{"id":38423,"date":"2023-12-31T02:46:48","date_gmt":"2023-05-05T03:44:31","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e9%80%9a%e8%bf%87%e4%bd%bf%e7%94%a8react-memo%e6%9d%a5%e6%94%b9%e5%96%84%e6%98%be%e7%a4%ba%e6%80%a7%e8%83%bd\/"},"modified":"2024-05-04T16:06:22","modified_gmt":"2024-05-04T08:06:22","slug":"%e3%80%90react%e3%80%91%e9%80%9a%e8%bf%87%e4%bd%bf%e7%94%a8react-memo%e6%9d%a5%e6%94%b9%e5%96%84%e6%98%be%e7%a4%ba%e6%80%a7%e8%83%bd","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e9%80%9a%e8%bf%87%e4%bd%bf%e7%94%a8react-memo%e6%9d%a5%e6%94%b9%e5%96%84%e6%98%be%e7%a4%ba%e6%80%a7%e8%83%bd\/","title":{"rendered":"\u3010React\u3011\u901a\u8fc7\u4f7f\u7528React.memo\u6765\u6539\u5584\u663e\u793a\u6027\u80fd"},"content":{"rendered":"

\u4ee5\u524d\u6211\u603b\u7ed3\u4e86\u4f7f\u7528\u4ee3\u7801\u5206\u5272\u6765\u6539\u5584React\u7684\u663e\u793a\u6027\u80fd\u3002\u73b0\u5728\uff0c\u6211\u5bf9React.memo\u5bf9\u663e\u793a\u7684\u5f71\u54cd\u8fdb\u884c\u4e86\u9a8c\u8bc1\uff0c\u5e76\u6574\u7406\u4e86\u76f8\u5173\u5185\u5bb9\u3002<\/p>\n

React.memo\u662f\u4ec0\u4e48<\/h1>\n

React.memo\u662f\u4e00\u4e2a\u9ad8\u9636\u7ec4\u4ef6\uff08\u63a5\u53d7\u4e00\u4e2a\u7ec4\u4ef6\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7ec4\u4ef6\u7684\u51fd\u6570\uff09\u3002<\/p>\n

\u5f53\u7ed9\u4e88\u67d0\u4e2a\u7ec4\u4ef6\u76f8\u540c\u7684props\u5e76\u6e32\u67d3\u76f8\u540c\u7684\u7ed3\u679c\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u5c06\u8be5\u7ec4\u4ef6\u5305\u88c5\u5728React.memo\u4e2d\u6765\u8bb0\u5fc6\u7ed3\u679c\u3002\u901a\u8fc7\u91cd\u7528React\u6240\u5b58\u50a8\u7684\u6e32\u67d3\u7ed3\u679c\uff0c\u53ef\u4ee5\u63d0\u9ad8\u663e\u793a\u6027\u80fd\u3002<\/p>\n

\u7136\u800c\uff0cReact.memo\u53ea\u662f\u7528\u4e8e\u6027\u80fd\u4f18\u5316\u7684\u65b9\u6cd5\uff0c\u4e0d\u63a8\u8350\u5c06\u5176\u7528\u4e8e\u201c\u963b\u6b62\u6e32\u67d3\u201d\u3002
\n\u7531\u4e8e\u53ef\u80fd\u5f15\u53d1\u9519\u8bef\uff0c\u6700\u597d\u4e0d\u8981\u6ee5\u7528\u5b83\u3002<\/p>\n

\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u5728Class\u7ec4\u4ef6\u4e2d\u5b9e\u73b0\u7c7b\u4f3c\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u4f7f\u7528React.PureComponent\u6216shouldComponentUpdate()\u8fd9\u4e24\u4e2a\u751f\u547d\u5468\u671f\u65b9\u6cd5\u3002<\/p>\n

\u9a8c\u8bc1<\/h1>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n

\u521b\u5efa\u5e94\u7528\u7a0b\u5e8f\u3002<\/h2>\n

\u6211\u8981\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aApp\u7684\u7ec4\u4ef6\uff0c\u5b83\u662fPerson\u7ec4\u4ef6\u7684\u7236\u7ec4\u4ef6\u3002
\n\u6839\u636eshowPerson\u7684\u72b6\u6001\uff08true\/false\uff09\uff0c\u5207\u6362Person\u7684\u663e\u793a\u3002<\/p>\n

