{"id":38158,"date":"2023-09-20T20:01:04","date_gmt":"2023-08-21T20:29:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91usestate%e5%92%8cuseeffect\/"},"modified":"2024-05-04T00:45:03","modified_gmt":"2024-05-03T16:45:03","slug":"%e3%80%90react%e3%80%91usestate%e5%92%8cuseeffect","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91usestate%e5%92%8cuseeffect\/","title":{"rendered":"\u3010React\u3011useState\u548cuseEffect"},"content":{"rendered":"

React Hooks\u7684\u4f7f\u7528\u65b9\u6cd5\uff1auseState\u548cuseEffect<\/h1>\n

React Hooks\u662f\u5728React 16.8\u5f15\u5165\u7684\uff0c\u5b83\u5141\u8bb8\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u72b6\u6001\u548c\u751f\u547d\u5468\u671f\u65b9\u6cd5\u3002useState\u7528\u4e8e\u7ba1\u7406\u72b6\u6001\uff0cuseEffect\u7528\u4f5c\u751f\u547d\u5468\u671f\u65b9\u6cd5\u7684\u66ff\u4ee3\u3002\u4e0b\u9762\u5c06\u4ecb\u7ecd\u5b83\u4eec\u7684\u57fa\u672c\u7528\u6cd5\u3002<\/p>\n

1. \u4f7f\u7528 useState \u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n

\u4f7f\u7528useState\u53ef\u4ee5\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\u7ba1\u7406\u72b6\u6001\u3002\u5b83\u8fd4\u56de\u72b6\u6001\u53d8\u91cf\u53ca\u5176\u66f4\u65b0\u51fd\u6570\uff0c\u5e76\u4e14\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u4f1a\u7531\u8fd9\u4e9b\u53d8\u91cf\u89e6\u53d1\u3002<\/p>\n

