{"id":38198,"date":"2023-05-24T03:17:33","date_gmt":"2023-10-07T20:20:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react-hooks%e6%91%98%e8%a6%81\/"},"modified":"2024-04-30T05:41:45","modified_gmt":"2024-04-29T21:41:45","slug":"react-hooks%e6%91%98%e8%a6%81","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react-hooks%e6%91%98%e8%a6%81\/","title":{"rendered":"React Hooks\u6458\u8981"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u6211\u662f\u4e00\u540d\u65b0\u5165\u804c\u7684\u5de5\u7a0b\u5e08\u3002\u8fd9\u7bc7\u6587\u7ae0\u662f\u4e3a\u4e86\u8fbe\u5230\u4e00\u4e2a\u76ee\u7684\u800c\u5f00\u59cb\u5199\u7684\uff0c\u90a3\u5c31\u662f\u4e3a\u4e86\u80fd\u968f\u65f6\u56de\u987e\u5b66\u4e60\u4e2d\u7684React\u529f\u80fd\u4e4b\u4e00\u2014\u2014Hooks\uff0c\u5e76\u5e0c\u671b\u80fd\u591f\u6210\u4e3a\u4e00\u4e2a\u6709\u7528\u7684\u53c2\u8003\u3002<\/p>\n

React Hooks\u603b\u7ed3 \u7b2c\u4e00\u5377<\/h1>\n

\u9996\u5148\uff0c\u5173\u4e8eReact\u7684\u60c5\u51b5\u5982\u4e0b\u3002<\/p>\n

React\u662f\u7528\u4e8eWeb\u548c\u672c\u5730\u7528\u6237\u754c\u9762\u7684\u5e93\uff0c\u53ef\u4ee5\u4f7f\u7528\u7ec4\u4ef6\u6765\u521b\u5efa\u7528\u6237\u754c\u9762\u3002<\/p><\/blockquote>\n

 <\/p>\n

1. Hooks \u662f\u4ec0\u4e48\uff1f<\/h2>\n

React Hooks\u662f\u4e00\u79cd\u529f\u80fd\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u5728React\u4e2d\u5904\u7406\u72b6\u6001\u5e76\u5b9e\u73b0\u4e0e\u751f\u547d\u5468\u671f\u76f8\u5173\u7684\u64cd\u4f5c\uff0c\u800c\u65e0\u9700\u4f7f\u7528\u7c7b\u3002\u5229\u7528React Hooks\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u7b80\u6d01\u6613\u8bfb\u7684\u4ee3\u7801\u3002<\/p><\/blockquote>\n

 <\/p>\n

2. \u4f7f\u7528 useState \u94a9\u5b50<\/h2>\n

useState\u94a9\u5b50\u7528\u4e8e\u5728\u51fd\u6570\u7ec4\u4ef6\u5185\u5f15\u5165\u72b6\u6001\u3002<\/p>\n

useState\u53ef\u4ee5\u6301\u6709\u72ec\u7acb\u7684\u503c\uff0c\u56e0\u6b64\u53ef\u4ee5\u5728\u4e00\u4e2a\u7ec4\u4ef6\u4e2d\u7ba1\u7406\u591a\u4e2a\u72b6\u6001\u3002\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u5904\u7406\u590d\u6742\u6570\u636e\uff0c\u5982\u6570\u7ec4\u548c\u5bf9\u8c61\u3002\u6bcf\u4e2auseState\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u72ec\u7acb\u7684\u72b6\u6001\uff0c\u56e0\u6b64\u53ef\u4ee5\u591a\u6b21\u8c03\u7528useState\u6765\u4fdd\u6301\u4e0d\u540c\u7684\u503c\u3002<\/p><\/blockquote>\n