import<\/span> React<\/span>,<\/span> useState<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> logo<\/span> from<\/span> '<\/span>.\/logo.svg<\/span>'<\/span>;<\/span>\r\nimport<\/span> '<\/span>.\/App.css<\/span>'<\/span>;<\/span>\r\n\r\nimport<\/span> Person<\/span> from<\/span> '<\/span>.\/person.component<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n\r\n  const<\/span> initialState<\/span> =<\/span> {<\/span>\r\n    count<\/span>:<\/span> 0<\/span>,<\/span>\r\n    person<\/span>:<\/span> {<\/span> name<\/span>:<\/span> '<\/span>Jack<\/span>'<\/span>,<\/span> age<\/span>:<\/span> 22<\/span> },<\/span>\r\n    showPerson<\/span>:<\/span> false<\/span>,<\/span>\r\n  }<\/span>\r\n\r\n  const<\/span> [<\/span>state<\/span>,<\/span> setState<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>initialState<\/span>)<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>\"App\"<\/span>><\/span>\r\n      <<\/span>header<\/span> className<\/span>=<\/span>\"App-header\"<\/span>><\/span>\r\n        <<\/span>img<\/span> src<\/span>=<\/span>{<\/span>logo<\/span>}<\/span> className<\/span>=<\/span>\"App-logo\"<\/span> alt<\/span>=<\/span>\"logo\"<\/span> \/><\/span>\r\n        {<\/span>state<\/span>.<\/span>showPerson<\/span> ?<\/span> <<\/span>Person<\/span> person<\/span>=<\/span>{<\/span>state<\/span>.<\/span>person<\/span>}<\/span> \/><\/span> :<\/span> null<\/span>}<\/span>\r\n        Button Count: {<\/span>state<\/span>.<\/span>count<\/span>}<\/span>\r\n        <<\/span>button<\/span>\r\n          onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span>\r\n            setState<\/span>((<\/span>prevState<\/span>)<\/span> =><\/span> ({<\/span>\r\n              ...<\/span>prevState<\/span>,<\/span>\r\n              count<\/span>:<\/span> prevState<\/span>.<\/span>count<\/span> +<\/span> 1<\/span>,<\/span>\r\n            }))<\/span>\r\n          }<\/span>\r\n        ><\/span>\r\n          Increase Count\r\n        <\/<\/span>button<\/span>><\/span>\r\n        <<\/span>button<\/span>\r\n          onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span>\r\n            setState<\/span>((<\/span>prevState<\/span>)<\/span> =><\/span> ({<\/span>\r\n              ...<\/span>prevState<\/span>,<\/span>\r\n              showPerson<\/span>:<\/span> !<\/span>prevState<\/span>.<\/span>showPerson<\/span>,<\/span>\r\n            }))<\/span>\r\n          }<\/span>\r\n        ><\/span>\r\n          Toggle Person\r\n        <\/<\/span>button<\/span>><\/span>\r\n      <\/<\/span>header<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> App<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u751f\u6210Person<\/h2>\n
\u6211\u8981\u521b\u5efa\u4e00\u4e2a\u4eba\u7ec4\u4ef6\u3002<\/p>\n
\u672a\u4f7f\u7528React.memo\u3002<\/h3>\n
\u6267\u884c\u5e38\u89c4\u9ed8\u8ba4\u5bfc\u51fa\u3002<\/p>\n
import<\/span> React<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> Person<\/span> =<\/span> ({<\/span> person<\/span> })<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>rendering<\/span>'<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>person<\/span>.<\/span>name<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>person<\/span>.<\/span>age<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> Person<\/span>;<\/span>\r\n<\/code><\/pre>\n
React.memo\u7684\u4f7f\u7528<\/h3>\n
\u5728\u5bfc\u51faPerson\u65f6\uff0c\u4f7f\u7528React.memo\u8fdb\u884c\u5305\u88c5\u3002<\/p>\n
import<\/span> React<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> Person<\/span> =<\/span> ({<\/span> person<\/span> })<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>rendering<\/span>'<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>person<\/span>.<\/span>name<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>{<\/span>person<\/span>.<\/span>age<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> React<\/span>.<\/span>memo<\/span>(<\/span>Person<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6bd4\u8f83\u7ed3\u679c<\/h2>\n
\u6211\u6bd4\u8f83\u4e86\u5728\u6309\u4e0b\u4e00\u6b21\u201cToggle Person\u201d\u6309\u94ae\u540e\uff0c\u8fde\u7eed\u6309\u4e0b\u201cIncrease Count\u201d\u6309\u94ae\u591a\u6b21\u7684\u7ed3\u679c\u3002<\/p>\n
\u8be5\u4eba\u7684\u6e32\u67d3\u6b21\u6570<\/h2>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u4e2a\u4f53\u7684\u6e32\u67d3\u65f6\u95f4<\/h2>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u968f\u7740\u8bb0\u5fc6\u529f\u80fd\u7684\u4f7f\u7528\uff0c\u4f7f\u7528React.memo\u8fdb\u884c\u521d\u59cb\u6e32\u67d3\u4f1a\u82b1\u8d39\u66f4\u591a\u65f6\u95f4\u3002<\/p>\n
\u6839\u636edev-tool\u6d4b\u901f\uff0c\u8003\u8651\u4ec5\u5728\u5fc5\u8981\u65f6\u4f7f\u7528React.memo\uff0c\u56e0\u4e3a\u5b83\u4e5f\u6709\u4e00\u4e9b\u7f3a\u70b9\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53c2\u8003\u8d44\u6599<\/h1>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5efa\u8bae\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u4f9b\u53c2\u8003\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u53ef\u4f9b\u53c2\u8003\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53ef\u4ee5\u53c2\u8003\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u63a8\u8350\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53ef\u4ee5\u501f\u9274\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53ef\u4f9b\u53c2\u8003\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53ef\u4f9b\u67e5\u8be2\u7684\u8d44\u6599<\/p>\n
\u4ee5\u4e0b\u662f\u53ef\u4f9b\u53c2\u8003\u7684\u4e00\u4e9b\u8d44\u6599<\/p>\n","protected":false},"excerpt":{"rendered":"
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