{"id":38718,"date":"2023-10-28T17:17:08","date_gmt":"2022-12-29T03:03:31","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react-hooks%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f-2\/"},"modified":"2024-05-04T06:26:39","modified_gmt":"2024-05-03T22:26:39","slug":"react-hooks%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react-hooks%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f-2\/","title":{"rendered":"React Hooks\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u7531\u4e8e\u5728\u516c\u53f8\u5185\u8fdb\u884c\u4e86React Hooks\u5b66\u4e60\u4f1a\uff0c\u4f5c\u4e3a\u4f1a\u8bae\u8bb0\u5f55\u548c\u4ea7\u51fa\uff0c\u6211\u5c06\u5199\u4e00\u7bc7\u6587\u7ae0\u3002<\/p>\n

React Hooks \u662f\u4ec0\u4e48?<\/h1>\n

React16.8\u5f15\u5165\u4e86\u4e00\u9879\u529f\u80fd\uff0c\u4f7f\u5f97\u51fd\u6570\u7ec4\u4ef6\u80fd\u591f\u4f7f\u7528\u72b6\u6001\u7ba1\u7406\u548c\u751f\u547d\u5468\u671f\u7b49\u529f\u80fd\u3002<\/p>\n

React Hooks\u8bde\u751f\u7684\u80cc\u666f<\/h1>\n

\u5728React\u4e2d\uff0c\u6709\u4e24\u79cd\u7f16\u5199\u65b9\u5f0f\uff1a\u7c7b\u7ec4\u4ef6\u548c\u51fd\u6570\u7ec4\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u7c7b\u7ec4\u4ef6\u7f16\u5199\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u901a\u8fc7\u6309\u94ae\u6765\u5207\u6362\u6587\u672c\u5185\u5bb9\u3002<\/p>\n

import<\/span> React<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nclass<\/span> App<\/span> extends<\/span> React<\/span>.<\/span>Component<\/span> {<\/span>\r\n  constructor<\/span>(<\/span>props<\/span>)<\/span> {<\/span>\r\n    super<\/span>(<\/span>props<\/span>)<\/span>\r\n    this<\/span>.<\/span>state<\/span> =<\/span> {<\/span>\r\n      isLogin<\/span>:<\/span> true<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n\r\n  toggleLoginStatus<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    this<\/span>.<\/span>setState<\/span>({<\/span>isLogin<\/span>:<\/span> !<\/span>this<\/span>.<\/span>state<\/span>.<\/span>isLogin<\/span>});<\/span>\r\n  }<\/span>\r\n\r\n  render<\/span>()<\/span> {<\/span>\r\n    return<\/span> (<\/span>\r\n      <><\/span>\r\n        {<\/span>this<\/span>.<\/span>state<\/span>.<\/span>isLogin<\/span> ?<\/span> \"<\/span>\u30ed\u30b0\u30a4\u30f3\u4e2d<\/span>\"<\/span> :<\/span> \"<\/span>\u30ed\u30b0\u30a2\u30a6\u30c8\u4e2d<\/span>\"<\/span>}<\/span>\r\n        <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>this<\/span>.<\/span>toggleLoginStatus<\/span>}<\/span>><\/span>toggle<\/<\/span>button<\/span>><\/span>\r\n      <\/><\/span>\r\n    )<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u6309\u4e0b\u6309\u94ae\u6765\u6539\u53d8isLogin\u7684\u72b6\u6001\uff0c\u5e76\u8fdb\u884c\u6587\u672c\u7684\u5207\u6362\u3002
\n\u636e\u8bf4\u5728\u4e00\u6bb5\u65f6\u95f4\u524d\uff0c\u4f7f\u7528\u7c7b\u7ec4\u4ef6\u6765\u7f16\u5199\u4ee3\u7801\u662f\u5e38\u89c1\u7684\u505a\u6cd5\u3002
\n\u539f\u56e0\u662f\uff0c\u7c7b\u7ec4\u4ef6\u53ef\u4ee5\u4f7f\u7528\u72b6\u6001\u7ba1\u7406\u3001\u751f\u547d\u5468\u671f\u7b49\u529f\u80fd\uff0c\u800c\u51fd\u6570\u7ec4\u4ef6\u65e0\u6cd5\u4f7f\u7528\u8fd9\u4e9b\u529f\u80fd\u3002<\/p>\n
React Hooks\u7684\u51fa\u73b0\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002
\n\u6709\u4e86React Hooks\uff0c\u51fd\u6570\u7ec4\u4ef6\u53ef\u4ee5\u4f7f\u7528\u72b6\u6001\u7ba1\u7406\u548c\u751f\u547d\u5468\u671f\u529f\u80fd\uff0c\u5e76\u4e14\u53ef\u4ee5\u7f16\u5199\u5177\u6709\u9ad8\u53ef\u8bfb\u6027\u7684\u4ee3\u7801\u3002