 <\/p>\n

\u4e0b\u9762\u662fuseState\u7684\u57fa\u672c\u4f7f\u7528\u793a\u4f8b\u3002<\/p>\n

import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> ExampleComponent<\/span>()<\/span> {<\/span>\r\n  const<\/span> [<\/span>count<\/span>,<\/span> setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u73fe\u5728\u306e\u30ab\u30a6\u30f3\u30c8: {<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> setCount<\/span>(<\/span>count<\/span> +<\/span> 1<\/span>)<\/span>}<\/span>><\/span>\u30ab\u30a6\u30f3\u30c8\u3092\u5897\u3084\u3059<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u4f7f\u7528useState\uff0c\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6bcf\u6b21\u70b9\u51fb\u6309\u94ae\u90fd\u4f1a\u52a01\u3002<\/p>\n
\u5b9e\u9645\u64cd\u4f5c\u60c5\u51b5<\/div>\n
 <\/p>\n
3. useEffect\u94a9\u5b50<\/h2>\n
useEffect\u94a9\u5b50\u7528\u4e8e\u5904\u7406\u7ec4\u4ef6\u7684\u526f\u4f5c\u7528\uff08\u4f8b\u5982API\u8c03\u7528\u3001\u8ba2\u9605\u3001\u6570\u636e\u66f4\u6539\u7b49\uff09\u3002<\/p>\n
\u4f7f\u7528useEffect\u53ef\u4ee5\u5c06\u51fd\u6570\u7684\u6267\u884c\u65f6\u673a\u63a8\u8fdf\u5230React\u6e32\u67d3\u540e\u3002\u5728useEffect\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u7ec4\u4ef6\u5378\u8f7d\u65f6\u89e3\u9664\u5728\u7ec4\u4ef6\u6302\u8f7d\u65f6\u8fdb\u884c\u7684\u5904\u7406\u3002\u526f\u4f5c\u7528\u51fd\u6570\u662f\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u4f1a\u6267\u884c\u7684\u673a\u5236\u3002<\/p><\/blockquote>\n
 <\/p>\n
\u4ee5\u4e0b\u662f`useEffect`\u7684\u57fa\u672c\u4f7f\u7528\u793a\u4f8b\u3002<\/p>\n
import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> DataFetchingComponent<\/span>()<\/span> {<\/span>\r\n  const<\/span> [<\/span>data<\/span>,<\/span> setData<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>null<\/span>);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    \/\/ \u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u30ed\u30b8\u30c3\u30af<\/span>\r\n    const<\/span> fetchData<\/span> =<\/span> async <\/span>()<\/span> =><\/span> {<\/span>\r\n      try<\/span> {<\/span>\r\n        const<\/span> result<\/span> =<\/span> await<\/span> fetch<\/span>(<\/span>'<\/span>https:\/\/jsonplaceholder.typicode.com\/todos\/1<\/span>'<\/span>);<\/span>\r\n        const<\/span> jsonData<\/span> =<\/span> await<\/span> result<\/span>.<\/span>json<\/span>();<\/span>\r\n        setData<\/span>(<\/span>jsonData<\/span>);<\/span>\r\n      }<\/span> catch <\/span>(<\/span>error<\/span>)<\/span> {<\/span>\r\n        console<\/span>.<\/span>error<\/span>(<\/span>'<\/span>\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u306b\u5931\u6557\u3057\u307e\u3057\u305f:<\/span>'<\/span>,<\/span> error<\/span>);<\/span>\r\n      }<\/span>\r\n    };<\/span>\r\n    \r\n    fetchData<\/span>();<\/span>\/\/ \u4f9d\u5b58\u914d\u5217\u304c\u7a7a\u306e\u5834\u5408\u3001\u30de\u30a6\u30f3\u30c8\u6642\u306b\u306e\u307f\u5b9f\u884c<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf: {<\/span>data<\/span> ?<\/span> JSON<\/span>.<\/span>stringify<\/span>(<\/span>data<\/span>)<\/span> :<\/span> '<\/span>\u30c7\u30fc\u30bf\u306a\u3057<\/span>'<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u8ff0\u7684\u4ee3\u7801\u5177\u6709\u4ee5\u4e0b\u7684\u7ed3\u6784\u3002<\/p>\n
