5bf9\u7ec4\u4ef6\u8fdb\u884c\u8bb0\u5fc6\u5316<\/h2>\n
            React.memo\u662f\u7528\u6765\u8bb0\u5fc6\u7ec4\u4ef6\u7684\u3002\u5c06\u4e0a\u9762\u4ee3\u7801\u4e2d\u7684\u7ec4\u4ef6\u6539\u4e3a\u4f7f\u7528React.memo\u3002<\/p>\n
            const<\/span> Component<\/span> =<\/span> memo<\/span>(()<\/span> =><\/span>{});<\/span>\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> useState<\/span>,<\/span> memo<\/span>,<\/span> useCallback<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child1<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child1<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child4<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child4<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> App<\/span> =<\/span> memo<\/span>(()<\/span> =><\/span> {<\/span> \/\/ memo\u306b\u5909\u66f4\u3057\u305f<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>App \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  const<\/span> [<\/span>num<\/span>,<\/span> setNum<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  const<\/span> onClickButton<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setNum<\/span>(<\/span>num<\/span> +<\/span> 1<\/span>);<\/span>\r\n  };<\/span>\r\n\r\n  const<\/span> onClickReset<\/span> =<\/span> useCallback<\/span>(()<\/span> =><\/span> {<\/span>\r\n    setNum<\/span>(<\/span>0<\/span>);<\/span>\r\n  },<\/span> []);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onClickButton<\/span>}<\/span>><\/span>\u30dc\u30bf\u30f3<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>num<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>Child1<\/span> onClickReset<\/span>=<\/span>{<\/span>onClickReset<\/span>}<\/span> \/><\/span>\r\n      <<\/span>Child4<\/span> \/><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> memo<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child2<\/span> }<\/span> from<\/span> \"<\/span>.\/Child2<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child3<\/span> }<\/span> from<\/span> \"<\/span>.\/Child3<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#AAFFFF <\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child1<\/span> =<\/span> memo<\/span>((<\/span>props<\/span>)<\/span> =><\/span> {<\/span> \/\/ memo\u306b\u5909\u66f4\u3057\u305f<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child1 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  const<\/span> {<\/span> onClickReset<\/span> }<\/span> =<\/span> props<\/span>;<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child1<\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onClickReset<\/span>}<\/span>><\/span>\u30ea\u30bb\u30c3\u30c8<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>Child2<\/span> \/><\/span>\r\n      <<\/span>Child3<\/span> \/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> memo<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#FFCCFF<\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child2<\/span> =<\/span> memo<\/span>(()<\/span> =><\/span> {<\/span> \/\/ memo\u306b\u5909\u66f4\u3057\u305f<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child2 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child2<\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> memo<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#FFCCFF<\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child3<\/span> =<\/span> memo<\/span>(()<\/span> =><\/span> {<\/span> \/\/ memo\u306b\u5909\u66f4\u3057\u305f<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child3 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child3<\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> memo<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#66FF00<\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child4<\/span> =<\/span> memo<\/span>(()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child4 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child4<\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n<\/code><\/pre>\n
            \"FireShot<\/div>\n
            \u901a\u8fc7\u8bb0\u5fc6\u5316\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u8ba4\u53ea\u6709App\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u4e86\u3002<\/p>\n
            \"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
            \u5c1d\u8bd5\u901a\u8fc7\u51fd\u6570\u8fdb\u884c\u518d\u6e32\u67d3\u3002<\/h2>\n
            \u6211\u5199\u4e86\u4e00\u4e2a\u51fd\u6570\u6765\u91cd\u7f6e\u8ba1\u6570\u6309\u94ae\uff0c\u5e76\u521b\u5efa\u4e86\u5c06\u51fd\u6570\u4f20\u9012\u7ed9Child1\u7684\u4ee3\u7801\u3002\u5f53\u6267\u884c\u8ba1\u6570\u589e\u52a0\u65f6\uff0c\u4f1a\u5bfc\u81f4Child1\u91cd\u65b0\u6e32\u67d3\uff0c\u8fd9\u5c31\u662f\u4e4b\u524d\u8bb0\u5fc6\u5316\u7684\u95ee\u9898\u3002<\/p>\n
            \"FireShot<\/div>\n
            \"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
            import<\/span> {<\/span> useState<\/span>,<\/span> memo<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child1<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child1<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child4<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child4<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> App<\/span> =<\/span> memo<\/span>(()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>App \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  const<\/span> [<\/span>num<\/span>,<\/span> setNum<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  const<\/span> onClickButton<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setNum<\/span>(<\/span>num<\/span> +<\/span> 1<\/span>);<\/span>\r\n  };<\/span>\r\n\r\n\/\/ \u8ffd\u52a0\u3057\u307e\u3057\u305f<\/span>\r\n  const<\/span> onClickReset<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setNum<\/span>(<\/span>0<\/span>);<\/span>\r\n  };<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onClickButton<\/span>}<\/span>><\/span>\u30dc\u30bf\u30f3<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>num<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>Child1<\/span> onClickReset<\/span>=<\/span>{<\/span>onClickReset<\/span>}<\/span> \/><\/span>\u3000\/\/ \u95a2\u6570\u306e\u53d7\u3051\u6e21\u3057\u3092\u8ffd\u52a0\u3057\u307e\u3057\u305f\r\n      <<\/span>Child4<\/span> \/><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n\r\n<\/code><\/pre>\n