\n\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528\u51fd\u6570\u7ec4\u4ef6\u7f16\u5199\u7684\u4e0e\u4e4b\u524d\u793a\u4f8b\u76f8\u540c\u7684\u7248\u672c\u3002<\/p>\n
import<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>isLogin<\/span>,<\/span> setIsLogin<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>true<\/span>);<\/span>\r\n\r\n  const<\/span> toggleLoginStatus<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setIsLogin<\/span>(<\/span>isLogin<\/span> =><\/span> !<\/span>isLogin<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      {<\/span>isLogin<\/span> ?<\/span> \"<\/span>\u30ed\u30b0\u30a4\u30f3\u4e2d<\/span>\"<\/span> :<\/span> \"<\/span>\u30ed\u30b0\u30a2\u30a6\u30c8\u4e2d<\/span>\"<\/span>}<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>toggleLoginStatus<\/span>}<\/span>><\/span>toggle<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u6211\u60f3\u60a8\u53ef\u80fd\u4f1a\u6ce8\u610f\u5230\uff0c\u4e0e\u7c7b\u7ec4\u4ef6\u76f8\u6bd4\uff0c\u53ef\u4ee5\u66f4\u7b80\u6d01\u5730\u7f16\u5199\u76f8\u540c\u7684\u5904\u7406\u8fc7\u7a0b\u3002<\/p>\n
\u4ecb\u7ecdReact Hooks<\/h1>\n
\u7b80\u5355\u6765\u8bf4\uff0c\u6211\u4f1a\u4ecb\u7ecd\u4e00\u4e0bReact Hooks\u3002<\/p>\n
\u4f7f\u7528\u72b6\u6001<\/h2>\n
useState\u662f\u7528\u4e8e\u4fdd\u6301\u72b6\u6001\u7684\u94a9\u5b50\uff0c\u5728React Hooks\u4e2d\u662f\u6700\u5e38\u7528\u7684\u94a9\u5b50\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u4fdd\u6301\u5404\u79cd\u4e0d\u540c\u7684\u72b6\u6001\uff0c\u4f8b\u5982\u6570\u5b57\u3001\u5e03\u5c14\u503c\u3001\u6620\u5c04\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u5f53\u6309\u94ae\u88ab\u70b9\u51fb\u65f6\u8ba1\u6570\u4f1a\u589e\u52a0\u3002<\/p>\n
import<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/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  const<\/span> countUp<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setCount<\/span>(<\/span>count<\/span> =><\/span> count<\/span> +<\/span> 1<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>p<\/span>><\/span>\u4eca\u306e\u30ab\u30a6\u30f3\u30c8\uff1a{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>countUp<\/span>}<\/span>><\/span>\r\n        count up!\r\n      <\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528\u4f7f\u7528\u6548\u679c<\/h2>\n
useEffect\u662f\u4e00\u500b\u7528\u65bc\u5be6\u73fe\u751f\u547d\u5468\u671f\uff08\u5728\u985e\u7d44\u4ef6\u4e2d\u7a31\u70bacomponentDidMount\u548ccomponentDidUpdate, componentWillUnmount\uff09\u7684\u9264\u5b50\uff0c\u5b83\u53ef\u4ee5\u5728\u6e32\u67d3\u6642\u6216\u72c0\u614b\u66f4\u65b0\u6642\u904b\u884cuseEffect\u5167\u7684\u526f\u4f5c\u7528\u51fd\u6578\u3002<\/p>\n
\u53ea\u60f3\u5728\u9996\u6b21\u6e32\u67d3\u65f6\u6267\u884c\u5904\u7406\u3002<\/h5>\n
\u5728useEffect\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e2d\u4f20\u5165\u4e00\u4e2a\u7a7a\u7684\u4f9d\u8d56\u6570\u7ec4\u3002<\/p>\n
\/\/ \u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u305f\u6642\u306b\u306e\u307f\u5b9f\u884c(componentDidMount)<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>component did mount<\/span>\"<\/span>);<\/span>\r\n  },<\/span> []);<\/span>\r\n<\/code><\/pre>\n
