{"id":38440,"date":"2023-12-07T23:09:02","date_gmt":"2023-01-12T19:50:35","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8react%e5%87%bd%e6%95%b0%e7%bb%84%e4%bb%b6%e4%b8%ad%ef%bc%8c%e5%8f%96%e4%bb%a3%e6%9e%84%e9%80%a0%e5%87%bd%e6%95%b0%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%e6%98%af%e4%bb%80%e4%b9%88\/"},"modified":"2024-05-04T12:35:27","modified_gmt":"2024-05-04T04:35:27","slug":"%e5%9c%a8react%e5%87%bd%e6%95%b0%e7%bb%84%e4%bb%b6%e4%b8%ad%ef%bc%8c%e5%8f%96%e4%bb%a3%e6%9e%84%e9%80%a0%e5%87%bd%e6%95%b0%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8react%e5%87%bd%e6%95%b0%e7%bb%84%e4%bb%b6%e4%b8%ad%ef%bc%8c%e5%8f%96%e4%bb%a3%e6%9e%84%e9%80%a0%e5%87%bd%e6%95%b0%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%e6%98%af%e4%bb%80%e4%b9%88\/","title":{"rendered":"\u5728React\u51fd\u6570\u7ec4\u4ef6\u4e2d\uff0c\u53d6\u4ee3\u6784\u9020\u51fd\u6570\u7684\u6700\u4f73\u5b9e\u8df5\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"

\u5728React\u7684JSX\u751f\u6210\u4e2d\uff0c\u5b58\u5728\u4e00\u4e2a\u56f0\u6270\u7684\u95ee\u9898\u3002<\/p>\n

\u8fd9\u662f\u5728SPA\u7b49\u573a\u666f\u4e0b\uff0c\u5e0c\u671b\u5728\u9875\u9762\u5207\u6362\u540e\u7acb\u5373\u8bfb\u53d6\u53d8\u91cf\u7684\u60c5\u51b5\u3002\u5177\u4f53\u800c\u8a00\uff0c\u5047\u8bbe\u6211\u4eec\u8981\u521b\u5efa\u4e00\u4e2aTodo\u529f\u80fd\u7684\u8be6\u7ec6\u9875\u9762\u3002\u6211\u4eec\u4ece\u53c2\u6570\u4e2d\u83b7\u53d6id\uff0c\u7136\u540e\u83b7\u53d6\u4e0e\u4e4b\u76f8\u5173\u8054\u7684Todo\u6570\u636e\u5e76\u663e\u793a\u8be6\u7ec6\u9875\u9762\u3002<\/p>\n

\u4f7f\u7528react-router-dom6<\/p>\n

import<\/span> React<\/span>,{<\/span> useState<\/span>,<\/span>useContext<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span>TodoContext<\/span>}<\/span> from<\/span> '<\/span>..\/App<\/span>'<\/span>\r\nimport<\/span> {<\/span>useParams<\/span>,<\/span>useNavigate<\/span> }<\/span> from<\/span> '<\/span>react-router-dom<\/span>'<\/span>\r\n\r\nconst<\/span> EditTodo<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>d_item<\/span>,<\/span>setItem<\/span>]<\/span> =<\/span> useState<\/span>([])<\/span>\r\n  const<\/span> context<\/span> =<\/span> useContext<\/span>(<\/span>TodoContext<\/span>)<\/span>\r\n  const<\/span> navigate<\/span> =<\/span> useNavigate<\/span>()<\/span>\r\n  const<\/span> params<\/span> =<\/span> useParams<\/span>()<\/span> \/\/\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089id\u53d6\u5f97<\/span>\r\n  \/*\u4e2d\u7565*\/<\/span>\r\n\treturn <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h2<\/span>><\/span>TODO\u3092\u7de8\u96c6\u3059\u308b<\/<\/span>h2<\/span>><\/span>\r\n      {<\/span>\r\n        (<\/span>params<\/span>.<\/span>id<\/span> !=<\/span> d_item<\/span>.<\/span>id<\/span>)?<\/span>\r\n          <<\/span>div<\/span>><\/span>ID:{<\/span>params<\/span>.<\/span>id<\/span>}<\/span>\u306eTODO\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/<\/span>div<\/span>><\/span>\r\n        :<\/span>\r\n        <<\/span>table<\/span>><\/span>\r\n          <<\/span>thead<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30bf\u30a4\u30c8\u30eb<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u8aac\u660e<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30b9\u30c6\u30fc\u30bf\u30b9<\/<\/span>th<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>thead<\/span>><\/span>\r\n          <<\/span>tbody<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>title<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>description<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>status<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>tbody<\/span>><\/span>\r\n        <\/<\/span>table<\/span>><\/span>\r\n      }<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>navigate<\/span>(<\/span>\"<\/span>\/<\/span>\"<\/span>)<\/span>}<\/span> ><\/span>\u623b\u308b<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n\t)<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> EditTodo<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5728React 16.7\u4ee5\u524d\uff0c\u4f7f\u7528\u7c7b\u7ec4\u4ef6\u65f6\uff0c\u5728\u6784\u9020\u51fd\u6570\u4e2d\u4f7f\u7528`constrcuter`\u6765\u63a7\u5236\u52a0\u8f7d\u65f6\u7684\u5904\u7406\uff0c\u6240\u4ee5\u5e76\u6ca1\u6709\u592a\u5927\u95ee\u9898\u3002\u4f46\u662f\uff0c\u5982\u679c\u4f7f\u7528\u51fd\u6570\u7ec4\u4ef6\uff0c\u5219\u9700\u8981\u627e\u5230\u66ff\u4ee3\u6784\u9020\u51fd\u6570\u7684\u65b9\u6cd5\u3002<\/p>\n
