{"id":38499,"date":"2023-09-25T22:30:04","date_gmt":"2023-07-21T09:02:55","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react%e7%9a%84%e8%af%ad%e6%b3%95%e5%92%8cusestate%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e5%a4%87%e5%bf%98%e5%bd%95\/"},"modified":"2024-05-04T01:34:04","modified_gmt":"2024-05-03T17:34:04","slug":"react%e7%9a%84%e8%af%ad%e6%b3%95%e5%92%8cusestate%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e5%a4%87%e5%bf%98%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react%e7%9a%84%e8%af%ad%e6%b3%95%e5%92%8cusestate%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e5%a4%87%e5%bf%98%e5%bd%95\/","title":{"rendered":"React\u7684\u8bed\u6cd5\u548cuseState\u7684\u4f7f\u7528\u65b9\u6cd5\u5907\u5fd8\u5f55"},"content":{"rendered":"

\u9996\u5148<\/h2>\n

\u8fd9\u662f\u5173\u4e8eReact useState\u7684\u5907\u5fd8\u5f55?
\n\u6211\u662f\u521d\u5b66\u8005?
\n\u6211\u8ba4\u4e3a\u53ef\u80fd\u4f1a\u6709\u5f88\u591a\u9519\u8bef\u7684\u5730\u65b9\u3002
\n\u5982\u679c\u4f60\u53d1\u73b0\u4e86\uff0c\u8bf7\u6307\u51fa\u6765\uff0c\u6211\u4f1a\u975e\u5e38\u611f\u6fc0?<\/p>\n

\u5185\u5bb9<\/h2>\n

\u4e3a\u4e86\u5728\u4ee5\u540e\u56de\u987e\u65f6\u80fd\u591f\u81ea\u5df1\u6574\u7406React\u7684useState\u90e8\u5206\uff0c\u6211\u5c06\u5176\u8bb0\u5f55\u4e0b\u6765\u3002<\/p>\n

\u4e3a\u4e86\u7406\u89e3\u8fd9\u4e2a\u8bed\u6cd5\uff0c\u6211\u5c06\u5176\u6bd4\u55bb\u4e3a\u5bb6\u91cc\u7684\u7535\u706f\u5f00\u5173\u3002<\/p>\n

React\u8bed\u6cd5<\/h2>\n

\u57fa\u672c\u4e0a\u662f\u300c\u58f0\u660e\u300d\u2192\u300c\u51fd\u6570\u7ec4\u4ef6\u300d\u2192\u300cjsx\u300d\u2192\u300c\u8f93\u51fa\u300d\u3002<\/p>\n