\u51fd\u6570\u7ec4\u4ef6\u7684\u5b9a\u4e49<\/h3>\n
function<\/span> DataFetchingComponent<\/span>()<\/span> {<\/span>\r\n  \/\/ ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3aDataFetchingComponent\u7684React\u51fd\u6570\u7ec4\u4ef6\u3002<\/p>\n
\u56fd\u5bb6\u7684\u8bbe\u7f6e<\/h3>\n
const<\/span> [<\/span>data<\/span>,<\/span> setData<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>null<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528useState\u94a9\u5b50\u6765\u7ba1\u7406\u7ec4\u4ef6\u7684\u72b6\u6001\u3002data\u5b58\u50a8\u83b7\u53d6\u5230\u7684\u6570\u636e\uff0csetData\u662f\u7528\u6765\u66f4\u65b0\u6570\u636e\u7684\u51fd\u6570\u3002\u521d\u59cb\u503c\u8bbe\u7f6e\u4e3anull\u3002<\/p>\n
\u4f7f\u7528 useEffect \u94a9\u5b50<\/h3>\n
useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n  \/\/ ...<\/span>\r\n},<\/span> []);<\/span> \/\/ \u4f9d\u5b58\u914d\u5217\u304c\u7a7a\u306e\u5834\u5408\u3001\u30de\u30a6\u30f3\u30c8\u6642\u306b\u306e\u307f\u5b9f\u884c<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5305\u542b\u4e86\u6570\u636e\u83b7\u53d6\u903b\u8f91\u3002
\nuseEffect \u94a9\u5b50\u51fd\u6570\u88ab\u7528\u4e8e\u5728 React \u7ec4\u4ef6\u6e32\u67d3\u540e\u6267\u884c\u5f02\u6b65\u6216\u6709\u526f\u4f5c\u7528\u7684\u64cd\u4f5c\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6307\u5b9a\u4e86 useEffect \u94a9\u5b50\u51fd\u6570\u4f9d\u8d56\u7684\u503c\u7684\u6570\u7ec4\u3002\u5f53\u8fd9\u4e9b\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0cuseEffect \u5c06\u518d\u6b21\u6267\u884c\u3002\u7136\u800c\uff0c\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0cuseEffect \u5c06\u53ea\u5728\u521d\u59cb\u6e32\u67d3\u65f6\u6267\u884c\u4e00\u6b21\uff0c\u5e76\u5728\u540e\u7eed\u91cd\u65b0\u6e32\u67d3\u65f6\u4e0d\u518d\u6267\u884c\u3002<\/p>\n
\u83b7\u53d6\u6570\u636e\u7684\u903b\u8f91 de<\/h3>\n
const<\/span> fetchData<\/span> =<\/span> async <\/span>()<\/span> =><\/span> {<\/span>\r\n  try<\/span> {<\/span>\r\n    const<\/span> result<\/span> =<\/span> await<\/span> fetch<\/span>(<\/span>'<\/span>https:\/\/jsonplaceholder.typicode.com\/todos\/1<\/span>'<\/span>);<\/span>\r\n    const<\/span> jsonData<\/span> =<\/span> await<\/span> result<\/span>.<\/span>json<\/span>();<\/span>\r\n    setData<\/span>(<\/span>jsonData<\/span>);<\/span>\r\n  }<\/span> catch <\/span>(<\/span>error<\/span>)<\/span> {<\/span>\r\n    console<\/span>.<\/span>error<\/span>(<\/span>'<\/span>\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u306b\u5931\u6557\u3057\u307e\u3057\u305f:<\/span>'<\/span>,<\/span> error<\/span>);<\/span>\r\n  }<\/span>\r\n};<\/span>\r\n\r\nfetchData<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u30fbconst fetchData = async () => { … }: fetchData\u51fd\u6570\u88ab\u58f0\u660e\u4e3a\u5f02\u6b65\u51fd\u6570\u3002\u5176\u4e2d\u5305\u542b\u83b7\u53d6\u6570\u636e\u7684\u903b\u8f91\u3002