\u5f53\u9700\u8981\u5728\u7279\u5b9a\u7684\u72b6\u6001\u88ab\u66f4\u65b0\u65f6\u6267\u884c\u5904\u7406\u65f6<\/h5>\n
\u5728useEffect\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e2d\u6307\u5b9a\u8981\u76d1\u89c6\u7684\u72b6\u6001\u3002<\/p>\n
\/\/ count\u304c\u66f4\u65b0\u3055\u308c\u305f\u6642\u306b\u5b9f\u884c(componentDidUpdate)<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>component did update<\/span>\"<\/span>);<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>`current count is <\/span>${<\/span>count<\/span>}<\/span>`<\/span>);<\/span>\r\n  },<\/span> [<\/span>count<\/span>])<\/span>\r\n<\/code><\/pre>\n
\u5173\u4e8e\u7ec4\u4ef6\u7684\u5220\u9664\uff08\u5378\u8f7d\u65f6\uff09<\/h5>\n
\u901a\u8fc7\u5728useEffect\u4e2d\u8fd4\u56de\u51fd\u6570\uff0c\u53ef\u4ee5\u5728\u7ec4\u4ef6\u5378\u8f7d\u65f6\u5220\u9664\u6267\u884c\u7684\u526f\u4f5c\u7528\u51fd\u6570\u3002\u901a\u8fc7\u8fd9\u6837\u505a\u53ef\u4ee5\u907f\u514d\u610f\u5916\u7684\u9519\u8bef\u3002\u8fd4\u56de\u7684\u51fd\u6570\u88ab\u79f0\u4e3a\u6e05\u7406\u51fd\u6570\u3002<\/p>\n
\/\/ \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u524a\u9664\u3055\u308c\u308b\u969b\u306b\u5b9f\u884c(componentWillUnmount)<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    return<\/span> ()<\/span> =><\/span> {<\/span>\r\n      console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>component will unmount<\/span>\"<\/span>);<\/span>\r\n    };<\/span>\r\n  },<\/span> [])<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u91cc\u662f\u603b\u7ed3\u4ee5\u4e0a\u5185\u5bb9\u7684\u4e00\u4efd\u6587\u4ef6\u3002<\/p>\n
import<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/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  const<\/span> countUp<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setCount<\/span>(<\/span>count<\/span> =><\/span> count<\/span> +<\/span> 1<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>component did mount<\/span>\"<\/span>);<\/span>\r\n  },<\/span> []);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>component did update<\/span>\"<\/span>);<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>`current count is <\/span>${<\/span>count<\/span>}<\/span>`<\/span>);<\/span>\r\n  },<\/span> [<\/span>count<\/span>])<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    return<\/span> ()<\/span> =><\/span> {<\/span>\r\n      console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>component will unmount<\/span>\"<\/span>);<\/span>\r\n    };<\/span>\r\n  },<\/span> [])<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      \u4eca\u306e\u30ab\u30a6\u30f3\u30c8\uff1a{<\/span>count<\/span>}<\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>countUp<\/span>}<\/span>><\/span>\r\n        count up!\r\n      <\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528\u4e0a\u4e0b\u6587<\/h2>\n
\u6211\u60f3\u4f60\u53ef\u80fd\u4f1a\u7ecf\u5e38\u9047\u5230\u9700\u8981\u4ece\u7236\u7ec4\u4ef6\u5411\u5b50\u7ec4\u4ef6\u4f20\u9012\u503c\u7684\u60c5\u51b5\uff0c\u800c\u6709\u65f6\u4e5f\u53ef\u80fd\u9700\u8981\u5c06\u503c\u4ece\u7236\u7ec4\u4ef6\u4f20\u9012\u7ed9\u5b59\u5b50\u7ec4\u4ef6\uff0c\u5177\u4f53\u60c5\u51b5\u800c\u5b9a\u3002