\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u8fd9\u662f\u5bf9\u4e4b\u524d\u53d1\u5e03\u7684\u4e00\u7bc7\u6587\u7ae0\u6536\u5230\u8bfb\u8005\uff08honey32\u5148\u751f\uff09\u6307\u51fa\u9519\u8bef\u540e\u7684\u56de\u5e94\uff0c\u6240\u4ee5\u6682\u65f6\u5220\u9664\u4e86\uff08\u56e0\u4e3aQiita\u65e0\u6cd5\u64a4\u4e0b\u6587\u7ae0\uff09\u5e76\u63d0\u53d6\u4e86\u60f3\u8981\u9009\u53d6\u7684\u90e8\u5206\u3002<\/p>\n
\u9009\u98791\uff1a\u4f7f\u7528useEffect\u94a9\u5b50\uff08\u672c\u6848\u4f8b\u4e0d\u9002\u5408\uff09<\/h1>\n
\u5f53\u5728Stack Overflow\u6216Github\u7684\u95ee\u9898\u4e2d\u641c\u7d22\u89e3\u51b3\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u4f1a\u5f97\u51fa\u4f7f\u7528useEffect\u94a9\u5b50\u7684\u7b54\u6848\u3002<\/p>\n
\u5982\u4f55\u4f7f\u7528\u51fd\u6570\u7ec4\u4ef6\uff08\u7bad\u5934\u51fd\u6570\u8bed\u6cd5\uff09\u6307\u5b9a\u6784\u9020\u51fd\u6570\uff1f<\/p>\n
\u7136\u800c\u2026\u2026<\/p>\n
import<\/span> React<\/span>,{<\/span> useState<\/span>,<\/span>useContext<\/span>,<\/span>useEffect<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span>TodoContext<\/span>}<\/span> from<\/span> '<\/span>..\/App<\/span>'<\/span>\r\nimport<\/span> {<\/span>useParams<\/span>,<\/span>useNavigate<\/span> }<\/span> from<\/span> '<\/span>react-router-dom<\/span>'<\/span>\r\n\r\nconst<\/span> EditTodo<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>d_item<\/span>,<\/span>setItem<\/span>]<\/span> =<\/span> useState<\/span>([])<\/span>\r\n  const<\/span> context<\/span> =<\/span> useContext<\/span>(<\/span>TodoContext<\/span>)<\/span>\r\n  const<\/span> navigate<\/span> =<\/span> useNavigate<\/span>()<\/span>\r\n  const<\/span> params<\/span> =<\/span> useParams<\/span>()<\/span> \/\/\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089id\u53d6\u5f97<\/span>\r\n  \/*useEffect\u306fJSX\u751f\u6210\u5f8c\u306b\u547c\u3073\u51fa\u3055\u308c\u308b*\/<\/span>\r\n  useEffect<\/span>(()<\/span>=><\/span>{<\/span>\r\n    const<\/span> item<\/span> =<\/span> context<\/span>.<\/span>todos<\/span>.<\/span>find<\/span>((<\/span>item<\/span>)<\/span>=><\/span>item<\/span>.<\/span>id<\/span> ==<\/span> params<\/span>.<\/span>id<\/span>)<\/span>\r\n    setItem<\/span>(<\/span>item<\/span>)<\/span>\r\n  },[<\/span>params<\/span>.<\/span>id<\/span>,<\/span>context<\/span>])<\/span>\r\n\treturn <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h2<\/span>><\/span>TODO\u3092\u7de8\u96c6\u3059\u308b<\/<\/span>h2<\/span>><\/span>\r\n      {<\/span>\r\n        (<\/span>params<\/span>.<\/span>id<\/span> !=<\/span> d_item<\/span>.<\/span>id<\/span>)?<\/span>\r\n          <<\/span>div<\/span>><\/span>ID:{<\/span>params<\/span>.<\/span>id<\/span>}<\/span>\u306eTODO\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/<\/span>div<\/span>><\/span>\r\n        :<\/span>\r\n        <<\/span>table<\/span>><\/span>\r\n          <<\/span>thead<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30bf\u30a4\u30c8\u30eb<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u8aac\u660e<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30b9\u30c6\u30fc\u30bf\u30b9<\/<\/span>th<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>thead<\/span>><\/span>\r\n          <<\/span>tbody<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>title<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>description<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>status<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>tbody<\/span>><\/span>\r\n        <\/<\/span>table<\/span>><\/span>\r\n      }<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>navigate<\/span>(<\/span>\"<\/span>\/<\/span>\"<\/span>)<\/span>}<\/span> ><\/span>\u623b\u308b<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n\t)<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> EditTodo<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8euseEffect\u94a9\u5b50\u51fd\u6570\u662f\u5728DOM\u751f\u6210\u540e\u6267\u884c\u7684\uff0c\u6240\u4ee5\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u5728DOM\u751f\u6210\u4e4b\u524d\u5904\u7406\u53d8\u91cf\uff0c\u5426\u5219d_item.id\u5c06\u4fdd\u6301\u672a\u5b9a\u4e49\u72b6\u6001\uff0c\u4ece\u800c\u663e\u793a\u9519\u8bef\u3002<\/p>\n
