{"id":38548,"date":"2022-12-20T22:55:52","date_gmt":"2023-09-21T06:18:37","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0react-hooks%ef%bc%88%e4%b8%8a%e5%8d%8a%e9%83%a8%e5%88%86%ef%bc%89%e3%80%90%e9%80%82%e5%90%88%e5%88%9d%e5%ad%a6%e8%80%85%e3%80%91\/"},"modified":"2024-04-29T06:14:14","modified_gmt":"2024-04-28T22:14:14","slug":"%e3%80%90react%e3%80%91%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0react-hooks%ef%bc%88%e4%b8%8a%e5%8d%8a%e9%83%a8%e5%88%86%ef%bc%89%e3%80%90%e9%80%82%e5%90%88%e5%88%9d%e5%ad%a6%e8%80%85%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0react-hooks%ef%bc%88%e4%b8%8a%e5%8d%8a%e9%83%a8%e5%88%86%ef%bc%89%e3%80%90%e9%80%82%e5%90%88%e5%88%9d%e5%ad%a6%e8%80%85%e3%80%91\/","title":{"rendered":"\u3010React\u3011\u5f00\u59cb\u5b66\u4e60React Hooks\uff08\u4e0a\u534a\u90e8\u5206\uff09\u3010\u9002\u5408\u521d\u5b66\u8005\u3011"},"content":{"rendered":"

React Hooks\u662f\u4ec0\u4e48\uff1f<\/h2>\n

React Hooks\u7684hook\u662f\u6307\u4ece2019\u5e742\u6708\u53d1\u5e03\u7684React 16.8\u5f00\u59cb\u65b0\u589e\u7684\u4e00\u79cd\u529f\u80fd\uff0c\u53ef\u4ee5\u5728\u4e0d\u7f16\u5199\u7c7b\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528React\u7684\u529f\u80fd\uff0c\u4f8b\u5982state\u7b49\u3002<\/p>\n

\u4f5c\u4e3a\u4f18\u52bf\uff0c\u51fd\u6570\u7ec4\u4ef6\u53ef\u4ee5\u62e5\u6709\u72b6\u6001\u5e76\u6839\u636e\u751f\u547d\u5468\u671f\u9002\u65f6\u5b9e\u73b0\u5904\u7406\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u4ee3\u7801\u66f4\u7b80\u6d01\uff0c\u4e5f\u80fd\u964d\u4f4eReact\u7684\u5b66\u4e60\u6210\u672c\u3002?<\/p>\n

\u8ba9\u6211\u4eec\u8bd5\u7740\u4f7f\u7528React Hooks\u3002<\/h2>\n

\u73af\u5883\u6784\u5efa<\/h3>\n

\u8fd9\u6b21\u4e3a\u4e86\u8282\u7701\u65f6\u95f4\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4e00\u4e2a\u540d\u4e3aVite\u7684\u6784\u5efa\u5de5\u5177\u3002
\nVite\u662f\u7531Vue.js\u7684\u5f00\u53d1\u8005Evan You\u4e3b\u5bfc\u5f00\u53d1\u7684\u524d\u7aef\u6784\u5efa\u5de5\u5177\u3002
\n\u5982\u679c\u60a8\u60f3\u4e86\u89e3\u66f4\u591a\u8be6\u60c5\uff0c\u8bf7\u53c2\u9605\u4e0b\u65b9\u5185\u5bb9\u3002<\/p>\n