\n\u901a\u8fc7\u4f7f\u7528async\u5173\u952e\u5b57\uff0c\u53ef\u4ee5\u6682\u505c\u6267\u884c\u4e0b\u4e00\u884c\u4ee3\u7801\uff0c\u76f4\u5230Promise\u88ab\u89e3\u6790\u4e3a\u6b62\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cfetch\u51fd\u6570\u8fd4\u56de\u4e00\u4e2aPromise\uff0c\u6240\u4ee5\u5728\u8be5\u7ed3\u679c\u88ab\u89e3\u6790\u4e4b\u524d\uff0c\u8be5\u5904\u7406\u5c06\u7b49\u5f85\uff0c\u5e76\u968f\u540e\u6267\u884c\u4e0b\u4e00\u884c\u4ee3\u7801\u3002<\/p>\n
\u4f7f\u7528try-catch\u5757\u8fdb\u884c\u9519\u8bef\u5904\u7406\uff1a\u5982\u679c\u6210\u529f\u83b7\u53d6\u6570\u636e\uff0c\u5219\u4f7f\u7528setData\u5c06\u83b7\u53d6\u7684\u6570\u636e\u8bbe\u7f6e\u4e3a\u7ec4\u4ef6\u7684\u72b6\u6001\u3002\u5982\u679c\u53d1\u751f\u9519\u8bef\uff0c\u5219\u5c06\u9519\u8bef\u6d88\u606f\u8f93\u51fa\u5230\u63a7\u5236\u53f0\u3002<\/p>\n
\u30fbfetchData();\uff1afetchData\u51fd\u6570\u5c06\u5728\u7ec4\u4ef6\u6302\u8f7d\u65f6\u6267\u884c\u3002<\/p>\n
\u7ec4\u4ef6\u7684\u6e32\u67d3<\/h3>\n
Copy<\/span> code<\/span>\r\nreturn <\/span>(<\/span>\r\n  <<\/span>div<\/span>><\/span>\r\n    <<\/span>p<\/span>><\/span>\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf: {<\/span>data<\/span> ?<\/span> JSON<\/span>.<\/span>stringify<\/span>(<\/span>data<\/span>)<\/span> :<\/span> '<\/span>\u30c7\u30fc\u30bf\u306a\u3057<\/span>'<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n  <\/<\/span>div<\/span>><\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u6700\u540e\uff0c\u7ec4\u4ef6\u5c06\u8fd4\u56deJSX\u4ee5\u663e\u793a\u83b7\u53d6\u5230\u7684\u6570\u636e\u3002\u5982\u679c\u6570\u636e\u5b58\u5728\uff0c\u5219\u5c06\u5176\u8f6c\u6362\u4e3aJSON\u5b57\u7b26\u4e32\u8fdb\u884c\u663e\u793a\uff1b\u5982\u679c\u6570\u636e\u4e0d\u5b58\u5728\uff0c\u5219\u663e\u793a”\u65e0\u6570\u636e”\u3002<\/p>\n
\u5b9e\u9645\u64cd\u4f5c<\/div>\n
 <\/p>\n
4. \u4f7f\u7528useContext\u94a9\u5b50<\/h2>\n
useContext\u94a9\u5b50\u662f\u7528\u4e8e\u901a\u8fc7React\u4e0a\u4e0b\u6587\u5728\u7ec4\u4ef6\u6811\u4e2d\u4f20\u9012\u503c\u7684\u3002<\/p>\n
\u4e3a\u4e86\u4e0eReact\u7ec4\u4ef6\u6811\u4e2d\u88ab\u89c6\u4e3a\u201c\u5168\u5c40\u201d\u7684\u6570\u636e\u8fdb\u884c\u4ea4\u4e92\u800c\u8bbe\u8ba1\u3002
\n\u7531\u4e8e\u5b83\u4f7f\u5f97\u7ec4\u4ef6\u7684\u91cd\u590d\u5229\u7528\u66f4\u52a0\u56f0\u96be\uff0c\u56e0\u6b64\u5fc5\u987b\u8c28\u614e\u4f7f\u7528\u3002
\n\u901a\u8fc7\u4e0a\u4e0b\u6587\uff0c\u4e0d\u518d\u9700\u8981\u5c06\u6570\u636e\u5728\u6bcf\u4e2a\u5c42\u7ea7\u4f20\u9012\uff0c\u800c\u662f\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u5d4c\u5165\u5728\u4e0a\u4e0b\u6587\u4e2d\u7684\u6570\u636e\uff0c\u65e0\u9700\u8fdb\u884cprops\u4f20\u9012\u7684\u4e00\u7cfb\u5217\u64cd\u4f5c\u3002<\/p><\/blockquote>\n
 <\/p>\n
\u4ee5\u4e0b\u662fuseContext\u7684\u57fa\u672c\u7528\u6cd5\u793a\u4f8b\u3002<\/p>\n