\u7c7b\u578b\u9519\u8bef\uff1a\u65e0\u6cd5\u8bfb\u53d6\u672a\u5b9a\u4e49\u7684\u5c5e\u6027\uff08\u8bfb\u53d6’id’\uff09<\/div>\n
\u9009\u98792\uff1a\u81ea\u5b9a\u4e49\u7ec4\u4ef6\u5316\uff08\u4e0d\u9002\u5408\u5206\u5de5\u4f5c\u4e1a\uff09<\/h1>\n
\u5c07\u9019\u500b\u554f\u984c\u89e3\u6c7a\u7684\u5e38\u898b\u65b9\u6cd5\u662f\u5c07\u5176\u81ea\u5b9a\u7fa9\u70ba\u7d44\u4ef6\u3002\u5982\u679c\u5c07\u5176\u5b9a\u7fa9\u70ba\u81ea\u5b9a\u7fa9\u7d44\u4ef6\uff0c\u5247\u5728\u751f\u6210JSX\u4e4b\u524d\u5c07\u5c0d\u8c61\u5b9a\u7fa9\u70ba\u540d\u70bacustom\u7684\u8b8a\u6578\uff0c\u9019\u6a23\u8655\u7406\u672c\u6b21\u64cd\u4f5c\u4e5f\u80fd\u9806\u5229\u9032\u884c\u3002\u4f46\u7531\u65bc\u8b8a\u6578\u8655\u7406\u7684\u7de3\u6545\uff0c\u5c07\u5176\u7d44\u4ef6\u5316\u6703\u5c0e\u81f4\u6574\u500bJSX\u88ab\u5283\u5206\u70ba\u788e\u7247\uff0c\u9019\u6a23\u5f8c\u7e8c\u7684\u7dad\u8b77\u3001\u529f\u80fd\u64f4\u5c55\u548c\u8207\u8a2d\u8a08\u4eba\u54e1\u7684\u5206\u5de5\u90fd\u8b8a\u5f97\u56f0\u96e3\u3002\u6240\u4ee5\u5c0d\u6211\u4f86\u8aaa\uff0c\u9019\u4e0d\u662f\u4e00\u7a2e\u6211\u5f88\u60f3\u4f7f\u7528\u7684\u65b9\u6cd5\u3002\u6b64\u5916\uff0c\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u540d\u70bad_item\u7684\u8b8a\u6578\u5c0d\u6574\u500bJSX\u7522\u751f\u5f71\u97ff\uff0c\u6240\u4ee5\u81ea\u5b9a\u7fa9\u7d44\u4ef6\u672c\u8eab\u5c31\u8b8a\u5f97\u5197\u9577\u4e14\u96e3\u65bc\u63a7\u5236\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span> useState<\/span>,<\/span>useContext<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span>TodoContext<\/span>}<\/span> from<\/span> '<\/span>..\/App<\/span>'<\/span>\r\nimport<\/span> {<\/span>useParams<\/span>,<\/span>useNavigate<\/span> }<\/span> from<\/span> '<\/span>react-router-dom<\/span>'<\/span>\r\n\r\nconst<\/span> DetailTodo<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>d_item<\/span>,<\/span>setItem<\/span>]<\/span> =<\/span> useState<\/span>([])<\/span>\r\n  const<\/span> context<\/span> =<\/span> useContext<\/span>(<\/span>TodoContext<\/span>)<\/span>\r\n  const<\/span> navigate<\/span> =<\/span> useNavigate<\/span>()<\/span>\r\n  const<\/span> params<\/span> =<\/span> useParams<\/span>()<\/span> \/\/\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089id\u53d6\u5f97<\/span>\r\n\u3000<\/span>\/*\u30ab\u30b9\u30bf\u30e0\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306fJSX\u751f\u6210\u524d\u306b\u69cb\u7bc9\u3055\u308c\u308b\u306e\u3067\u3001d_item\u306e\u5909\u6570\u304c\u6e96\u5099\u3055\u308c\u305f\u72b6\u614b\u306b\u306f\u306a\u308b*\/<\/span>\r\n  const<\/span> Custom<\/span> =<\/span> ()<\/span>=><\/span>{<\/span>\r\n    const<\/span> item<\/span> =<\/span> context<\/span>.<\/span>todos<\/span>.<\/span>find<\/span>((<\/span>item<\/span>)<\/span>=><\/span> item<\/span>.<\/span>id<\/span> ==<\/span> params<\/span>.<\/span>id<\/span> )<\/span>\r\n    setItem<\/span>(<\/span>item<\/span>)<\/span>\r\n    return<\/span>(<\/span>\r\n        (<\/span>params<\/span>.<\/span>id<\/span> !=<\/span> d_item<\/span>.<\/span>id<\/span>)?<\/span>\r\n          <<\/span>div<\/span>><\/span>ID:{<\/span>params<\/span>.<\/span>id<\/span>}<\/span>\u306eTODO\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/<\/span>div<\/span>><\/span>\r\n        :<\/span>\r\n        <<\/span>table<\/span>><\/span>\r\n          <<\/span>thead<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30bf\u30a4\u30c8\u30eb<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u8aac\u660e<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30b9\u30c6\u30fc\u30bf\u30b9<\/<\/span>th<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>thead<\/span>><\/span>\r\n          <<\/span>tbody<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>title<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>description<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>status<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>tbody<\/span>><\/span>\r\n        <\/<\/span>table<\/span>><\/span>\r\n    )<\/span>\r\n  }<\/span>\r\n\treturn <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h2<\/span>><\/span>TODO\u3092\u7de8\u96c6\u3059\u308b<\/<\/span>h2<\/span>><\/span>\r\n      <<\/span>Custom<\/span> \/><\/span>{<\/span>\/*\u3053\u306e\u3088\u3046\u306b\u90e8\u54c1\u3092\u5206\u96e2\u3055\u308c\u308b\u3068\u3001\u30c7\u30b6\u30a4\u30ca\u30fc\u306b\u3068\u3063\u3066\u306f\u56f0\u3063\u305f\u8a18\u8ff0\u65b9\u6cd5\u3068\u306a\u308b*\/<\/span>}<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>{<\/span>navigate<\/span>(<\/span>\"<\/span>\/<\/span>\"<\/span>)}<\/span> }<\/span> ><\/span>\u623b\u308b<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n\t)<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> DetailTodo<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u7b2c\u4e09\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528useMemo\u94a9\u5b50\uff08\u4e0d\u5e38\u89c1\u7684\u65b9\u6cd5\uff09<\/h1>\n