 <\/p>\n

$<\/span> npx create vite@latest\r\n? Project name:react-hooks-introduction\r\n? Select a freamwork:react\r\n? Select a variand:javascript\r\n<\/span><\/code><\/pre>\n
\u60a8\u53ef\u4ee5\u4f7f\u7528\u6b64\u6765\u521b\u5efa\u6846\u67b6\u3002
\n\u4e4b\u540e\uff0c\u8bf7\u521b\u5efa\u6846\u67b6\u5e76\u5c06\u5176\u79fb\u52a8\u5230\u76ee\u5f55\u4e2d\u8fdb\u884c\u8bbe\u7f6e\u548c\u542f\u52a8\u670d\u52a1\u5668\u3002
\n\u4ee5\u4e0b\u662f\u547d\u4ee4\u5217\u8868\u3002<\/p>\n
$<\/span> cd <\/span>react-hooks-introduction \r\n$<\/span> npm i\r\n$<\/span> npm run dev #vite\u306e\u5834\u5408\u306fstart\u3067\u306f\u306a\u304fdev\u306a\u306e\u3067\u6ce8\u610f<\/span>\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u8bf7\u6253\u5f00 src\/App.jsc \u6587\u4ef6\u3002
\n\u5f53\u4f7f\u7528\u6784\u5efa\u5de5\u5177\u542f\u52a8\u65f6\uff0c\u4f1a\u5bfc\u5165 useState\uff0c\u4f46\u8bf7\u5220\u9664\u5b83\u4eec\u5e76\u5c06\u5176\u4fee\u6539\u4e3a\u4ee5\u4e0b\u72b6\u6001\u3002<\/p>\n
\r\nimport<\/span> '<\/span>.\/App.css<\/span>'<\/span>\r\n\r\nfunction<\/span> App<\/span>()<\/span> {<\/span>\r\n  return<\/span> <<\/span>div<\/span> className<\/span>=<\/span>'App'<\/span>><\/<\/span>div<\/span>><\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> App<\/span>\r\n<\/code><\/pre>\n
\u73b0\u5728\u6211\u4eec\u6309\u987a\u5e8f\u6765\u5b66\u4e60\u5427\uff01<\/p>\n
\u4f7f\u7528\u72b6\u6001<\/h3>\n
useState\u662f\u4e00\u4e2a\u7528\u4e8e\u4fdd\u5b58\u548c\u66f4\u65b0\u51fd\u6570\u7ec4\u4ef6\u72b6\u6001\u7684\u94a9\u5b50\u3002<\/p>\n
import<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>\r\nimport<\/span> '<\/span>.\/App.css<\/span>'<\/span>\r\n\r\nfunction<\/span> App<\/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> handleClick<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setCount<\/span>(<\/span>prev<\/span> =><\/span> prev<\/span> +<\/span> 1<\/span>)<\/span>\r\n  }<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n  <><\/span>\r\n    <<\/span>h1<\/span>><\/span>useState<\/<\/span>h1<\/span>><\/span>\r\n    <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick<\/span>}<\/span>><\/span>count is {<\/span>count<\/span>}<\/span><\/<\/span>button<\/span>><\/span>\r\n  <\/><\/span>\r\n  )<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> App<\/span>\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u6211\u7a0d\u5fae\u89e3\u91ca\u4e00\u4e0b\u4ee3\u7801\u3002<\/p>\n
 const<\/span> [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>)<\/span> \r\n<\/code><\/pre>\n
\u8fd9\u91cc\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5f53\u524d\u503c\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u8fd4\u56de\u66f4\u65b0\u51fd\u6570\u7684\u51fd\u6570\u3002
\ncount\u5c06\u4ee5useState\u7684\u53c2\u6570\u4f5c\u4e3a\u521d\u59cb\u503c\u50a8\u5b58\u3002<\/p>\n
\u6b64\u5916\uff0c\u5982\u679c\u60a8\u5bf9\u6240\u8c13\u7684\u5206\u5272\u8d4b\u503c\u4e00\u8bcd\u4e0d\u719f\u6089\uff0c\u53ef\u4ee5\u53c2\u8003\u4ee5\u4e0b\u5185\u5bb9\uff0c\u56e0\u4e3a\u6211\u4eec\u4f7f\u7528\u4e86\u5206\u5272\u8d4b\u503c\u3002<\/p>\n
 <\/p>\n
  const<\/span> handleClick<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setCount<\/span>(<\/span>prev<\/span> =><\/span> prev<\/span> +<\/span> 1<\/span>)<\/span>\r\n  }<\/span>\r\n<\/code><\/pre>\n