import<\/span> React<\/span>,<\/span> {<\/span> useContext<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> ThemeContext<\/span> =<\/span> React<\/span>.<\/span>createContext<\/span>();<\/span>\r\n\r\nfunction<\/span> ThemedComponent<\/span>()<\/span> {<\/span>\r\n  const<\/span> theme<\/span> =<\/span> useContext<\/span>(<\/span>ThemeContext<\/span>);<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>{<\/span> background<\/span>:<\/span> theme<\/span>.<\/span>background<\/span>,<\/span> color<\/span>:<\/span> theme<\/span>.<\/span>color<\/span>}<\/span>}<\/span>><\/span>\r\n      \u30c6\u30fc\u30de\u306b\u57fa\u3065\u304f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efa\u8bed\u5883<\/h3>\n
const<\/span> ThemeContext<\/span> =<\/span> createContext<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528createContext\u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u4e0a\u4e0b\u6587\u5bf9\u8c61\u3002\u8fd9\u4e2a\u4e0a\u4e0b\u6587\u5bf9\u8c61\u63d0\u4f9b\u4e86\u5728ThemedComponent\u5185\u90e8\u4f7f\u7528\u7684\u4e3b\u9898\u4fe1\u606f\u3002<\/p>\n
\u4e3b\u9898\u5316\u7ec4\u4ef6<\/h3>\n
function<\/span> ThemedComponent<\/span>()<\/span> {<\/span>\r\n  const<\/span> theme<\/span> =<\/span> useContext<\/span>(<\/span>ThemeContext<\/span>);<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>{<\/span> background<\/span>:<\/span> theme<\/span>.<\/span>background<\/span>,<\/span> color<\/span>:<\/span> theme<\/span>.<\/span>text<\/span> }<\/span>}<\/span>><\/span>\r\n      \u30c6\u30fc\u30de\u306b\u57fa\u3065\u304f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
ThemedComponent\u4f7f\u7528useContext\u94a9\u5b50\u4eceThemeContext\u83b7\u53d6\u4e3b\u9898\u4fe1\u606f\u3002useContext\u662f\u7528\u4e8e\u5728React\u7ec4\u4ef6\u5185\u8bbf\u95ee\u4e0a\u4e0b\u6587\u503c\u7684\u94a9\u5b50\u3002<\/p>\n
useContext\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\u4f5c\u4e3a\u76ee\u6807\u4e0a\u4e0b\u6587\u5bf9\u8c61\uff0c\u5e76\u8fd4\u56de\u8be5\u4e0a\u4e0b\u6587\u63d0\u4f9b\u7684\u503c\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5c06ThemeContext\u63d0\u4f9b\u7684\u4e3b\u9898\u4fe1\u606f\u5b58\u50a8\u5728theme\u53d8\u91cf\u4e2d\u3002<\/p>\n
\u6700\u7ec8\uff0cThemedComponent\u4f1a\u6e32\u67d3\u4e00\u4e2adiv\u5143\u7d20\uff0c\u5e76\u6839\u636etheme.background\u548ctheme.color\u6765\u8bbe\u7f6e\u5176\u6837\u5f0f\u3002\u8fd9\u5c06\u663e\u793a\u4e00\u4e2a\u5e94\u7528\u4e86\u57fa\u4e8e\u4e3b\u9898\u7684\u6837\u5f0f\u7684\u7ec4\u4ef6\u3002<\/p>\n
\u4f7f\u7528\u4e0a\u4e0b\u6587<\/h3>\n
ThemedComponent\u9700\u8981\u5728\u7236\u7ec4\u4ef6\u4e2d\u4f7f\u7528ThemeContext.Provider\u6765\u8bbe\u7f6e\u4e0a\u4e0b\u6587\u7684\u503c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u5b8c\u6210\u3002<\/p>\n
