{"id":37991,"date":"2023-04-28T21:15:37","date_gmt":"2024-01-19T22:58:07","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%8f%8d%e5%ba%94%e7%9a%84%e8%ae%b0%e5%bf%86%e5%8c%96%e5%ba%94%e8%af%a5%e6%98%af%e6%9c%80%e5%90%8e%e7%9a%84%e6%89%8b%e6%ae%b5%e6%89%8d%e6%98%af%e6%9c%80%e5%a5%bd%e7%9a%84%e8%a7%a3%e5%86%b3%e6%96%b9\/"},"modified":"2024-04-30T01:45:53","modified_gmt":"2024-04-29T17:45:53","slug":"%e5%8f%8d%e5%ba%94%e7%9a%84%e8%ae%b0%e5%bf%86%e5%8c%96%e5%ba%94%e8%af%a5%e6%98%af%e6%9c%80%e5%90%8e%e7%9a%84%e6%89%8b%e6%ae%b5%e6%89%8d%e6%98%af%e6%9c%80%e5%a5%bd%e7%9a%84%e8%a7%a3%e5%86%b3%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%8f%8d%e5%ba%94%e7%9a%84%e8%ae%b0%e5%bf%86%e5%8c%96%e5%ba%94%e8%af%a5%e6%98%af%e6%9c%80%e5%90%8e%e7%9a%84%e6%89%8b%e6%ae%b5%e6%89%8d%e6%98%af%e6%9c%80%e5%a5%bd%e7%9a%84%e8%a7%a3%e5%86%b3%e6%96%b9\/","title":{"rendered":"\u53cd\u5e94\u7684\u8bb0\u5fc6\u5316\u5e94\u8be5\u662f\u6700\u540e\u7684\u624b\u6bb5\u624d\u662f\u6700\u597d\u7684\u89e3\u51b3\u65b9\u6848"},"content":{"rendered":"

\u5173\u4e8ememoization\u7684\u95ee\u9898<\/h1>\n

\u5f53React\u4e2d\u7684\u7236\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u5b50\u7ec4\u4ef6\u4e5f\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n

\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u5728\u7236\u7ec4\u4ef6\u4e2d\u6bcf\u6b21\u70b9\u51fb\u201ccount up\u201d\u6309\u94ae\u65f6\uff0c\u5b50\u7ec4\u4ef6ExpensiveComponent\u4e5f\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n

\u5f53ExpensiveComponent\u5305\u542b\u4e86\u975e\u5e38\u8017\u65f6\u7684\u5904\u7406\u65f6\uff0c\u5728\u6bcf\u6b21\u6309\u4e0b\u8ba1\u6570\u6309\u94ae\u65f6\u90fd\u4f1a\u89e6\u53d1\u8be5\u8017\u65f6\u7684\u5904\u7406\uff0c\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/p>\n

import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n\r\n      <<\/span>ExpensiveComponent<\/span>\/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>()<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 100000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return<\/span> <<\/span>p<\/span>><\/span>expensive<\/<\/span>p<\/span>><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"not_memo_rendering.gif\"<\/div>\n
\u4e3a\u4e86\u9632\u6b62\u8fd9\u79cd\u884c\u4e3a\uff0c\u5728\u6b64\u8fdb\u884c\u5907\u5fd8\u5f55\u7f13\u5b58\u3002<\/p>\n
\u901a\u8fc7\u5bf9\u5b50\u7ec4\u4ef6\u8fdb\u884c\u8bb0\u5fc6\u5316\u7684\u65b9\u5f0f\uff0c\u5373\u4f7f\u7236\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\uff0c\u5b50\u7ec4\u4ef6\u4e5f\u4e0d\u4f1a\u518d\u6b21\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n\r\n      <<\/span>ExpensiveComponentMemo<\/span>\/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\nconst<\/span> ExpensiveComponentMemo<\/span> =<\/span> React<\/span>.<\/span>memo<\/span>(<\/span>ExpensiveComponent<\/span>);<\/span>\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>()<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 100000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return<\/span> <<\/span>p<\/span>><\/span>expensive<\/<\/span>p<\/span>><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"momo_render.gif\"<\/div>\n