\u5f53\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u4e0a\u8ff0\u7684\u66f4\u65b0\u51fd\u6570\u5c06\u88ab\u6267\u884c\u5e76\u66f4\u65b0\u6570\u503c\u3002<\/p>\n
\u53e6\u5916\uff0c\u8fd9\u4e2a\u65f6\u5019<\/p>\n
    <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick<\/span>}<\/span>><\/span>count is {<\/span>count<\/span>}<\/span><\/<\/span>button<\/span>><\/span>\r\n<\/code><\/pre>\n
\u4e0d\u662f<\/p>\n
    <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick<\/span>()<\/span>}<\/span>><\/span>count is {<\/span>count<\/span>}<\/span><\/<\/span>button<\/span>><\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u60a8\u5199\u6210\u8fd9\u6837\uff0c\u5f53\u6e32\u67d3\u65f6\u4f1a\u89e6\u53d1handleClick\uff0c\u6240\u4ee5\u8bf7\u6ce8\u610f\uff01<\/p>\n
\u4f7f\u7528useEffect<\/h3>\n
useEffect\u662f\u4e00\u4e2a\u53ef\u4ee5\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\u63a7\u5236\u526f\u4f5c\u7528\u7684\u94a9\u5b50\u3002<\/p>\n
import<\/span> {<\/span> useEffect<\/span>,<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>\r\nimport<\/span> '<\/span>.\/App.css<\/span>'<\/span>\r\n\r\nfunction<\/span> App<\/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> handleClick<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setCount<\/span>(<\/span>prev<\/span> =><\/span> prev<\/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>Hello useEffect<\/span>'<\/span>)<\/span>\r\n  },[<\/span>count<\/span>])<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n  <><\/span>\r\n    <<\/span>h1<\/span>><\/span>useState,UseEffect<\/<\/span>h1<\/span>><\/span>\r\n    <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick<\/span>}<\/span>><\/span>count is {<\/span>count<\/span>}<\/span><\/<\/span>button<\/span>><\/span>\r\n  <\/><\/span>\r\n  )<\/span>\r\n}<\/span>\r\nexport<\/span> default<\/span> App<\/span>\r\n<\/code><\/pre>\n
\u6211\u4f1a\u505a\u5fc5\u8981\u7684\u8865\u5145\u3002<\/p>\n
  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>Hello useEffect<\/span>'<\/span>)<\/span>\r\n  },[<\/span>count<\/span>])<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u5728\u7b2c1\u4e2a\u53c2\u6570\u4e2d\u5199\u4e0b\u8981\u6267\u884c\u7684\u526f\u4f5c\u7528\u51fd\u6570\uff0c\u5e76\u5728\u7b2c2\u4e2a\u53c2\u6570\u4e2d\u5199\u4e0b\u63a7\u5236\u526f\u4f5c\u7528\u51fd\u6570\u6267\u884c\u65f6\u673a\u7684\u4f9d\u8d56\u6570\u636e\u3002<\/p>\n
\u6839\u636e\u8fd9\u6b21\u6765\u8bf4\uff0c\u7531\u4e8e`count`\u662f\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u6240\u4ee5\u6bcf\u6b21\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u4f1a\u5728\u63a7\u5236\u53f0\u6253\u5370`Hello useEffect`\u3002<\/p>\n
\u4f7f\u7528\u4e0a\u4e0b\u6587<\/h3>\n
useContext\u662f\u4e00\u4e2a\u80fd\u591f\u7ba1\u7406\u591a\u4e2a\u7ec4\u4ef6\u4e4b\u95f4\u5171\u4eab\u6570\u636e\u7684\u94a9\u5b50\u3002\u901a\u8fc7\u4f7f\u7528\u5b83\uff0c\u6211\u4eec\u4e0d\u518d\u9700\u8981\u901a\u8fc7props\u7684\u65b9\u5f0f\u8fdb\u884c\u6570\u636e\u4f20\u9012\uff0c\u800c\u53ef\u4ee5\u5728\u5168\u5c40\u8303\u56f4\u5185\u8fdb\u884c\u7ba1\u7406\uff0c\u4f7f\u6570\u636e\u7684\u7ba1\u7406\u53d8\u5f97\u66f4\u52a0\u6e05\u6670\u6613\u61c2\u3002<\/p>\n
\u6570\u636e\u7ba1\u7406\u7684\u6587\u4ef6\u53ef\u4ee5\u5728App.jsx\u4e2d\u5b9e\u73b0\uff0c\u4f46\u8fd9\u6b21\u6211\u4eec\u5c06\u5b58\u50a8\u5728main.jsx\u4e2d\u3002<\/p>\n