\u56e0\u6b64\uff0c\u6211\u8ba4\u4e3a\u4f7f\u7528useMemo Hook\u6765\u8fdb\u884c\u8bb0\u5fc6\u5316\u53ef\u80fd\u662f\u4f5c\u4e3a\u60a8\u7684\u66ff\u4ee3\u65b9\u6cd5\u7684\u6709\u6548\u9009\u62e9\uff0c\u800c\u4e0d\u662f\u4f7f\u7528useEffect Hook\u8fdb\u884c\u81ea\u5b9a\u4e49\u7ec4\u4ef6\u5316\u3002\u5728\u6211\u4e4b\u524d\u63d0\u4f9b\u7684\u94fe\u63a5\u4e2d\uff0c\u4e5f\u6709\u56de\u7b54\u8005\u63d0\u5230\u4e86\u8fd9\u79cd\u66ff\u4ee3\u65b9\u6cd5\uff0c\u5e76\u4e14\u83b7\u5f97\u4e86\u4e00\u4e9b\u597d\u8bc4\uff0c\u867d\u7136\u8bc4\u4ef7\u4e0d\u591a\u3002<\/p>\n
\u5982\u4f55\u4f7f\u7528\u51fd\u6570\u7ec4\u4ef6\uff08\u4f7f\u7528\u7bad\u5934\u51fd\u6570\u8bed\u6cd5\uff09\u6307\u5b9a\u6784\u9020\u51fd\u6570\uff1f<\/p>\n
\u90a3\u4f4d\u56de\u7b54\u8005\u7684\u56de\u7b54\u662f\u8fd9\u6837\u7684\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684useMemo\u94a9\u5b50\u4f5c\u4e3a\u51fd\u6570\u7ec4\u4ef6\u7684\u6784\u9020\u51fd\u6570\u8fdb\u884c\u6f14\u793a\u3002\u6709\u4eba\u5efa\u8bae\u4f7f\u7528useEffect\uff0c\u4f46\u5b83\u4f1a\u5728\u6e32\u67d3\u540e\u88ab\u8c03\u7528\u3002<\/p><\/blockquote>\n
\u53e6\u5916\uff0c\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u4f3c\u4e4e\u4e5f\u4ecb\u7ecd\u4e86\u4e00\u79cd\u66ff\u4ee3\u65b9\u6cd5\u3002\u5c1d\u8bd5\u4f7f\u7528React Hooks\u5c06\u7c7b\u7ec4\u4ef6\u6539\u5199\u6210\u65e0\u72b6\u6001\u529f\u80fd\u7ec4\u4ef6\u3002<\/p>\n
useMemo\u30d5\u30c3\u30af\u306f\u3001\u672c\u6765\u306f\u6027\u80fd\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306b\u6642\u9593\u3084\u30e1\u30e2\u30ea\u3092\u5fc5\u8981\u3068\u3059\u308b\u51e6\u7406\u306b\u5bfe\u3057\u3066\u3001\u7279\u5b9a\u306e\u5909\u6570\u304c\u5909\u66f4\u3055\u308c\u305f\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\u3082\u306e\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u306euseMemo\u30d5\u30c3\u30af\u306fJSX\u751f\u6210\u524d\u306b\u51e6\u7406\u3055\u308c\u308b\u305f\u3081\u3001JSX\u751f\u6210\u6642\u306b\u306f\u65e2\u306b\u5909\u6570\u304c\u4ee3\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u4e0a\u8a18\u306e\u30a8\u30e9\u30fc\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span> useState<\/span>,<\/span>useContext<\/span>,<\/span>useMemo<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span>TodoContext<\/span>}<\/span> from<\/span> '<\/span>..\/App<\/span>'<\/span>\r\nimport<\/span> {<\/span>useParams<\/span>,<\/span>useNavigate<\/span> }<\/span> from<\/span> '<\/span>react-router-dom<\/span>'<\/span>\r\n\r\nconst<\/span> DetailTodo<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>d_item<\/span>,<\/span>setItem<\/span>]<\/span> =<\/span> useState<\/span>([])<\/span>\r\n  const<\/span> context<\/span> =<\/span> useContext<\/span>(<\/span>TodoContext<\/span>)<\/span>\r\n  const<\/span> navigate<\/span> =<\/span> useNavigate<\/span>()<\/span>\r\n  const<\/span> params<\/span> =<\/span> useParams<\/span>()<\/span> \/\/\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089id\u53d6\u5f97<\/span>\r\n  \/*useMemo\u306fJSX\u751f\u6210\u524d\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u306e\u3067\u3001setItem\u306b\u3088\u308b\u5909\u6570\u4ee3\u5165\u304c\u9593\u306b\u5408\u3046*\/<\/span>\r\n  useMemo<\/span>(()<\/span>=><\/span>{<\/span>\r\n    const<\/span> item<\/span> =<\/span> context<\/span>.<\/span>todos<\/span>.<\/span>find<\/span>((<\/span>item<\/span>)<\/span>=><\/span>item<\/span>.<\/span>id<\/span> ==<\/span> params<\/span>.<\/span>id<\/span>)<\/span>\r\n    setItem<\/span>(<\/span>item<\/span>)<\/span>\r\n  },[<\/span>params<\/span>.<\/span>id<\/span>,<\/span>context<\/span>])<\/span>\r\n\treturn <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h2<\/span>><\/span>TODO\u3092\u7de8\u96c6\u3059\u308b<\/<\/span>h2<\/span>><\/span>\r\n      {<\/span>\r\n        (<\/span>params<\/span>.