{"id":38226,"date":"2023-01-04T07:56:22","date_gmt":"2023-12-01T13:38:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%af%b9-usesyncexternalstore-%e8%bf%9b%e8%a1%8c%e4%ba%86%e7%ae%80%e8%a6%81%e6%80%bb%e7%bb%93%e3%80%82\/"},"modified":"2024-04-29T08:28:19","modified_gmt":"2024-04-29T00:28:19","slug":"%e6%88%91%e5%af%b9-usesyncexternalstore-%e8%bf%9b%e8%a1%8c%e4%ba%86%e7%ae%80%e8%a6%81%e6%80%bb%e7%bb%93%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%af%b9-usesyncexternalstore-%e8%bf%9b%e8%a1%8c%e4%ba%86%e7%ae%80%e8%a6%81%e6%80%bb%e7%bb%93%e3%80%82\/","title":{"rendered":"\u6211\u5bf9 useSyncExternalStore \u8fdb\u884c\u4e86\u7b80\u8981\u603b\u7ed3"},"content":{"rendered":"

useSyncExternalStore \u7684\u610f\u601d\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u5728 React18 \u4e2d\uff0c\u901a\u8fc7\u65b0\u589e\u7684 React Hook\uff0c\u53ef\u4ee5\u8ba2\u9605\u5916\u90e8\u5b58\u50a8\u3002<\/p>\n

\u8003\u5bdf\u8fd9\u4e2a\u8bcd\u4ec0\u4e48\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u3002<\/h2>\n

\u4f7fReact Hook\u80fd\u591f\u8ba2\u9605\u5916\u90e8\u5b58\u50a8\u3002<\/p><\/blockquote>\n

\u5728\u4e4b\u524d\u7684\u8cc7\u6599\u4e2d\uff0c\u4e0d\u592a\u660e\u767d\uff0c\u6240\u4ee5\u6211\u60f3\u518d\u591a\u8abf\u67e5\u4e00\u4e0b\u3002\u7d93\u904e\u9032\u4e00\u6b65\u7814\u7a76\uff0c\u6587\u4ef6\u4e2d\u5beb\u660e\u4e86\u4ee5\u4e0b\u5167\u5bb9\u3002<\/p>\n

\u5927\u591a\u6570\u7684React\u7ec4\u4ef6\u5728props\u3001state\u548ccontext\u4e2d\u5f15\u7528\u6570\u636e\u3002
\n\u4f46\u662f\uff0c\u6709\u65f6\u4e5f\u9700\u8981\u4eceReact\u5916\u90e8\u7684\u6570\u636e\u6e90\u5f15\u7528\u503c\u3002
\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528useSyncExternalStore\u6765\u76d1\u89c6React\u5916\u90e8\u6570\u636e\u6e90\u7684\u5b58\u50a8\uff0c\u5e76\u5f15\u7528\u5b58\u50a8\u7684\u503c\u3002
\n\u4f8b\u5982)
\n\u7528\u4e8e\u4fdd\u6301\u72b6\u6001\u7684React\u5916\u90e8\u5e93
\n\u53ef\u4ee5\u8ba2\u9605\u6d4f\u89c8\u5668\u4e8b\u4ef6API\u7684\u53ef\u53d8\u503c\u548c\u5176\u53d8\u5316\u3002<\/p><\/blockquote>\n

\u56e0\u4e3a\u6211\u8fd8\u4e0d\u592a\u660e\u767d\uff0c\u6240\u4ee5\u6211\u9605\u8bfb\u4e86\u4e00\u4e9b\u6587\u4ef6\uff0c\u627e\u5230\u4e86\u4ee5\u4e0b\u63cf\u8ff0\u3002<\/p>\n

    \n
  1. \n
      \u5982\u679c\u60a8\u6b63\u5728React\u4e2d\u4f7f\u7528useState\u6216useReducer\u6765\u7ba1\u7406\u72b6\u6001\uff0c\u5efa\u8bae\u60a8\u4f7f\u7528\u5b83\u4eec\u3002useSyncExternalStore API\u4e3b\u8981\u7528\u4e8e\u4e0e\u73b0\u6709\u7684\u975eReact\u4ee3\u7801\u96c6\u6210\u7684\u60c5\u51b5\u3002<\/ol>\n<\/li>\n<\/ol>\n

      \u6dfb\u52a0useSyncExternalStore\u7684\u53e6\u4e00\u4e2a\u539f\u56e0\u662f\u5982\u679c\u60a8\u9700\u8981\u8ba2\u9605\u5728\u6d4f\u89c8\u5668\u4e2d\u516c\u5f00\u7684\u5e76\u4e14\u4f1a\u53d1\u751f\u53d8\u5316\u7684\u503c\u3002<\/p>\n