\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e0d\u9700\u8981\u901a\u8fc7\u7236\u7ec4\u4ef6\u5411\u5b50\u7ec4\u4ef6\u518d\u5411\u5b59\u5b50\u7ec4\u4ef6\u4f20\u9012props\uff0c\u53ef\u4ee5\u4f7f\u7528useContext\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5728\u4efb\u4f55\u5c42\u7ea7\u4e0a\u5f15\u7528\u5b58\u50a8\u5728Context\u4e2d\u7684\u503c\u3002
\n\u867d\u7136\u8fd9\u5f88\u65b9\u4fbf\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4e00\u65e6\u66f4\u65b0\u4e86Context\uff0c\u4f7f\u7528\u8be5Context\u7684\u6240\u6709\u7ec4\u4ef6\u90fd\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002
\n\u4ee5\u4e0b\u662f\u5728\u5b59\u5b50\u7ec4\u4ef6\u4e2d\u83b7\u53d6\u5728\u7236\u7ec4\u4ef6\u4e2d\u5b9a\u4e49\u7684Context\u7684\u4ee3\u7801\u3002<\/p>\n
import<\/span> {<\/span> useContext<\/span>,<\/span> createContext<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> user<\/span> =<\/span> {<\/span>\r\n  name<\/span>:<\/span> \"<\/span>Taro<\/span>\"<\/span>,<\/span>\r\n  age<\/span>:<\/span> 17<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> UserContext<\/span> =<\/span> createContext<\/span>(<\/span>user<\/span>);<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  return<\/span> (<\/span>\r\n    <<\/span>UserContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>user<\/span>}<\/span>><\/span>\r\n      <<\/span>User<\/span> \/><\/span>\r\n    <\/<\/span>UserContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> User<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  return<\/span>(<\/span>\r\n    <<\/span>UserProfile<\/span> \/><\/span>\r\n  )<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> UserProfile<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> userInfo<\/span> =<\/span> useContext<\/span>(<\/span>UserContext<\/span>);<\/span>\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>p<\/span>><\/span>\u540d\u524d:{<\/span>userInfo<\/span>.<\/span>name<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u5e74\u9f62:{<\/span>userInfo<\/span>.<\/span>age<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528useReducer<\/h2>\n
useReducer\u8ddfuseState\u4e00\u6837\uff0c\u662f\u4e00\u4e2a\u7528\u4e8e\u7ba1\u7406\u72b6\u6001\u7684Hook\uff0c\u5728\u9700\u8981\u6839\u636e\u591a\u4e2a\u503c\u6216\u6761\u4ef6\u6765\u66f4\u65b0\u72b6\u6001\u65f6\u4e3b\u8981\u4f7f\u7528\u3002
\n\u5b83\u63a5\u6536\u4e00\u4e2a\u62e5\u6709(state, action) => newState\u7c7b\u578b\u7684reducer\u51fd\u6570\uff0c\u5e76\u8fd4\u56de\u5f53\u524d\u72b6\u6001\u548cdispatch\u65b9\u6cd5\u3002
\n\u901a\u8fc7\u5728onClick\u7b49\u4e8b\u4ef6\u4e2d\u6267\u884c\u5e26\u6709action\u4f5c\u4e3a\u53c2\u6570\u7684dispatch\u65b9\u6cd5\uff0creducer\u5c06\u88ab\u8c03\u7528\uff0c\u5e76\u6839\u636eaction\u6765\u66f4\u65b0\u72b6\u6001\u3002
\n\u7531\u4e8euseReducer\u53ea\u8fd4\u56denewState\uff0c\u6240\u4ee5\u5982\u679c\u72b6\u6001\u662f\u4ee5\u5bf9\u8c61\u5f62\u5f0f\u5b9a\u4e49\u7684\uff0c\u5fc5\u987b\u4ee5\u5bf9\u8c61\u7684\u5f62\u5f0f\u8fd4\u56de\u3002<\/p>\n
import<\/span> {<\/span> useReducer<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> reducer<\/span> =<\/span> (<\/span>state<\/span>:<\/span> any<\/span>,<\/span> action<\/span>:<\/span> any<\/span>)<\/span> =><\/span> {<\/span>\r\n  switch<\/span> (<\/span>action<\/span>)<\/span> {<\/span>\r\n    case<\/span> \"<\/span>increment<\/span>\"<\/span>:<\/span>\r\n      return<\/span> {<\/span> count<\/span>:<\/span> state<\/span>.