function<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> themeValue<\/span> =<\/span> {<\/span> background<\/span>:<\/span> '<\/span>lightblue<\/span>'<\/span>,<\/span> text<\/span>:<\/span> '<\/span>darkblue<\/span>'<\/span> };<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>ThemeContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>themeValue<\/span>}<\/span>><\/span>\r\n      <<\/span>ThemedComponent<\/span> \/><\/span>\r\n    <\/<\/span>ThemeContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u5728\u7236\u7ec4\u4ef6\u4e2d\u4f7f\u7528ThemeContext.Provider\u6765\u63d0\u4f9b\u4e0a\u4e0b\u6587\u7684\u503c\uff0c\u8fd9\u6837ThemedComponent\u7ec4\u4ef6\u5c31\u53ef\u4ee5\u4f7f\u7528useContext\u6765\u8bbf\u95ee\u8fd9\u4e2a\u503c\u3002<\/p>\n
\u5b9e\u9645\u64cd\u4f5c<\/div>\n
 <\/p>\n
5. \u5176\u4ed6\u7684\u94a9\u5b50<\/h2>\n
React\u5728Hooks\u4e2d\u8fd8\u6709\u8bb8\u591a\u5176\u4ed6\u9009\u9879\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f8b\u5b50\u3002\u5173\u4e8e\u4ee5\u4e0bHooks\uff0c\u6211\u4eec\u5c06\u5728\u7b2c\u4e8c\u90e8\u5206\u4e2d\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n
\u00b7 useReducer\uff1a\u7528\u4e8e\u5904\u7406\u590d\u6742\u72b6\u6001\u903b\u8f91\u7684\u94a9\u5b50\u3002
\n\u00b7 useCallback \u548c useMemo\uff1a\u7528\u4e8e\u6027\u80fd\u4f18\u5316\u7684\u56de\u8c03\u548c\u8bb0\u5fc6\u5316\u3002
\n\u00b7 useRef\uff1a\u521b\u5efa\u53ca\u4fdd\u6301 Ref \u5bf9\u8c61\u7684\u94a9\u5b50\u3002
\n\u00b7 \u8fd8\u6709\u8bb8\u591a\u5176\u4ed6…<\/p>\n
\uff16\uff0e\u603b\u7ed3<\/h2>\n
\u8fd9\u6b21\u53ea\u6d89\u53ca\u5230\u4e09\u79cd\u94a9\u5b50\uff0c\u4f46\u6211\u4f1a\u9010\u4e00\u603b\u7ed3\u5176\u4ed6\u94a9\u5b50\u3002\u867d\u7136\u6211\u5728\u521b\u5efa\u8fc7\u7a0b\u4e2d\u5bf9\u5b9e\u9645\u5e94\u7528\u548c\u7f3a\u70b9\u7b49\u65b9\u9762\u5e76\u4e0d\u5b8c\u5168\u7406\u89e3\uff0c\u6240\u4ee5\u6211\u4f1a\u5728\u56de\u987e\u6587\u7ae0\u7684\u540c\u65f6\uff0c\u91cd\u65b0\u5b66\u4e60\u5e76\u6df1\u5165\u7406\u89e3\u3002<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148 \u6211\u662f\u4e00\u540d\u65b0\u5165\u804c\u7684\u5de5\u7a0b\u5e08\u3002\u8fd9\u7bc7\u6587\u7ae0\u662f\u4e3a\u4e86\u8fbe\u5230\u4e00\u4e2a\u76ee\u7684\u800c\u5f00\u59cb\u5199\u7684\uff0c\u90a3\u5c31\u662f\u4e3a\u4e86\u80fd\u968f\u65f6\u56de\u987e\u5b66\u4e60\u4e2d\u7684React\u529f\u80fd […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38198","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nReact Hooks\u6458\u8981 - 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\/react-hooks\u6458\u8981\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React Hooks\u6458\u8981\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u6211\u662f\u4e00\u540d\u65b0\u5165\u804c\u7684\u5de5\u7a0b\u5e08\u3002\u8fd9\u7bc7\u6587\u7ae0\u662f\u4e3a\u4e86\u8fbe\u5230\u4e00\u4e2a\u76ee\u7684\u800c\u5f00\u59cb\u5199\u7684\uff0c\u90a3\u5c31\u662f\u4e3a\u4e86\u80fd\u968f\u65f6\u56de\u987e\u5b66\u4e60\u4e2d\u7684React\u529f\u80fd […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/react-hooks\u6458\u8981\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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