{"id":38497,"date":"2023-12-11T22:46:17","date_gmt":"2022-12-18T13:09:59","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e%e4%bd%bf%e7%94%a8useeffect%e7%9a%84%e4%be%9d%e8%b5%96%e6%95%b0%e7%bb%84%e7%9a%84%e9%80%89%e6%8b%a9\/"},"modified":"2024-05-04T13:09:19","modified_gmt":"2024-05-04T05:09:19","slug":"%e5%85%b3%e4%ba%8e%e4%bd%bf%e7%94%a8useeffect%e7%9a%84%e4%be%9d%e8%b5%96%e6%95%b0%e7%bb%84%e7%9a%84%e9%80%89%e6%8b%a9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e%e4%bd%bf%e7%94%a8useeffect%e7%9a%84%e4%be%9d%e8%b5%96%e6%95%b0%e7%bb%84%e7%9a%84%e9%80%89%e6%8b%a9\/","title":{"rendered":"\u5173\u4e8e\u4f7f\u7528`useEffect`\u7684\u4f9d\u8d56\u6570\u7ec4\u7684\u9009\u62e9"},"content":{"rendered":"

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\"<\/span>use client<\/span>\"<\/span>;<\/span>\r\nimport<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> Example<\/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  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    document<\/span>.<\/span>title<\/span> =<\/span> `You clicked <\/span>${<\/span>count<\/span>}<\/span> times`<\/span>;<\/span>\r\n  });<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>You<\/span> clicked<\/span> {<\/span>count<\/span>}<\/span> times<\/span><<\/span>\/p<\/span>>\r\n<\/span>      <<\/span>button<\/span> onClick<\/span>=<\/span>{()<\/span> =><\/span> setCount<\/span>(<\/span>count<\/span> +<\/span> 1<\/span>)}<\/span>><\/span>\r\n        Click<\/span> me<\/span>\r\n      <<\/span>\/button<\/span>>\r\n<\/span>    <<\/span>\/div<\/span>>\r\n<\/span>  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
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\"<\/span>use client<\/span>\"<\/span>;<\/span>\r\nimport<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> Example<\/span>()<\/span> {<\/span>\r\n  const<\/span> [<\/span>count<\/span>,<\/span> setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    document<\/span>.<\/span>title<\/span> =<\/span> `You clicked <\/span>${<\/span>count<\/span>}<\/span> times`<\/span>;<\/span>\r\n  },<\/span> [<\/span>count<\/span>]);<\/span> \/\/ \u3053\u306e\u884c\u306b\u6ce8\u76ee<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>You<\/span> clicked<\/span> {<\/span>count<\/span>}<\/span> times<\/span><<\/span>\/p<\/span>>\r\n<\/span>      <<\/span>button<\/span> onClick<\/span>=<\/span>{()<\/span> =><\/span> setCount<\/span>(<\/span>count<\/span> +<\/span> 1<\/span>)}<\/span>><\/span>\r\n        Click<\/span> me<\/span>\r\n      <<\/span>\/button<\/span>>\r\n<\/span>    <<\/span>\/div<\/span>>\r\n<\/span>  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
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\"<\/span>use client<\/span>\"<\/span>;<\/span>\r\nimport<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> Example<\/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    fetch<\/span>(<\/span>'<\/span>\/api\/data<\/span>'<\/span>)<\/span>\r\n      .<\/span>then<\/span>(<\/span>response<\/span> =><\/span> response<\/span>.<\/span>json<\/span>())<\/span>\r\n      .<\/span>then<\/span>(<\/span>data<\/span> =><\/span> setData<\/span>(<\/span>data<\/span>));<\/span>\r\n  },<\/span> []);<\/span> \/\/ \u3053\u306e\u884c\u306b\u6ce8\u76ee<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      {<\/span>data<\/span> ?<\/span> `Fetched data: <\/span>${<\/span>data<\/span>}<\/span>`<\/span> :<\/span> '<\/span>Fetching data...<\/span>'<\/span>}<\/span>\r\n    <<\/span>\/div<\/span>>\r\n<\/span>  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
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\u603b\u7ed3<\/h2>\n
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