<\/span>count<\/span> +<\/span> 1<\/span> }<\/span>\r\n    case<\/span> \"<\/span>decrement<\/span>\"<\/span>:<\/span>\r\n      return<\/span> {<\/span> count<\/span>:<\/span> state<\/span>.<\/span>count<\/span> -<\/span> 1<\/span> }<\/span>\r\n    default<\/span>:<\/span>\r\n      throw<\/span> new<\/span> Error<\/span>();<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>countState<\/span>,<\/span> dispatch<\/span>]<\/span> =<\/span> useReducer<\/span>(<\/span>reducer<\/span>,<\/span> {<\/span> count<\/span>:<\/span> 0<\/span> });<\/span>\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>p<\/span>><\/span>\u4eca\u306e\u30ab\u30a6\u30f3\u30c8:{<\/span>countState<\/span>.<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>(<\/span>\"<\/span>decrement<\/span>\"<\/span>)<\/span>}<\/span>><\/span>decrement<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>(<\/span>\"<\/span>increment<\/span>\"<\/span>)<\/span>}<\/span>><\/span>increment<\/<\/span>button<\/span>><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528useCallback<\/h2>\n
\u901a\u8fc7\u4f7f\u7528useCallback\uff0c\u53ef\u4ee5\u5c06\u51fd\u6570\u8fdb\u884c\u7f13\u5b58\uff0c\u5e76\u4ee5\u56de\u8c03\u51fd\u6570\u7684\u5f62\u5f0f\u8fd4\u56de\uff0c\u4ece\u800c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u3002useCallback\u7ecf\u5e38\u4e0eReact.memo\u4e00\u8d77\u4f7f\u7528\u3002<\/p>\n
React.memo \u662f\u4ec0\u4e48\uff1f<\/h4>\n
React.memo\u662f\u7528\u4e8e\u5305\u88c5\u5e0c\u671b\u8fdb\u884c\u8bb0\u5fc6\u5316\u7684\u7ec4\u4ef6\u7684\u51fd\u6570\u3002\u8bb0\u5fc6\u5316\u662f\u6307\u5982\u679cprops\u6ca1\u6709\u5dee\u5f02\uff0c\u5219\u8df3\u8fc7\u91cd\u65b0\u6e32\u67d3\u7684\u8fc7\u7a0b\uff0c\u5e76\u8bb0\u4f4f\u4e0a\u6b21\u6e32\u67d3\u7684\u7ec4\u4ef6\u7ed3\u679c\u3002<\/p>\n
\u7136\u800c\uff0c\u5f53\u4f5c\u4e3aprop\u63a5\u6536\u56de\u8c03\u51fd\u6570\u65f6\uff0c\u5373\u4f7f\u4f7f\u7528\u4e86React.memo\uff0c\u7ec4\u4ef6\u4ecd\u4f1a\u88ab\u91cd\u65b0\u6e32\u67d3\u3002\u8fd9\u662f\u56e0\u4e3a\u5373\u4f7f\u51fd\u6570\u5185\u5bb9\u76f8\u540c\uff0c\u6bcf\u6b21\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\u51fd\u6570\u90fd\u4f1a\u88ab\u91cd\u65b0\u521b\u5efa\uff0c\u56e0\u6b64\u5b83\u4eec\u4e0d\u4f1a\u88ab\u89c6\u4e3a\u4e0e\u4e0a\u4e00\u6b21\u76f8\u7b49\u3002<\/p>\n
\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528useCallback\u6765\u5bf9\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u4ee5\u9632\u6b62\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff0c\u6f14\u793a\u4e86\u5982\u4f55\u5728\u4f7f\u7528React.memo\u8fdb\u884c\u4e86\u8bb0\u5fc6\u5316\u7684\u7ec4\u4ef6\u4e2d\u4f20\u9012\u4f7f\u7528useCallback\u8fdb\u884c\u4e86\u8bb0\u5fc6\u5316\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u5f53\u589e\u52a0\u8ba1\u6570\uff08\u66f4\u65b0\u72b6\u6001\uff09\u65f6\uff0c\u53ea\u4f1a\u91cd\u65b0\u6e32\u67d3\u88ab\u70b9\u51fb\u7684\u7ec4\u4ef6\u3002<\/p>\n
import<\/span> {<\/span> React<\/span>.<\/span>memo<\/span>,<\/span> useCallback<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Button<\/span> =<\/span> React<\/span>.