import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> Counter<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  \/\/ \u521d\u671f\u72b6\u614b\u3068\u66f4\u65b0\u95a2\u6570\u3092\u53d6\u5f97<\/span>\r\n  const<\/span> [<\/span>count<\/span>,<\/span> setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  \/\/ const [count, setCount] = useState<number>(0); \/\/ typescript\u306e\u3068\u304d<\/span>\r\n\r\n  const<\/span> increment<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    \/\/ \u72b6\u614b\u306e\u66f4\u65b0<\/span>\r\n    setCount<\/span>(<\/span>count<\/span> +<\/span> 1<\/span>);<\/span>\r\n  };<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Count: {<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>increment<\/span>}<\/span>><\/span>Increment<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> Counter<\/span>;<\/span>\r\n<\/code><\/pre>\n
useState\u63a5\u53d7\u72b6\u6001\u7684\u521d\u59cb\u503c\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u7528\u4e8e\u66f4\u65b0\u5f53\u524d\u72b6\u6001\u53ca\u5176\u72b6\u6001\u7684\u51fd\u6570\u3002<\/p>\n
2. useEffect\u7684\u57fa\u672c\u4f7f\u7528\u65b9\u6cd5<\/h2>\n
useEffect \u5728\u7ec4\u4ef6\u6302\u8f7d\u3001\u66f4\u65b0\u6216\u5378\u8f7d\u65f6\u88ab\u7528\u6765\u6267\u884c\u526f\u4f5c\u7528\u7684\u4ee3\u7801\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\nconst<\/span> Timer<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>seconds<\/span>,<\/span> setSeconds<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n  \/\/ useEffect\u3092\u4f7f\u7528\u3057\u3066\u30ab\u30a6\u30f3\u30bf\u30fc\u304c\u66f4\u65b0\u3055\u308c\u308b\u305f\u3073\u306b\u51e6\u7406\u3092\u5b9f\u884c<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    \/\/ 1\u79d2\u3054\u3068\u306b\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u3059\u308b\u51e6\u7406<\/span>\r\n    const<\/span> intervalId<\/span> =<\/span> setInterval<\/span>(()<\/span> =><\/span> {<\/span>\r\n      setSeconds<\/span>(<\/span>prevSeconds<\/span> =><\/span> prevSeconds<\/span> +<\/span> 1<\/span>);<\/span>\r\n    },<\/span> 1000<\/span>);<\/span> \/\/ 1000ms\u306e\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb<\/span>\r\n\r\n    \/\/ \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30a2\u30f3\u30de\u30a6\u30f3\u30c8\u3055\u308c\u305f\u3068\u304d\u306b\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7<\/span>\r\n    return <\/span>()<\/span> =><\/span> clearInterval<\/span>(<\/span>intervalId<\/span>);<\/span>\r\n  },<\/span> []);<\/span> \/\/ \u4f9d\u5b58\u914d\u5217\u304c\u7a7a\u306a\u306e\u3067\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30de\u30a6\u30f3\u30c8\u3055\u308c\u305f\u3068\u304d\u306b1\u5ea6\u3060\u3051\u5b9f\u884c<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Elapsed Time: {<\/span>seconds<\/span>}<\/span> seconds<\/<\/span>p<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> Timer<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u5c06\u4f9d\u8d56\u6570\u7ec4\u4f5c\u4e3auseEffect\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u9012\uff0c\u60a8\u53ef\u4ee5\u63a7\u5236\u53ea\u6709\u5728\u4f9d\u8d56\u9879\u66f4\u6539\u65f6\u624d\u6267\u884cuseEffect\u3002\u5982\u679c\u4f20\u9012\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4\uff0c\u5219\u53ea\u4f1a\u5728\u6302\u8f7d\u65f6\u6267\u884c\u4e00\u6b21\u3002<\/p>\n
\u5f53\u6570\u7ec4\u4e0d\u4e3a\u7a7a\u65f6\u7684\u793a\u4f8b<\/p>\n
import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> ExampleComponent<\/span> =<\/span> ({<\/span> initialCount<\/span> })<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>count<\/span>,<\/span> setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>initialCount<\/span>);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    \/\/ count\u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u305f\u3068\u304d\u306b\u5b9f\u884c<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>`Count is <\/span>${<\/span>count<\/span>}<\/span>`<\/span>);<\/span>\r\n  },<\/span> [<\/span>count<\/span>]);<\/span> \/\/ count\u304c\u5909\u66f4\u3055\u308c\u305f\u3068\u304d\u306e\u307f\u5b9f\u884c<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Count: {<\/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>Increment<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> ExampleComponent<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u901a\u904e\u9019\u6a23\u7684\u5b78\u7fd2\uff0c\u4f60\u73fe\u5728\u5c0d\u65bcuseState\u548cuseEffect\u7684\u57fa\u672c\u4f7f\u7528\u65b9\u5f0f\u6709\u4e86\u5145\u5206\u7684\u7406\u89e3\u3002\u9019\u4e9bHooks\u662fReact\u7d44\u4ef6\u66f4\u7c21\u6f54\u548c\u9ad8\u6548\u69cb\u5efa\u7684\u5f37\u5927\u5de5\u5177\u3002<\/p>\n
\u8fd9\u7bc7\u6587\u7ae0\u662f\u4e3a\u4e86\u8ba9\u521d\u5b66\u8005\u5927\u5b66\u751f\u7406\u89e3React Next\u800c\u51c6\u5907\u7684\u8f93\u51fa\u8d44\u6599\u3002
\n\u6b22\u8fce\u5927\u5bb6\u63d0\u51fa\u9519\u8bef\u3001\u610f\u89c1\u7b49\u8bc4\u8bba\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
React Hooks\u7684\u4f7f\u7528\u65b9\u6cd5\uff1auseState\u548cuseEffect React Hooks\u662f\u5728React  […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38158","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u3010React\u3011useState\u548cuseEffect - 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\/\u3010react\u3011usestate\u548cuseeffect\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010React\u3011useState\u548cuseEffect\" \/>\n<meta property=\"og:description\" content=\"React Hooks\u7684\u4f7f\u7528\u65b9\u6cd5\uff1auseState\u548cuseEffect React Hooks\u662f\u5728React […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011usestate\u548cuseeffect\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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