\u6309\u7167\u8fd9\u4e2a\u6d41\u7a0b\u5199\u4e0b\u6765\u3002<\/p>\n

import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> SwitchComponent<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  \/\/ \u30b9\u30a4\u30c3\u30c1\u306e\u72b6\u614b\u3092 'MIN', '\u771f\u3093\u4e2d', 'MAX' \u306e\u3044\u305a\u308c\u304b\u3067\u7ba1\u7406<\/span>\r\n  const<\/span> [<\/span>status<\/span>,<\/span> setStatus<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>'<\/span>MIN<\/span>'<\/span>);<\/span>\r\n\r\n  const<\/span> toggleStatus<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    \/\/ \u73fe\u5728\u306estatus\u306b\u57fa\u3065\u3044\u3066\u6b21\u306e\u72b6\u614b\u3092\u6c7a\u5b9a<\/span>\r\n    switch <\/span>(<\/span>status<\/span>)<\/span> {<\/span>\r\n      case<\/span> '<\/span>MIN<\/span>'<\/span>:<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>\u771f\u3093\u4e2d<\/span>'<\/span>);<\/span>\r\n        break<\/span>;<\/span>\r\n      case<\/span> '<\/span>\u771f\u3093\u4e2d<\/span>'<\/span>:<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>MAX<\/span>'<\/span>);<\/span>\r\n        break<\/span>;<\/span>\r\n      case<\/span> '<\/span>MAX<\/span>'<\/span>:<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>MIN<\/span>'<\/span>);<\/span>\r\n        break<\/span>;<\/span>\r\n      default<\/span>:<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>MIN<\/span>'<\/span>);<\/span>\r\n    }<\/span>\r\n  };<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u73fe\u5728\u306e\u30b9\u30c6\u30fc\u30bf\u30b9: {<\/span>status<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>toggleStatus<\/span>}<\/span>><\/span>Toggle Status<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> SwitchComponent<\/span>;<\/span>\r\n\r\n<\/code><\/pre>\n
\u4ee5\u8fd9\u6bb5\u4ee3\u7801\u4f5c\u4e3a\u4f8b\u5b50\uff0c\u5c06\u5176\u6309\u7167\u4e0d\u540c\u7684\u90e8\u5206\u8fdb\u884c\u603b\u7ed3\u3002<\/p>\n
\u58f0\u660e<\/h3>\n
import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u90e8\u5206\u5bf9\u5e94\u4e8e\u5b83\u3002
\n\u5bfc\u5165\u6574\u4e2aReact\u5e93\u3002
\n\u4f7f\u7528{ useState }\u5bfc\u5165useState hook\u3002<\/p>\n
usestate \u662f\u4e3a\u4e86\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\u4f7f\u7528”\u72b6\u6001\uff08state\uff09”\u800c\u5fc5\u9700\u7684
\n\u901a\u8fc7\u4f7f\u7528”\u94a9\u5b50\uff08hook\uff09”\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u7ec4\u4ef6\u5185\u5904\u7406”\u72b6\u6001”\u3002<\/div>\n
\u5728\u4ee5\u4e0b\u60c5\u5883\u4e2d\u4f7f\u7528useState<\/p>\n
    \n
  • \n
      \u30dc\u30bf\u30f3\u3092\u62bc\u3057\u3066\u8868\u793a\u3092\u5207\u308a\u66ff\u3048\u308b<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          \u30ab\u30fc\u30bd\u30eb\u3084\u30af\u30ea\u30c3\u30af\u3059\u308b\u3053\u3068\u3067\u52d5\u304d\u3092\u3064\u3051\u308b<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \u306a\u3069\u3053\u308c\u3089\u304c\u3042\u3063\u305f\u969b\u306b\u4f7f\u3046\u3002<\/ul>\n
            \u51fd\u6570\u7ec4\u4ef6<\/h3>\n
            \u6709\u4e24\u79cd\u7c7b\u578b\u5206\u522b\u4e3a\u300c\u7bad\u5934\u51fd\u6570\u578b\u300d\u548c\u300c\u51fd\u6570\u578b\u300d\u3002
            \n\u867d\u7136\u5b83\u4eec\u53ea\u6709\u4e00\u70b9\u70b9\u4e0d\u540c\uff0c\u4f46\u53ef\u4ee5\u6839\u636e\u4e2a\u4eba\u559c\u597d\u9009\u62e9\u4f7f\u7528\u3002<\/p>\n
            \u7bad\u5934\u51fd\u6570\u7c7b\u578b<\/h4>\n
            const<\/span> MyComponent<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  \/\/ \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ed\u30b8\u30c3\u30af<\/span>\r\n  return <\/span>(<\/span>\r\n    \/\/ JSX<\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\n<\/code><\/pre>\n