\u8bb0\u5fc6\u5316\u7684\u95ee\u9898<\/h1>\n
\u5728\u5c06\u6765\u7684\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u4f7f\u7528memo\u5316\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u5b9e\u73b0\u4e0a\u7684\u5c0f\u53d8\u5316\u800c\u5bfc\u81f4\u65e0\u6cd5\u6309\u9884\u671f\u8fd0\u884c\u7684\u62c5\u5fe7\u3002<\/p>\n
\u4f20\u9012\u9053\u5177\u7684\u6a21\u5f0f<\/h2>\n
\u5982\u679c\u6211\u4eec\u628astyle\u901a\u8fc7props\u4f20\u9012\u7ed9ExpensiveComponent \uff0c\u4f1a\u600e\u4e48\u6837\u5462\uff1f<\/p>\n
\u7531\u65bc\u5728\u50b3\u905e\u7d66ExpensiveComponent\u6642\uff0c\u4e00\u76f4\u662f\u540c\u4e00\u500b\u7269\u4ef6\uff0c\u6240\u4ee5\u770b\u8d77\u4f86\u7b26\u5408\u9810\u671f\u7684\u904b\u4f5c\u65b9\u5f0f\uff0c\u4f46\u662f\u7531\u65bc\u7236\u7d44\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\uff0c\u5b50\u7d44\u4ef6\u4e5f\u6703\u88ab\u91cd\u65b0\u6e32\u67d3\uff0c\u5c0e\u81f4\u7121\u6cd5\u5be6\u73fememo\u5316\u7684\u6548\u679c\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n\r\n      <<\/span>ExpensiveComponentMemo<\/span> style<\/span>=<\/span>{<\/span>{<\/span>\"<\/span>color<\/span>\"<\/span>:<\/span>\"<\/span>red<\/span>\"<\/span>}<\/span>}<\/span>\/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\nconst<\/span> ExpensiveComponentMemo<\/span> =<\/span> React<\/span>.<\/span>memo<\/span>(<\/span>ExpensiveComponent<\/span>);<\/span>\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>({<\/span>style<\/span>})<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 100000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return<\/span> <<\/span>p<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>expensive<\/<\/span>p<\/span>><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"props_rendering.gif\"<\/div>\n
\u8fd9\u662f\u56e0\u4e3aReact\u7684Props\u5dee\u5f02\u662f\u901a\u8fc7Object.is\u8fdb\u884c\u6bd4\u8f83\u7684\uff0c\u5982\u679c\u662f\u76f8\u540c\u7684\u5219\u4e0d\u4f1a\u8fdb\u884c\u91cd\u65b0\u6e32\u67d3\uff0c\u5982\u679c\u4e0d\u76f8\u540c\u5219\u4f1a\u88ab\u5224\u65ad\u4e3a\u6709\u5dee\u5f02\u5e76\u8fdb\u884c\u91cd\u65b0\u6e32\u67d3\u3002(https:\/\/zh-hans.react.dev\/reference\/react\/memo#minimizing-props-changes)<\/p>\n
\u53ea\u6709\u5728\u4e24\u4e2a\u503c\u5f15\u7528\u5185\u5b58\u4e2d\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0cObject.is\u624d\u4f1a\u8fd4\u56detrue\uff0c\u56e0\u6b64\u5728\u4e0b\u9762\u7684\u60c5\u51b5\u4e0b\u4f1a\u8fd4\u56defalse\u3002<\/p>\n
\/\/ false\u306b\u306a\u3063\u3066\u3057\u307e\u3046\uff01\uff01<\/span>\r\nObject<\/span>.<\/span>is<\/span>({<\/span>\"<\/span>color<\/span>\"<\/span>:<\/span>\"<\/span>red<\/span>\"<\/span>},{<\/span>\"<\/span>color<\/span>\"<\/span>:<\/span>\"<\/span>red<\/span>\"<\/span>})<\/span>\r\n<\/code><\/pre>\n
\u5c3d\u7ba1\u5bf9\u8c61\u7684\u5185\u5bb9\u5b9e\u9645\u4e0a\u5e76\u6ca1\u6709\u6539\u53d8\uff0c\u4f46\u5728React\u5185\u90e8\u88ab\u5224\u65ad\u4e3a\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u5e76\u89e6\u53d1\u4e86\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528useMemo\u3002
\n\u8fd9\u6837\u4e00\u6765\uff0cmemoStyle\u5c06\u4f1a\u88ab\u89c6\u4e3a\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5373\u4f7f\u4f7f\u7528Object.is\u8fdb\u884c\u6bd4\u8f83\uff0c