<\/span>id<\/span> !=<\/span> d_item<\/span>.<\/span>id<\/span>)?<\/span>\r\n          <<\/span>div<\/span>><\/span>ID:{<\/span>params<\/span>.<\/span>id<\/span>}<\/span>\u306eTODO\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/<\/span>div<\/span>><\/span>\r\n        :<\/span>\r\n        <<\/span>table<\/span>><\/span>\r\n          <<\/span>thead<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30bf\u30a4\u30c8\u30eb<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u8aac\u660e<\/<\/span>th<\/span>><\/span>\r\n            <<\/span>th<\/span>><\/span>\u30b9\u30c6\u30fc\u30bf\u30b9<\/<\/span>th<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>thead<\/span>><\/span>\r\n          <<\/span>tbody<\/span>><\/span>\r\n            <<\/span>tr<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>title<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>description<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n              <<\/span>td<\/span>><\/span>{<\/span>d_item<\/span>.<\/span>status<\/span>}<\/span><\/<\/span>td<\/span>><\/span>\r\n            <\/<\/span>tr<\/span>><\/span>\r\n          <\/<\/span>tbody<\/span>><\/span>\r\n        <\/<\/span>table<\/span>><\/span>\r\n      }<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>navigate<\/span>(<\/span>\"<\/span>\/<\/span>\"<\/span>)<\/span>}<\/span> ><\/span>\u623b\u308b<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n\t)<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> DetailTodo<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u4e0d\u8fc7\uff0c\u5373\u4f7f\u5728\u67e5\u9605\u4e86React\u5b98\u65b9\u624b\u518c\u540e\uff0c\u4e5f\u6ca1\u6709\u627e\u5230\u8fd9\u79cd\u65b9\u6cd5\u3002\u56e0\u6b64\uff0c\u8fd9\u4e0d\u80fd\u88ab\u89c6\u4e3a\u4e00\u79cd\u5e38\u89c1\u7684\u89e3\u51b3\u65b9\u6cd5\uff0c\u6211\u60f3\u77e5\u9053\u662f\u5426\u5b58\u5728\u66f4\u5408\u9002\u7684\u65b9\u6cd5\u3002\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u5373\u4f7f\u4f7f\u7528React.memo\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0cd_item\u4e0d\u4f1a\u518d\u51fa\u73b0\u672a\u5b9a\u4e49\u7684\u9519\u8bef\uff0c\u4f46\u662f\u7531\u4e8e\u6ca1\u6709\u901a\u8fc7setItem\u65b9\u6cd5\u8fdb\u884c\u53d8\u91cf\u8d4b\u503c\uff0c\u5b83\u5c06\u4e3anull\uff08\u5df2\u9a8c\u8bc1\uff09\u3002<\/p>\n
\u53c2\u8003\u6587\u7ae0\uff1a
\nuseMemo\u3001useCallback\u548cReact.memo\u662f\u4ec0\u4e48\uff1f\u5b83\u4eec\u4e4b\u95f4\u6709\u4f55\u533a\u522b\uff1f<\/p>\n
\u7b2c\u56db\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528useCallback\u94a9\u5b50\uff08\u5e26\u6709\u6761\u4ef6\uff09<\/h1>\n
\u5728\u8fdb\u4e00\u6b65\u7684\u8c03\u67e5\u4e2d\uff0c\u6211\u8fd8\u53d1\u73b0\u4e86\u4f7f\u7528useCallback\u6302\u94a9\u7684\u4f8b\u5b50\uff0c\u5e76\u4e14\u4f7f\u7528\u8fd9\u4e2a\u4f8b\u5b50\u6210\u529f\u5730\u5c55\u793a\u4e86\u8be6\u7ec6\u9875\u9762\u3002\u6211\u8ba4\u4e3a\u8fd9\u66f4\u63a5\u8fd1React\u7684\u539f\u59cb\u4f7f\u7528\u65b9\u5f0f\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u4e0d\u4f7f\u7528useCallback\u6302\u94a9\u65f6\u8c03\u7528useState\u6302\u94a9\u4f1a\u5bfc\u81f4\u65e0\u9650\u5faa\u73af\u9519\u8bef\u3002<\/p>\n
\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u4ee5\u4e0b\u7684\u63cf\u8ff0\u4ecd\u7136\u662f\u4e00\u4e2a\u4e34\u65f6\u7b54\u6848\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span> useState<\/span>,<\/span>useContext<\/span>,<\/span>useCallback<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span>TodoContext<\/span>}<\/span> from<\/span> '<\/span>..\/App<\/span>'<\/span>\r\nimport<\/span> {<\/span>useParams<\/span>,<\/span>useNavigate<\/span> }<\/span> from<\/span> '<\/span>react-router-dom<\/span>'<\/span>\r\n\r\nconst<\/span> EditTodo<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>d_item<\/span>,<\/span>setItem<\/span>]<\/span> =<\/span> useState<\/span>([])<\/span>\r\n  const<\/span> context<\/span> =<\/span> useContext<\/span>(<\/span>TodoContext<\/span>)<\/span>\r\n  const<\/span> navigate<\/span> =<\/span> useNavigate<\/span>()<\/span>\r\n  const<\/span> params<\/span> =<\/span> useParams<\/span>()<\/span> \/\/\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089id\u53d6\u5f97<\/span>\r\n  const<\/span> getCallback<\/span> =<\/span> useCallback<\/span>(<\/span> ()<\/span>=><\/span>{<\/span>\r\n    const<\/span> item<\/span> =<\/span> context<\/span>.