            \n
            \u7bad\u5934\u51fd\u6570\u7684\u4f7f\u7528\u4f18\u70b9<\/p>\n
            \u53ef\u4ee5\u5199\u5f97\u7b80\u6d01
            \n\u5173\u952e\u5b57\u201cthis\u201d\u7684\u884c\u4e3a\u662f\u201c\u5916\u90e8\u4f5c\u7528\u57df\u201d\u3002<\/p>\n<\/div>\n
            \u529f\u80fd\u7c7b\u578b<\/h4>\n
            function<\/span> MyComponent<\/span>()<\/span> {<\/span>\r\n  \/\/ \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ed\u30b8\u30c3\u30af<\/span>\r\n  return <\/span>(<\/span>\r\n    \/\/ JSX<\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
            \n
            \u4f7f\u7528function\u578b\u7684\u597d\u5904<\/p>\n
            \u65e0\u6cd5\u4f7f\u7528This\uff08\u4e0d\u4f7f\u7528This\uff09
            \n\u53ef\u4ee5\u4f7f\u7528new\u5173\u952e\u5b57<\/p>\n<\/div>\n
            \u51fd\u6570\u7ec4\u4ef6\uff08\u9ed8\u8ba4\u503c\u7684\u5b9a\u4e49\uff09\u3002<\/h3>\n
            const<\/span> SwitchComponent<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  \/\/ \u30b9\u30a4\u30c3\u30c1\u306e\u72b6\u614b\u3092 'MIN', '\u771f\u3093\u4e2d', 'MAX' \u306e\u3044\u305a\u308c\u304b\u3067\u7ba1\u7406<\/span>\r\n  const<\/span> [<\/span>status<\/span>,<\/span> setStatus<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>'<\/span>MIN<\/span>'<\/span>);<\/span>\r\n<\/code><\/pre>\n
            \u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\uff0c
            \n\u4f7f\u7528Const\u6765\u5f00\u5934\u5e76\u201c\u51b3\u5b9a\u51fd\u6570\u540d\u201d
            \n\u2192 \u201c\u9009\u62e9\u7bad\u5934\u51fd\u6570\u6216function\u201d
            \n\u2192 \u201c\u5b9a\u4e49useState\u7684\u521d\u59cb\u503c\uff0c\u6539\u53d8\u72b6\u6001\uff08state\uff09\uff0c\u4ee5\u53ca\u66f4\u65b0\u65f6\u7684\u72b6\u6001\uff08setState\uff09\u201d
            \n\u2192 \u201c\u5b9a\u4e49\u5207\u6362\u72b6\u6001\u7684\u52a8\u4f5c\u201d<\/p>\n
            \u7528\u8fd9\u4e2a\u6b65\u9aa4\u6765\u521b\u5efa\u3002<\/p>\n
            const<\/span> SwitchComponent<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  \/\/ \u30b9\u30a4\u30c3\u30c1\u306e\u72b6\u614b\u3092 'MIN', '\u771f\u3093\u4e2d', 'MAX' \u306e\u3044\u305a\u308c\u304b\u3067\u7ba1\u7406<\/span>\r\n  const<\/span> [<\/span>status<\/span>,<\/span> setStatus<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>'<\/span>MIN<\/span>'<\/span>);<\/span>\r\n<\/code><\/pre>\n
            \u300c\u72b6\u6001\u300d\u8fd9\u5c31\u50cf\u662f\u5bb6\u91cc\u7535\u706f\u6ce1\u7684\u5f00\u5173\uff08\u8c03\u7528\u5b83\u5c31\u4f1a\u6539\u53d8\u72b6\u6001\uff09<\/p>\n
            \u300cuseStatus\u300d\u6307\u7684\u662f\u5f00\u5173\u6253\u5f00\u65f6\u706f\u6ce1\u7684\u72b6\u6001
            \n\uff08\u6307\u793a\u66f4\u65b0\u540e\u7684\u65b0\u72b6\u6001\uff09<\/p>\n
              const<\/span> toggleStatus<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    \/\/ \u73fe\u5728\u306estatus\u306b\u57fa\u3065\u3044\u3066\u6b21\u306e\u72b6\u614b\u3092\u6c7a\u5b9a<\/span>\r\n    switch <\/span>(<\/span>status<\/span>)<\/span> {<\/span>  \/\/ status\u3067\u30b9\u30a4\u30c3\u30c1\u3092\u62bc\u3059<\/span>\r\n      case<\/span> '<\/span>MIN<\/span>'<\/span>:<\/span>  \/\/ \u4eca\u306e\u72b6\u614b\u304cMIN\u306ecase\u306a\u3089<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>\u771f\u3093\u4e2d<\/span>'<\/span>);<\/span>  \/\/ \u66f4\u65b0\u3055\u308c\u305f\u72b6\u614b\u306f\u201d\u771f\u3093\u4e2d\u201d\u306b\u306a\u308b<\/span>\r\n        