<\/span>memo<\/span>(({<\/span>text<\/span>,<\/span> handleClick<\/span>})<\/span> =><\/span> {<\/span>\r\n  \/\/ \u78ba\u8a8d\u7528<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>text<\/span>);<\/span>\r\n  return<\/span> (<\/span>\r\n    <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick<\/span>}<\/span>><\/span>{<\/span>text<\/span>}<\/span><\/<\/span>button<\/span>><\/span>\r\n  );<\/span>\r\n});<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>count1<\/span>,<\/span> setCount1<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  const<\/span> [<\/span>count2<\/span>,<\/span> setCount2<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  const<\/span> handleClick1<\/span> =<\/span> useCallback<\/span>(()<\/span> =><\/span> setCount1<\/span>(<\/span>count1<\/span> +<\/span> 1<\/span>),<\/span> [<\/span>count1<\/span>]);<\/span>\r\n  const<\/span> handleClick2<\/span> =<\/span> useCallback<\/span>(()<\/span> =><\/span> setCount2<\/span>(<\/span>count2<\/span> +<\/span> 1<\/span>),<\/span> [<\/span>count2<\/span>]);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>p<\/span>><\/span>count1:{<\/span>count1<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>count2:{<\/span>count2<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>Button<\/span> text<\/span>=<\/span>{<\/span>\"<\/span>count1:increment<\/span>\"<\/span>}<\/span> handleClick<\/span>=<\/span>{<\/span>handleClick1<\/span>}<\/span> \/><\/span>\r\n      <<\/span>Button<\/span> text<\/span>=<\/span>{<\/span>\"<\/span>count2:increment<\/span>\"<\/span>}<\/span> handleClick<\/span>=<\/span>{<\/span>handleClick2<\/span>}<\/span> \/><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528 useMemo<\/h2>\n
useMemo\u662f\u4e00\u4e2a\u7528\u4e8e\u4fdd\u5b58\u51fd\u6570\u7ed3\u679c\u7684\u94a9\u5b50\uff0c\u901a\u8fc7\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u8ba1\u7b97\uff0c\u5728\u91cd\u65b0\u6e32\u67d3\u65f6\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002
\n\u4e0a\u8ff0\u7684useCallback\u662f\u5bf9\u51fd\u6570\u672c\u8eab\u8fdb\u884c\u8bb0\u5fc6\u5316\uff0c\u800cuseMemo\u662f\u5bf9\u51fd\u6570\u7684\u7ed3\u679c\u8fdb\u884c\u8bb0\u5fc6\u5316\u3002
\n\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528useMemo\u6765\u4fdd\u5b58\u8ba1\u7b97\u7ed3\u679c\uff0c\u5e76\u5728\u4f9d\u8d56\u7684\u72b6\u6001\u66f4\u65b0\u65f6\u624d\u91cd\u65b0\u8ba1\u7b97\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n
import<\/span> {<\/span> useMemo<\/span> }<\/span> form<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>count1<\/span>,<\/span> setCount1<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  const<\/span> [<\/span>count2<\/span>,<\/span> setCount2<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  const<\/span> twiceCount1<\/span> =<\/span> useMemo<\/span>(()<\/span> =><\/span> {<\/span>\r\n    return<\/span> 2<\/span> *<\/span> count1<\/span>;<\/span>\r\n  },<\/span> [<\/span>count1<\/span>]);<\/span>\r\n\r\n  const<\/span> handleClick1<\/span> =<\/span> ()<\/span> =><\/span> setCount1<\/span>(<\/span>count1<\/span> =><\/span> count1<\/span> +<\/span> 1<\/span>);<\/span>\r\n  const<\/span> handleClick2<\/span> =<\/span> ()<\/span> =><\/span> setCount2<\/span>(<\/span>count2<\/span> =><\/span> count2<\/span> +<\/span> 1<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>p<\/span>><\/span>count1:{<\/span>count1<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>count2:{<\/span>count2<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick1<\/span>}<\/span>><\/span>count1:increment<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick2<\/span>}<\/span>><\/span>count2:increment<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>count1:{<\/span>twiceCount1<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n    <\/><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528useRef<\/h2>\n