<\/span>todos<\/span>.<\/span>find<\/span>((<\/span>item<\/span>)<\/span>=><\/span>item<\/span>.<\/span>id<\/span> ==<\/span> params<\/span>.<\/span>id<\/span>)<\/span>\r\n    setItem<\/span>(<\/span>item<\/span>)<\/span>\r\n  },[<\/span>context<\/span>])<\/span>\r\n  getCallback<\/span>()<\/span> \/\/\u3053\u3053\u3067\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u8fd4\u3059<\/span>\r\n  \/\/\u66f4\u65b0<\/span>\r\n  const<\/span> hundle<\/span> =<\/span> (<\/span>e<\/span>)<\/span>=><\/span>{<\/span>\r\n    const<\/span> {<\/span>name<\/span>,<\/span>value<\/span>}<\/span> =<\/span> e<\/span>.<\/span>target<\/span>\r\n    setItem<\/span>({...<\/span>d_item<\/span>,[<\/span>name<\/span>]:<\/span>value<\/span>})<\/span>\r\n  }<\/span> \r\n  \/\/\u66f4\u65b0\u30dc\u30bf\u30f3\u62bc\u4e0b\u30a4\u30d9\u30f3\u30c8<\/span>\r\n  const<\/span> onSubmit<\/span> =<\/span> ()<\/span>=><\/span>{<\/span>\r\n    const<\/span> data<\/span> =<\/span> {<\/span>\r\n      title<\/span>:<\/span>d_item<\/span>.<\/span>title<\/span>,<\/span>\r\n      description<\/span>:<\/span>d_item<\/span>.<\/span>description<\/span>,<\/span>\r\n      str_status<\/span>:<\/span>d_item<\/span>.<\/span>str_status<\/span>,<\/span>\r\n    }<\/span>\r\n    context<\/span>.<\/span>updTodo<\/span>(<\/span>params<\/span>.<\/span>id<\/span>,<\/span>data<\/span>)<\/span>\r\n    navigate<\/span>(<\/span>'<\/span>\/<\/span>'<\/span>)<\/span> \/\/\u30c8\u30c3\u30d7\u30da\u30fc\u30b8\u306b\u9077\u79fb<\/span>\r\n  }<\/span>\r\n\treturn <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h2<\/span>><\/span>TODO\u3092\u7de8\u96c6\u3059\u308b<\/<\/span>h2<\/span>><\/span>\r\n      {<\/span>\r\n        (<\/span>params<\/span>.<\/span>id<\/span> !=<\/span> d_item<\/span>.<\/span>id<\/span>)?<\/span>\r\n          <<\/span>div<\/span>><\/span>ID:{<\/span>params<\/span>.<\/span>id<\/span>}<\/span>\u306eTODO\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/<\/span>div<\/span>><\/span>\r\n        :<\/span>\r\n          <><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n            <<\/span>label<\/span>><\/span>\u30bf\u30a4\u30c8\u30eb<\/<\/span>label<\/span>><\/span>\r\n            <<\/span>input<\/span> type<\/span>=<\/span>\"text\"<\/span> id<\/span>=<\/span>\"title\"<\/span> name<\/span>=<\/span>\"title\"<\/span> value<\/span>=<\/span>{<\/span>d_item<\/span>.<\/span>title<\/span>}<\/span> onChange<\/span>=<\/span>{<\/span>hundle<\/span>}<\/span>\/><\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n            <<\/span>label<\/span>><\/span>\u8aac\u660e<\/<\/span>label<\/span>><\/span>\r\n            <<\/span>textarea<\/span> id<\/span>=<\/span>\"description\"<\/span> name<\/span>=<\/span>\"description\"<\/span> value<\/span>=<\/span>{<\/span>d_item<\/span>.<\/span>description<\/span>}<\/span> onChange<\/span>=<\/span>{<\/span>hundle<\/span>}<\/span>\/><\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n          <<\/span>label<\/span>><\/span>\u30b9\u30c6\u30fc\u30bf\u30b9<\/<\/span>label<\/span>><\/span>\r\n            <<\/span>select<\/span> id<\/span>=<\/span>\"status\"<\/span> name<\/span>=<\/span>\"str_status\"<\/span> onChange<\/span>=<\/span>{<\/span>hundle<\/span>}<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"waiting\"<\/span>><\/span>waiting<\/<\/span>option<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"working\"<\/span>><\/span>working<\/<\/span>option<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"completed\"<\/span>><\/span>completed<\/<\/span>option<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"pending\"<\/span>><\/span>pending<\/<\/span>option<\/span>><\/span>\r\n            <\/<\/span>select<\/span>><\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n          <\/><\/span>\r\n      }<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>onSubmit<\/span>()<\/span>}<\/span>><\/span>\u66f4\u65b0\u3059\u308b<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n\t)<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> EditTodo<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u7136\u800c\uff0c\u5bf9\u4e8e\u5305\u542b\u52a8\u6001\u53d8\u5316\u7684\u4fee\u6b63\u9875\u9762\u7684\u60c5\u51b5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u65e0\u6cd5\u9002\u5e94\u3002<\/p>\n