            import<\/span> {<\/span> memo<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child2<\/span> }<\/span> from<\/span> \"<\/span>.\/Child2<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child3<\/span> }<\/span> from<\/span> \"<\/span>.\/Child3<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> style<\/span> =<\/span> {<\/span>\r\n  backgroundColor<\/span>:<\/span> \"<\/span>#AAFFFF <\/span>\"<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> const<\/span> Child1<\/span> =<\/span> memo<\/span>((<\/span>props<\/span>)<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>Child1 \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  const<\/span> {<\/span> onClickReset<\/span> }<\/span> =<\/span> props<\/span>;<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Child1<\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onClickReset<\/span>}<\/span>><\/span>\u30ea\u30bb\u30c3\u30c8<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>Child2<\/span> \/><\/span>\r\n      <<\/span>Child3<\/span> \/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n\r\n<\/code><\/pre>\n
            \u5c1d\u8bd5\u4f7f\u7528useCallback\u8fdb\u884c\u51fd\u6570\u8bb0\u5fc6\u5316<\/h2>\n
            React\u4e2d\u7684memoization\u51fd\u6570\u4f7f\u7528useCallback\u3002\u5c06onClickReset\u51fd\u6570\u4f7f\u7528useCallback\u5982\u4e0b\u65b9\u5f0f\u7f16\u5199\u3002\u5c06\u51fd\u6570\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u5c06\u4f9d\u8d56\u6570\u7ec4\u7684\u5143\u7d20\u4f5c\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5199\u5165\u3002\u5f53\u4f9d\u8d56\u6570\u7ec4\u4e3a\u7a7a\u65f6\uff0c\u5b83\u53ea\u4f1a\u88ab\u52a0\u8f7d\u548c\u6e32\u67d3\u4e00\u6b21\u3002\u4ece\u7b2c\u4e8c\u6b21\u5f00\u59cb\uff0c\u5c06\u4f7f\u7528\u6700\u521d\u521b\u5efa\u7684\u5185\u5bb9\u3002<\/p>\n
            import<\/span> {<\/span> useState<\/span>,<\/span> memo<\/span>,<\/span> useCallback<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child1<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child1<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> Child4<\/span> }<\/span> from<\/span> \"<\/span>.\/components\/Child4<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> App<\/span> =<\/span> memo<\/span>(()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>App \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 <\/span>\"<\/span>);<\/span>\r\n\r\n  const<\/span> [<\/span>num<\/span>,<\/span> setNum<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  const<\/span> onClickButton<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setNum<\/span>(<\/span>num<\/span> +<\/span> 1<\/span>);<\/span>\r\n  };<\/span>\r\n\r\n  const<\/span> onClickReset<\/span> =<\/span> useCallback<\/span>(()<\/span> =><\/span> {<\/span> \/\/useCallback\u3092\u4f7f\u3046\u3088\u3046\u306b\u5909\u66f4\u3057\u305f<\/span>\r\n    setNum<\/span>(<\/span>0<\/span>);<\/span>\r\n  },<\/span> []);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onClickButton<\/span>}<\/span>><\/span>\u30dc\u30bf\u30f3<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>num<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>Child1<\/span> onClickReset<\/span>=<\/span>{<\/span>onClickReset<\/span>}<\/span> \/><\/span>\r\n      <<\/span>Child4<\/span> \/><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n\r\n<\/code><\/pre>\n
            Child1 \u4e0d\u518d\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
            \"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
            \u5728React\u4e2d\u53ef\u4ee5\u4f7f\u7528React.useMemo\u6765\u8fdb\u884c\u53d8\u91cf\u7684\u8bb0\u5fc6\u5316\u3002<\/h2>\n
            \u8981\u5b9e\u73b0\u53d8\u91cf\u548c\u503c\u7684\u8bb0\u5fc6\u5316\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528React\u7684useMemo\u51fd\u6570\u3002\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u5165\u8ba1\u7b97\u5f0f\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u5165\u4f9d\u8d56\u6570\u7ec4\u7684\u5143\u7d20\u3002\u53ea\u6709\u4f9d\u8d56\u6570\u7ec4\u7684\u5143\u7d20\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u624d\u4f1a\u91cd\u65b0\u8ba1\u7b97\u8bb0\u5fc6\u5316\u7684\u503c\u3002\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u5982\u679ca\u548cb\u7684\u503c\u4e0d\u53d8\uff0c\u90a3\u4e48\u5c06\u91cd\u590d\u4f7f\u7528\u9996\u6b21\u6e32\u67d3\u65f6\u7684\u503c\u3002<\/p>\n
            const<\/span> memoizedValue<\/span> =<\/span> useMemo<\/span>(()<\/span> =><\/span> {<\/span>\r\n    return<\/span> a<\/span> +<\/span> b<\/span>;<\/span>\r\n    },<\/span> [<\/span>a<\/span>,<\/span> b<\/span>]);<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
            \u5728\u6e32\u67d3\u4f18\u5316\u4e2d\u4f7f\u7528memo\u3001useCallback\u548cReact.useMemo\u8fdb\u884c\u4f18\u5316\u3002 \u5728React\u5f00\u53d1\u4e2d\uff0c\u53ef […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38213","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u4f7f\u7528React.memo\uff0cuseCallback\u548cReact.useMemo\u6765\u4f18\u5316\u6e32\u67d3 - 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\/\u4f7f\u7528react-memo\uff0cusecallback\u548creact-usememo\u6765\u4f18\u5316\u6e32\u67d3\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528React.memo\uff0cuseCallback\u548cReact.useMemo\u6765\u4f18\u5316\u6e32\u67d3\" \/>\n<meta property=\"og:description\" content=\"\u5728\u6e32\u67d3\u4f18\u5316\u4e2d\u4f7f\u7528memo\u3001useCallback\u548cReact.useMemo\u8fdb\u884c\u4f18\u5316\u3002 \u5728React\u5f00\u53d1\u4e2d\uff0c\u53ef […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528react-memo\uff0cusecallback\u548creact-usememo\u6765\u4f18\u5316\u6e32\u67d3\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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