import<\/span> React<\/span>,<\/span> {<\/span> createContext<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>\r\nimport<\/span> ReactDOM<\/span> from<\/span> '<\/span>react-dom\/client<\/span>'<\/span>\r\nimport<\/span> App<\/span> from<\/span> '<\/span>.\/App.jsx<\/span>'<\/span>\r\nimport<\/span> '<\/span>.\/index.css<\/span>'<\/span>\r\n\r\nconst<\/span> comicInfo<\/span> =<\/span> {<\/span>\r\n  title<\/span>:<\/span> '<\/span>\u546a\u8853\u5efb\u6226<\/span>'<\/span>,<\/span>\r\n  author<\/span>:<\/span> '<\/span>\u82a5\u898b\u4e0b\u3005<\/span>'<\/span>,<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u7ba1\u7406\u3057\u305f\u3044context\u3092\u751f\u6210\u3059\u308b<\/span>\r\nconst<\/span> ComicContext<\/span> =<\/span> createContext<\/span>(<\/span>comicInfo<\/span>)<\/span>\r\n\r\nReactDOM<\/span>.<\/span>createRoot<\/span>(<\/span>document<\/span>.<\/span>getElementById<\/span>(<\/span>'<\/span>root<\/span>'<\/span>)).<\/span>render<\/span>(<\/span>\r\n  \/\/ value\u306b\u5171\u6709\u3057\u305f\u3044\u30c7\u30fc\u30bf\u3082\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u3067\u6ce8\u610f<\/span>\r\n  <<\/span>ComicContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>comicInfo<\/span>}<\/span>><\/span>\r\n    <<\/span>React<\/span>.<\/span>StrictMode<\/span>><\/span>\r\n      <<\/span>App<\/span> \/><\/span>\r\n    <\/<\/span>React<\/span>.<\/span>StrictMode<\/span>><\/span>,\r\n  <\/<\/span>ComicContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n)<\/span>\r\n\r\nexport<\/span> default<\/span> ComicContext<\/span>\r\n<\/code><\/pre>\n
\u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u5b9e\u9645\u52a8\u624b\u4f7f\u7528\u5b83\u5427\uff01<\/p>\n
import<\/span> {<\/span> useContext<\/span>,<\/span> useEffect<\/span>,<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>\r\nimport<\/span> '<\/span>.\/App.css<\/span>'<\/span>\r\nimport<\/span> ComicContext<\/span> from<\/span> '<\/span>.\/main<\/span>'<\/span>\r\n\r\nfunction<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> [<\/span>count<\/span>,<\/span>setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>)<\/span>\r\n  const<\/span> comicInfo<\/span> =<\/span> useContext<\/span>(<\/span>ComicContext<\/span>)<\/span>\r\n\r\n  const<\/span> handleClick<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setCount<\/span>(<\/span>prev<\/span> =><\/span> prev<\/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>Hello useEffect<\/span>'<\/span>)<\/span>\r\n  },[<\/span>count<\/span>])<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n  <><\/span>\r\n    <<\/span>h1<\/span>><\/span>useState,UseEffect<\/<\/span>h1<\/span>><\/span>\r\n    <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleClick<\/span>}<\/span>><\/span>count is {<\/span>count<\/span>}<\/span><\/<\/span>button<\/span>><\/span>\r\n    <<\/span>hr<\/span>\/><\/span>\r\n    <<\/span>h1<\/span>><\/span>useContext<\/<\/span>h1<\/span>><\/span>\r\n    <<\/span>p<\/span>><\/span>{<\/span>comicInfo<\/span>.<\/span>title<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n    <<\/span>p<\/span>><\/span>{<\/span>comicInfo<\/span>.<\/span>author<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n  <\/><\/span>\r\n  )<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> App<\/span>\r\n<\/code><\/pre>\n
 const comicInfo = useContext(ComicContext)\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
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