\u65b9\u6cd5\u4e94\uff1a\u5229\u7528 useEffect \u94a9\u5b50\u548c useCallback \u94a9\u5b50\u3002<\/h1>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u6839\u636e\u4ee5\u4e0b\u7b54\u6848\u4f7f\u7528`useCallback`\u94a9\u5b50\u548c`useEffect`\u94a9\u5b50\u4e00\u8d77\u5c1d\u8bd5\u4f7f\u7528\uff0c\u53ef\u4ee5\u5f88\u597d\u5730\u5904\u7406\u5e76\u4e14\u4f7f\u7528\u94a9\u5b50\u7684\u65b9\u6cd5\u4e5f\u88ab\u8ba4\u4e3a\u662f\u5408\u9002\u7684\uff0c\u6240\u4ee5\u6211\u8ba4\u4e3a\u8fd9\u662f\u6700\u4f73\u5b9e\u8df5\u3002\u5982\u679c\u53ea\u4f7f\u7528`useEffect`\u94a9\u5b50\uff0c\u5b83\u4f1a\u5728`d_item`\u53d8\u91cf\u5206\u914d\u4e4b\u524d\u5c1d\u8bd5\u5c55\u5f00JSX\uff0c\u4f46\u662f\u5982\u679c\u4f7f\u7528`useCallback`\u94a9\u5b50\uff0c\u5b83\u5c06\u8bb0\u4f4f\u7b5b\u9009\u8fc7\u7a0b\u5e76\u4e3a\u6211\u4eec\u4fdd\u7559\u53d8\u91cf`d_item`\uff0c\u5e76\u4e14\u8fd8\u53ef\u4ee5\u901a\u8fc7`useEffect`\u94a9\u5b50\u548c`useState`\u94a9\u5b50\u8fdb\u884c\u72b6\u6001\u7ba1\u7406\u751f\u6210JSX\u540e\u3002<\/p>\n
\u5728\u51fd\u6570\u7ec4\u4ef6\uff08\u7bad\u5934\u51fd\u6570\uff09\u4e2d\u5982\u4f55\u4f7f\u7528\u6784\u9020\u51fd\u6570\uff1f<\/p>\n
import<\/span> React<\/span>,{<\/span> useState<\/span>,<\/span>useContext<\/span>,<\/span>useEffect<\/span>,<\/span>useCallback<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span>TodoContext<\/span>}<\/span> from<\/span> '<\/span>..\/App<\/span>'<\/span>\r\nimport<\/span> {<\/span>useParams<\/span>,<\/span>useNavigate<\/span> }<\/span> from<\/span> '<\/span>react-router-dom<\/span>'<\/span>\r\n\r\nconst<\/span> EditTodo<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>d_item<\/span>,<\/span>setItem<\/span>]<\/span> =<\/span> useState<\/span>([])<\/span>\r\n  const<\/span> context<\/span> =<\/span> useContext<\/span>(<\/span>TodoContext<\/span>)<\/span>\r\n  const<\/span> navigate<\/span> =<\/span> useNavigate<\/span>()<\/span>\r\n  const<\/span> params<\/span> =<\/span> useParams<\/span>()<\/span> \/\/\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089id\u53d6\u5f97<\/span>\r\n  const<\/span> getCallback<\/span> =<\/span> useCallback<\/span>(<\/span> async <\/span>(<\/span>todos<\/span>)<\/span>=><\/span>{<\/span>\r\n    const<\/span> item<\/span> =<\/span> await<\/span> todos<\/span>.<\/span>find<\/span>((<\/span>item<\/span>)<\/span>=><\/span>item<\/span>.<\/span>id<\/span> ==<\/span> params<\/span>.<\/span>id<\/span>)<\/span>\r\n    setItem<\/span>(<\/span>item<\/span>)<\/span>\r\n  },[<\/span>params<\/span>.<\/span>id<\/span>])<\/span>\r\n  useEffect<\/span>(()<\/span>=><\/span>\r\n    getCallback<\/span>(<\/span>context<\/span>.<\/span>todos<\/span>)<\/span> \/\/useEffect\u30d5\u30c3\u30af\u304b\u3089\u5909\u6570\u51e6\u7406\u3092\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3059\u308b<\/span>\r\n   ,[<\/span>context<\/span>,<\/span>getCallback<\/span>])<\/span>\r\n  \/\/\u66f4\u65b0<\/span>\r\n  const<\/span> hundle<\/span> =<\/span> (<\/span>e<\/span>)<\/span>=><\/span>{<\/span>\r\n    const<\/span> {<\/span>name<\/span>,<\/span>value<\/span>}<\/span> =<\/span> e<\/span>.<\/span>target<\/span>\r\n    setItem<\/span>({...<\/span>d_item<\/span>,[<\/span>name<\/span>]:<\/span>value<\/span>})<\/span>\r\n  }<\/span> \r\n  \/\/\u66f4\u65b0\u30dc\u30bf\u30f3\u62bc\u4e0b\u30a4\u30d9\u30f3\u30c8<\/span>\r\n  const<\/span> onSubmit<\/span> =<\/span> ()<\/span>=><\/span>{<\/span>\r\n    const<\/span> data<\/span> =<\/span> {<\/span>\r\n      title<\/span>:<\/span>d_item<\/span>.<\/span>title<\/span>,<\/span>\r\n      description<\/span>:<\/span>d_item<\/span>.<\/span>description<\/span>,<\/span>\r\n      str_status<\/span>:<\/span>d_item<\/span>.<\/span>str_status<\/span>,<\/span>\r\n    }<\/span>\r\n    context<\/span>.<\/span>updTodo<\/span>(<\/span>params<\/span>.<\/span>id<\/span>,<\/span>data<\/span>)<\/span>\r\n    navigate<\/span>(<\/span>'<\/span>\/<\/span>'<\/span>)<\/span> \/\/\u30c8\u30c3\u30d7\u30da\u30fc\u30b8\u306b\u9077\u79fb<\/span>\r\n  }<\/span>\r\n\treturn <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h2<\/span>><\/span>TODO\u3092\u7de8\u96c6\u3059\u308b<\/<\/span>h2<\/span>><\/span>\r\n      {<\/span>\r\n        (<\/span>params<\/span>.<\/span>id<\/span> !=<\/span> d_item<\/span>.