break<\/span>;<\/span>  \/\/ \u51e6\u7406\u3092\u6b62\u3081\u308b<\/span>\r\n      case<\/span> '<\/span>\u771f\u3093\u4e2d<\/span>'<\/span>:<\/span> \/\/ \u4eca\u306e\u72b6\u614b\u304c\u201d\u771f\u3093\u4e2d\u201d\u306ecase\u306a\u3089<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>MAX<\/span>'<\/span>);<\/span> \/\/ \u66f4\u65b0\u3055\u308c\u305f\u72b6\u614b\u306f\u201dMAX\u201d\u306b\u306a\u308b<\/span>\r\n        break<\/span>;<\/span> \/\/ \u51e6\u7406\u3092\u6b62\u3081\u308b<\/span>\r\n      case<\/span> '<\/span>MAX<\/span>'<\/span>:<\/span> \/\/ \u4eca\u306e\u72b6\u614b\u304c\u201dMAX\u201d\u306ecase\u306a\u3089<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>MIN<\/span>'<\/span>);<\/span> \/\/ \u66f4\u65b0\u3055\u308c\u305f\u72b6\u614b\u306f\u201dMIN\u201d\u306b\u306a\u308b<\/span>\r\n        break<\/span>;<\/span> \/\/ \u51e6\u7406\u3092\u6b62\u3081\u308b<\/span>\r\n      default<\/span>:<\/span> \/\/ \u3069\u306ecase\u306b\u3082\u5f53\u3066\u306f\u307e\u3089\u306a\u3044\u5834\u5408\u306f<\/span>\r\n        setStatus<\/span>(<\/span>'<\/span>MIN<\/span>'<\/span>);<\/span> \/\/ \u66f4\u65b0\u3055\u308c\u305f\u72b6\u614b\u306f\u201dMIN\u201d\u306b\u306a\u308b<\/span>\r\n<\/code><\/pre>\n
            \u203b\u2018toggle\u2019\u8fd9\u4e2a\u8bcd\u6307\u7684\u662f\u5207\u6362\u67d0\u72b6\u6001\uff0c\u5c24\u5176\u662f\u5728\u4e24\u79cd\u72b6\u6001\u4e4b\u95f4\u4ea4\u66ff\u5207\u6362\u7684\u884c\u4e3a\u3002<\/p>\n
            jsx<\/h3>\n
              return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u73fe\u5728\u306e\u30b9\u30c6\u30fc\u30bf\u30b9: {<\/span>status<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>toggleStatus<\/span>}<\/span>><\/span>Toggle Status<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n<\/code><\/pre>\n
            \u8fd9\u6b21\u8fd9\u91cc\u6ca1\u6709\u7279\u522b\u7684\u89e3\u91ca\u3002\uff08\u5728\u5176\u4ed6\u5730\u65b9\u5df2\u7ecf\u8f93\u51fa\u4e86\uff09<\/p>\n
            \u4ea7\u51fa<\/h3>\n
            export<\/span> default<\/span> SwitchComponent<\/span>;<\/span>\r\n<\/code><\/pre>\n
            \n
            \u62bc\u3055\u3048\u3066\u304a\u304f\u3079\u304d\u70b9?<\/p>\n
            \u5728\u9700\u8981\u6539\u53d8\u72b6\u6001\u6216\u6dfb\u52a0\u52a8\u6001\u6548\u679c\u65f6\u53ef\u4ee5\u4f7f\u7528useState\u3002
            \n“\u58f0\u660e”\u2192”\u51fd\u6570\u7ec4\u4ef6”\u2192”JSX”\u2192”\u8f93\u51fa”<\/p>\n<\/div>\n
            \u53c2\u8003\u7684\u7f51\u7ad9\u3002<\/h2>\n
            #07 \u6700\u6613\u61c2\u7684React\u5165\u95e8\u3010\u57fa\u7840\u7bc7\u3011\u4e2d\u4f7f\u7528\u9891\u7e41\u7684useState\u7684\u4e09\u4e2a\u6848\u4f8b\u7cbe\u9009<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u9996\u5148 \u8fd9\u662f\u5173\u4e8eReact useState\u7684\u5907\u5fd8\u5f55? \u6211\u662f\u521d\u5b66\u8005? \u6211\u8ba4\u4e3a\u53ef\u80fd\u4f1a\u6709\u5f88\u591a\u9519\u8bef\u7684\u5730\u65b9\u3002 \u5982\u679c\u4f60\u53d1\u73b0 […]<\/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-38499","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nReact\u7684\u8bed\u6cd5\u548cuseState\u7684\u4f7f\u7528\u65b9\u6cd5\u5907\u5fd8\u5f55 - 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\u7684\u8bed\u6cd5\u548cusestate\u7684\u4f7f\u7528\u65b9\u6cd5\u5907\u5fd8\u5f55\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React\u7684\u8bed\u6cd5\u548cuseState\u7684\u4f7f\u7528\u65b9\u6cd5\u5907\u5fd8\u5f55\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u8fd9\u662f\u5173\u4e8eReact useState\u7684\u5907\u5fd8\u5f55? 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