useRef\u548cuseState\u4e00\u6837\uff0c\u53ef\u4ee5\u5728\u7ec4\u4ef6\u4e2d\u4fdd\u5b58\u503c\u3002
\n\u4e0euseState\u4e0d\u540c\u7684\u662f\uff0c\u5f53\u66f4\u65b0\u503c\u65f6\u4e0d\u4f1a\u89e6\u53d1\u91cd\u65b0\u6e32\u67d3\u3002
\n\u56e0\u6b64\uff0c\u5b83\u901a\u5e38\u7528\u4e8e\u5904\u7406\u4e0e\u6e32\u67d3\u65e0\u5173\u7684\u503c\u7684\u7528\u4f8b\u3002<\/p>\n
\u4e0b\u9762\u662f\u4f7f\u7528\u4f8b\uff0c\u5c55\u793a\u4e86\u83b7\u53d6\u4e0a\u4e00\u4e2a\u72b6\u6001\u7684\u4ee3\u7801\u3002\u203b\u8bf7\u53c2\u8003\u5b98\u65b9\u6587\u6863
\n\u5728\u7ed8\u5236\u4e4b\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528useEffect\u6765\u4fdd\u6301prevCount\u4e2d\u7684\u4e0a\u4e00\u4e2a\u72b6\u6001\uff0c\u5e76\u5728\u4e0b\u6b21\u91cd\u65b0\u7ed8\u5236\u65f6\u663e\u793aprevCount\u3002<\/p>\n
import<\/span> {<\/span> useRef<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Hoge<\/span> =<\/span> ()<\/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  const<\/span> prevCountRef<\/span> =<\/span> useRef<\/span>(<\/span>0<\/span>);<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    prevCountRef<\/span>.<\/span>current<\/span> =<\/span> count<\/span>;<\/span>\r\n  });<\/span>\r\n  const<\/span> prevCount<\/span> =<\/span> prevCountRef<\/span>.<\/span>current<\/span>;<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>p<\/span>><\/span>\u4eca\u306e\u30ab\u30a6\u30f3\u30c8:{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u524d\u56de\u306e\u30ab\u30a6\u30f3\u30c8:{<\/span>prevCount<\/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>button<\/span>><\/span>\r\n    <\/><\/span>\r\n  )<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> Hoge<\/span>\r\n<\/code><\/pre>\n
\u603b\u4e4b<\/h2>\n
\u6211\u7b80\u5355\u5730\u4ecb\u7ecd\u4e86React Hooks\u7684\u8d77\u6e90\u548c\u5b98\u65b9Hooks\u3002
\n\u6211\u81ea\u5df1\u5e76\u6ca1\u6709\u5f88\u597d\u5730\u4f7f\u7528useCallback\u3001useMemo\u548cReact.memo\u8fd9\u4e9b\u6982\u5ff5\uff0c\u901a\u8fc7\u8fd9\u6b21\u8bb0\u5f55\u6211\u91cd\u65b0\u786e\u8ba4\u4e86\u8fd9\u4e9b\u57fa\u672c\u6982\u5ff5\u3002
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\u9996\u5148 \u7531\u4e8e\u5728\u516c\u53f8\u5185\u8fdb\u884c\u4e86React Hooks\u5b66\u4e60\u4f1a\uff0c\u4f5c\u4e3a\u4f1a\u8bae\u8bb0\u5f55\u548c\u4ea7\u51fa\uff0c\u6211\u5c06\u5199\u4e00\u7bc7\u6587\u7ae0\u3002 React Hoo […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38718","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nReact Hooks\u662f\u4ec0\u4e48\uff1f - 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\u662f\u4ec0\u4e48\uff1f-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React Hooks\u662f\u4ec0\u4e48\uff1f\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u7531\u4e8e\u5728\u516c\u53f8\u5185\u8fdb\u884c\u4e86React Hooks\u5b66\u4e60\u4f1a\uff0c\u4f5c\u4e3a\u4f1a\u8bae\u8bb0\u5f55\u548c\u4ea7\u51fa\uff0c\u6211\u5c06\u5199\u4e00\u7bc7\u6587\u7ae0\u3002 React Hoo […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/react-hooks\u662f\u4ec0\u4e48\uff1f-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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