<\/span>id<\/span>)?<\/span>\r\n          <<\/span>div<\/span>><\/span>ID:{<\/span>params<\/span>.<\/span>id<\/span>}<\/span>\u306eTODO\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/<\/span>div<\/span>><\/span>\r\n        :<\/span>\r\n          <><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n            <<\/span>label<\/span>><\/span>\u30bf\u30a4\u30c8\u30eb<\/<\/span>label<\/span>><\/span>\r\n            <<\/span>input<\/span> type<\/span>=<\/span>\"text\"<\/span> id<\/span>=<\/span>\"title\"<\/span> name<\/span>=<\/span>\"title\"<\/span> value<\/span>=<\/span>{<\/span>d_item<\/span>.<\/span>title<\/span>}<\/span> onChange<\/span>=<\/span>{<\/span>hundle<\/span>}<\/span>\/><\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n            <<\/span>label<\/span>><\/span>\u8aac\u660e<\/<\/span>label<\/span>><\/span>\r\n            <<\/span>textarea<\/span> id<\/span>=<\/span>\"description\"<\/span> name<\/span>=<\/span>\"description\"<\/span> value<\/span>=<\/span>{<\/span>d_item<\/span>.<\/span>description<\/span>}<\/span> onChange<\/span>=<\/span>{<\/span>hundle<\/span>}<\/span>\/><\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n          <<\/span>label<\/span>><\/span>\u30b9\u30c6\u30fc\u30bf\u30b9<\/<\/span>label<\/span>><\/span>\r\n            <<\/span>select<\/span> id<\/span>=<\/span>\"status\"<\/span> name<\/span>=<\/span>\"str_status\"<\/span> onChange<\/span>=<\/span>{<\/span>hundle<\/span>}<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"waiting\"<\/span>><\/span>waiting<\/<\/span>option<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"working\"<\/span>><\/span>working<\/<\/span>option<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"completed\"<\/span>><\/span>completed<\/<\/span>option<\/span>><\/span>\r\n              <<\/span>option<\/span> value<\/span>=<\/span>\"pending\"<\/span>><\/span>pending<\/<\/span>option<\/span>><\/span>\r\n            <\/<\/span>select<\/span>><\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n          <\/><\/span>\r\n      }<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span>=><\/span>onSubmit<\/span>()<\/span>}<\/span>><\/span>\u66f4\u65b0\u3059\u308b<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n\t)<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> EditTodo<\/span>\r\n<\/code><\/pre>\n
Option 1:<\/h1>\n
\u7b2c\u516d\u79cd\u65b9\u6cd5\uff1a\u5728\u51fd\u6570\u7ec4\u4ef6\u5185\u76f4\u63a5\u5199\u5165\uff08\u6b64\u79cd\u5199\u6cd5\u76ee\u524d\u4e0d\u63a8\u8350\uff09\u3002<\/p>\n
\u6211\u8bd5\u7740\u50cfVue3\u7684composition API\u6216Svelte\u7684setup\u65b9\u6cd5\u4e00\u6837\u76f4\u63a5\u7f16\u5199\uff0c\u770b\u770b\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002\u5982\u679c\u53ea\u662f\u7b80\u5355\u5730\u5c06\u53d8\u91cf\u8d4b\u503c\u5e76\u5f15\u7528\u7ed3\u679c\uff0c\u5c31\u50cf\u8be6\u7ec6\u9875\u9762\u4e00\u6837\uff0c\u8fd9\u79cd\u65b9\u5f0f\u4f3c\u4e4e\u6ca1\u6709\u95ee\u9898\uff0c\u800c\u4e14\u5b98\u65b9\u6559\u7a0b\u4e2d\u4e5f\u6709\u5b9e\u9645\u793a\u4f8b\u3002<\/p>\n
import<\/span> React<\/span>,{<\/span> useState<\/span>,<\/span>useContext<\/span>,<\/span>useCallback<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>\r\nimport<\/span> {<\/span>TodoContext<\/span>}<\/span> from<\/span> '<\/span>..\/App<\/span>'<\/span>\r\nimport<\/span> {<\/span>useParams<\/span>,<\/span>useNavigate<\/span> }<\/span> from<\/span> '<\/span>react-router-dom<\/span>'<\/span>\r\n\r\nconst<\/span> DetailTodo<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>d_item<\/span>,<\/span>setItem<\/span>]<\/span> =<\/span> useState<\/span>([])<\/span>\r\n  const<\/span> context<\/span> =<\/span> useContext<\/span>(<\/span>TodoContext<\/span>)<\/span>\r\n  const<\/span> navigate<\/span> =<\/span> useNavigate<\/span>()<\/span>\r\n  const<\/span> params<\/span> =<\/span> useParams<\/span>()<\/span> \/\/\u30d1\u30e9\u30e1\u30fc\u30bf\u304b\u3089id\u53d6\u5f97<\/span>\r\n  const<\/span> d_item<\/span> =<\/span> context<\/span>.<\/span>todos<\/span>.<\/span>find<\/span>((<\/span>item<\/span>)<\/span>=><\/span>item<\/span>.<\/span>id<\/span> ==<\/span> params<\/span>.<\/span>id<\/span>)<\/span>\r\n<\/code><\/pre>\n
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\u7e3d\u7d50<\/h1>\n
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