\n\u5b50\u7ec4\u4ef6\u4e5f\u4e0d\u4f1a\u518d\u6b21\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  const<\/span> memoStyle<\/span> =<\/span> React<\/span>.<\/span>useMemo<\/span>(()<\/span>=><\/span>({<\/span>\"<\/span>color<\/span>\"<\/span>:<\/span>\"<\/span>red<\/span>\"<\/span>}),[])<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n\r\n      <<\/span>ExpensiveComponentMemo<\/span> style<\/span>=<\/span>{<\/span>memoStyle<\/span>}<\/span>\/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\nconst<\/span> ExpensiveComponentMemo<\/span> =<\/span> React<\/span>.<\/span>memo<\/span>(<\/span>ExpensiveComponent<\/span>);<\/span>\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>({<\/span>style<\/span>})<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 100000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return<\/span> <<\/span>p<\/span> style<\/span>=<\/span>{<\/span>style<\/span>}<\/span>><\/span>expensive<\/<\/span>p<\/span>><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"rendering_props_memo.gif\"<\/div>\n
\u7136\u800c\uff0c\u5f53\u4f20\u9012\u7684props\u589e\u52a0\u65f6\uff0c\u65e0\u6cd5\u4fdd\u8bc1\u6240\u6709\u5f00\u53d1\u4eba\u5458\u90fd\u80fd\u9884\u6599\u5230\u8fd9\u79cd\u884c\u4e3a\uff0c\u5e76\u6b63\u786e\u5730\u4f7f\u7528useMemo\u3002\u6709\u65f6\u5019\u53ea\u6709\u5728\u68c0\u6d4b\u5230\u6027\u80fd\u4e0b\u964d\u65f6\u624d\u4f1a\u610f\u8bc6\u5230\u5b9e\u73b0\u9519\u8bef\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u9677\u5165\u56f0\u5883\u3002
\n\u4e0d\u6ce8\u610f\u8fd9\u79cd\u9677\u9631\u53ef\u80fd\u4f1a\u5bfc\u81f4\u907f\u514dmemo\u5316\u7684\u4e00\u4e2a\u539f\u56e0\u3002<\/p>\n
\u7ed9\u4e88\u5b69\u5b50\u4eec\u7684\u573a\u666f\u3002<\/h2>\n
\u6211\u4eec\u4e5f\u8003\u8651\u5c06\u5b69\u5b50\u4ea4\u7ed9\u4ed6\u4eba\u7684\u60c5\u51b5\u3002<\/p>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u867d\u7136\u4e00\u5f00\u59cb\u770b\u8d77\u6765ExpensiveComponent\u7684\u5b50\u5143\u7d20\u662f\u76f8\u540c\u7684\uff0c\u4f3c\u4e4e\u4f1a\u6309\u7167\u9884\u671f\u7684\u65b9\u5f0f\u5de5\u4f5c\uff0c\u4f46\u662f\u7531\u4e8e\u4e0e\u7236\u7ec4\u4ef6\u7684\u6e32\u67d3\u540c\u6b65\uff0c\u5b50\u7ec4\u4ef6\u4e5f\u4f1a\u88ab\u6e32\u67d3\uff0c\u5bfc\u81f4\u4ee3\u7801\u65e0\u6cd5\u8fdb\u884cmemo\u5316\u7684\u529f\u80fd\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n\r\n      <<\/span>ExpensiveComponentMemo<\/span>><\/span>\r\n        <<\/span>p<\/span>><\/span>children<\/<\/span>p<\/span>><\/span>\r\n      <\/<\/span>ExpensiveComponentMemo<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\nconst<\/span> ExpensiveComponentMemo<\/span> =<\/span> React<\/span>.<\/span>memo<\/span>(<\/span>ExpensiveComponent<\/span>);<\/span>\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>({<\/span>children<\/span>})<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 1000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return<\/span> <<\/span>div<\/span>><\/span>expensive{<\/span>children<\/span>}<\/span><\/<\/span>div<\/span>><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"render_children.gif\"<\/div>\n
\u5728React\u4e2d\uff0cJSX\u8bed\u6cd5\u662fReact.createElement\u7684\u8bed\u6cd5\u7cd6\uff0c\u5b9e\u9645\u4e0a\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u56e0\u6b64\u4f1a\u53d1\u751f\u4e0e\u4e4b\u524d\u76f8\u540c\u7684\u60c5\u51b5\u3002<\/p>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528useMemo\u6765\u9632\u6b62\u91cd\u65b0\u6e32\u67d3\uff0c\u4f46\u8003\u8651\u5230\u53ef\u8bfb\u6027\u548c\u7075\u6d3b\u6027\u95ee\u9898\uff0c\u8fd9\u6837\u7684\u4ee3\u7801\u5bb9\u6613\u4ea7\u751f\u9519\u8bef\u3002<\/p>\n
\u66ff\u4ee3memo\u7684\u9009\u9879<\/h1>\n
\u5728\u6211\u4e4b\u524d\u7684\u63cf\u8ff0\u4e2d\uff0c\u6211\u63d0\u5230\u4e86\u8bb0\u5fc6\u5316\u53ef\u80fd\u5b58\u5728\u610f\u60f3\u4e0d\u5230\u7684\u9677\u9631\uff0c\u7279\u522b\u662f\u5728\u591a\u4eba\u5408\u4f5c\u5f00\u53d1\u548c\u7ee7\u627f\u7684\u9879\u76ee\u4e2d\uff0c\u5f88\u53ef\u80fd\u4f1a\u4e0d\u77e5\u4e0d\u89c9\u5730\u5f15\u5165\u9519\u8bef\u5e76\u5bfc\u81f4\u6545\u969c\u7684\u53ef\u80fd\u6027\u5f88\u5927\uff0c\u56e0\u6b64\u5efa\u8bae\u5c3d\u91cf\u5c11\u4f7f\u7528\u3002
\n\u4f46\u662f\uff0c\u4e3a\u4e86\u89e3\u51b3\u6027\u80fd\u4e0a\u7684\u987e\u8651\uff0c\u6211\u5c06\u4ecb\u7ecd\u4e00\u79cd\u907f\u514d\u91cd\u65b0\u6e32\u67d3\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n
\u4f7f\u7528state\u5206\u79bb\u7ec4\u4ef6<\/h2>\n
\u7531\u4e8e\u53ea\u6709\u4e00\u90e8\u5206\u4f7f\u7528\u4e86count\u7684state\uff0c\u6240\u4ee5\u6709\u4e00\u79cd\u65b9\u6cd5\u662f\u5c06\u8fd9\u90e8\u5206\u62c6\u5206\u5230\u53e6\u4e00\u4e2a\u7ec4\u4ef6\u4e2d\u3002<\/p>\n
\u901a\u8fc7\u8fd9\u4e2a\uff0c\u53d7\u5230 count \u6539\u53d8\u5f71\u54cd\u7684\u7ec4\u4ef6\u4f1a\u88ab\u9650\u5236\u5728 CountComponent \u4e0a\uff0c\u6240\u4ee5 ExpensiveComponent \u53ef\u4ee5\u901a\u8fc7 count \u7684\u53d8\u5316\u6765\u907f\u514d\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>CountComponent<\/span>\/><\/span>\r\n      \r\n\r\n      <<\/span>ExpensiveComponent<\/span>\/><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> CountComponent<\/span>(){<\/span>\r\n [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n return<\/span> <<\/span>p<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n}<\/span>\r\n\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>(<\/span>props<\/span>)<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 100000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return <\/span>(<\/span>\r\n  <><\/span>\r\n  <<\/span>p<\/span>><\/span>expensive<\/<\/span>p<\/span>><\/span>\r\n  <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n  <\/><\/span>\r\n  )<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528children\u5c06\u7ec4\u4ef6\u5206\u79bb<\/h2>\n
\u5982\u679c\u4f60\u60f3\u8981\u4fdd\u6301\u8fd9\u6837\u7684DOM\u7ed3\u6784\uff0c\u4f3c\u4e4e\u5f88\u96be\u5c06\u4f7f\u7528\u7b80\u5355\u7684state\u7684\u7ec4\u4ef6\u5206\u79bb\u5f00\u6765\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>div<\/span> className<\/span>=<\/span>'count'<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>div<\/span>><\/span>\r\n      <<\/span>div<\/span>><\/span>\r\n          <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n          <<\/span>ExpensiveComponent<\/span>\/><\/span>\r\n      <\/<\/span>div<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>()<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 100000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return<\/span> <<\/span>p<\/span>><\/span>expensive<\/<\/span>p<\/span>><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5373\u4f7f\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u901a\u8fc7\u5c06\u4f5c\u4e3achildren\u7684\u91cd\u578b\u5904\u7406\u5b50\u7ec4\u4ef6\u4f20\u9012\u7ed9CountComponent\u5e76\u663e\u793a\u5b83\uff0c\u53ef\u4ee5\u907f\u514d\u7531\u4e8ecount\u7684\u53d8\u5316\u800c\u5bfc\u81f4ExpensiveComponent\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span>useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello React.<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>CountComponent<\/span>><\/span>\r\n          <<\/span>ExpensiveComponent<\/span>\/><\/span>\r\n      <\/<\/span>CountComponent<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\ndunction<\/span> CountComponent<\/span>({<\/span>children<\/span>}){<\/span>\r\n    [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span>=<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n    return <\/span>(<\/span>\r\n       <><\/span>\r\n          <<\/span>div<\/span> className<\/span>=<\/span>'count'<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>div<\/span>><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n              <<\/span>button<\/span> type<\/span>=<\/span>\"button\"<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>setCount<\/span>((<\/span>count<\/span>)<\/span>=><\/span>count<\/span>+<\/span>1<\/span>)<\/span>}<\/span>><\/span>count Up!!!<\/<\/span>button<\/span>><\/span>\r\n              {<\/span>children<\/span>}<\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n        <\/><\/span>\r\n      );<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> ExpensiveComponent<\/span>()<\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>rendering<\/span>\"<\/span>);<\/span>\r\n  \/\/\u306a\u3093\u3089\u304b\u306e\u91cd\u3044\u51e6\u7406<\/span>\r\n  for <\/span>(<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <=<\/span> 100000<\/span>;<\/span>i<\/span>++<\/span>){<\/span>\r\n    i<\/span>=<\/span> i<\/span>+<\/span>1<\/span>;<\/span>\r\n  }<\/span>\r\n  return<\/span> <<\/span>p<\/span>><\/span>expensive<\/<\/span>p<\/span>><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u603b\u7ed3<\/h1>\n
\u5728\u5b9e\u65bd\u7ec4\u4ef6\u7684\u8bb0\u5fc6\u5316\u65f6\uff0c\u867d\u7136\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u4f46\u5728\u540e\u7eed\u7684\u7ef4\u62a4\u548c\u8fd0\u8425\u9636\u6bb5\u4e2d\u5f88\u53ef\u80fd\u4f1a\u65e0\u610f\u4e2d\u5f15\u5165\u9519\u8bef\u3002
\n\u6211\u8ba4\u4e3a\u9996\u5148\u8981\u8003\u8651\u662f\u5426\u53ef\u4ee5\u5728\u672c\u6b21\u66ff\u4ee3\u65b9\u6848\u4e2d\u5b9e\u73b0\u800c\u4e0d\u8fdb\u884c\u8bb0\u5fc6\u5316\u7684\u5b9e\u73b0\uff0c\u8fd9\u4e00\u70b9\u975e\u5e38\u91cd\u8981\u3002<\/p>\n
\u6587\u732e\u6765\u6e90<\/h1>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
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