      \u4f7f\u7528\u60c5\u666f<\/h2>\n

      \u7ecf\u8fc7\u8c03\u67e5\u7814\u7a76\u540e\uff0c\u6211\u4ee5\u81ea\u5df1\u7684\u65b9\u5f0f\u5bf9\u6240\u53d1\u73b0\u7684\u4e00\u4e9b\u4e8b\u60c5\u8fdb\u884c\u4e86\u4ee5\u4e0b\u89e3\u91ca\u3002\u6211\u89c9\u5f97\u73b0\u5728\u5bf9\u6b64\u6709\u4e86\u4e00\u4e2a\u6bd4\u8f83\u6e05\u6670\u7684\u60f3\u8c61\u3002<\/p>\n

      \u975eReact\u30b3\u30fc\u30c9\u3068\u7d71\u5408\u3057\u3066\u72b6\u614b\u7ba1\u7406\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408<\/p>\n

      useState \/ useReducer \/ \u30e9\u30a4\u30d6\u30e9\u30ea \u7b49\u3092\u7528\u3044\u3066\u3082 React \u3067\u72b6\u614b\u7ba1\u7406\u304c\u3067\u304d\u306a\u3044\u5834\u5408<\/p>\n

      React \u3092\u901a\u3055\u305a\u306b\u30d6\u30e9\u30a6\u30b6\u5074\u3067\u8d77\u3053\u3063\u305f\u5909\u5316\u3092\u7ba1\u7406\u3059\u308b\u5834\u5408<\/p>\n

      \u4f7f\u7528\u65b9\u6cd5<\/h2>\n

      \u672c\u6b21\u6211\u4eec\u5c06\u8ba8\u8bba\u5728 React \u4e2d\u8bfb\u53d6\u96be\u4ee5\u68c0\u6d4b\u7684\u6d4f\u89c8\u5668\u72b6\u6001\u7ba1\u7406\u4e8b\u4ef6\u7684\u60c5\u51b5\uff0c\u8fd9\u4e5f\u5728\u6587\u6863\u4e2d\u6709\u63d0\u53ca\uff0c\u6211\u4eec\u8981\u505a\u7684\u662f\u5c06\u7f51\u7edc\u8fde\u63a5\u662f\u5426\u5904\u4e8e\u6d3b\u52a8\u72b6\u6001\u663e\u793a\u5728\u7ec4\u4ef6\u4e0a\u3002<\/p>\n

      \u6d4f\u89c8\u5668\u901a\u8fc7navigator.onLine\u5c5e\u6027\u516c\u5f00\u7f51\u7edc\u8fde\u63a5\u72b6\u6001\u3002\u7531\u4e8e\u8fd9\u4e2a\u503c\u53ef\u80fd\u5728React\u4e0d\u77e5\u60c5\u7684\u60c5\u51b5\u4e0b\u88ab\u6539\u53d8\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u7528useSyncExternalStore\u6765\u8bfb\u53d6\u5b83\u3002<\/div>\n

      \u9996\u5148\uff0c\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u5728\u9875\u9762\u4e0a\u663e\u793a\u7f51\u7edc\u72b6\u51b5\u7684\u6846\u67b6\u3002\u6709\u5173\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u6b64\u5904\u3002<\/p>\n

      import<\/span> {<\/span> useSyncExternalStore<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> useOnlineStatus<\/span>()<\/span> {<\/span>\r\n  \/\/ subscribe: \u30b9\u30c8\u30a2\u304c\u5909\u66f4\u3055\u308c\u308b\u305f\u3073\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u767b\u9332\u3059\u308b<\/span>\r\n  \/\/ getSnapshot: \u73fe\u5728\u306e\u30b9\u30c8\u30a2\u306e\u5024\u3092\u8fd4\u3059<\/span>\r\n  return<\/span> useSyncExternalStore<\/span>(<\/span>subscribe<\/span>,<\/span> getSnapshot<\/span>);<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> isOnline<\/span> =<\/span> useOnlineStatus<\/span>();<\/span>\r\n  return<\/span> <<\/span>h1<\/span>><\/span>{<\/span>isOnline<\/span> ?<\/span> '<\/span>\u2705 Online<\/span>'<\/span> :<\/span> '<\/span>\u274c Disconnected<\/span>'<\/span>}<\/span><\/<\/span>h1<\/span>>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u8981\u5b9e\u73b0 getSnapshot \u51fd\u6570\uff0c\u9700\u8981\u4ece\u6d4f\u89c8\u5668 API \u4e2d\u8bfb\u53d6\u5f53\u524d\u503c\u3002<\/p>\n
      function<\/span> getSnapshot<\/span>()<\/span> {<\/span>\r\n  return<\/span> navigator<\/span>.<\/span>onLine<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u8981\u5b9e\u73b0subscribe\u51fd\u6570\uff0c\u4f60\u9700\u8981\u5c06\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6ce8\u518c\u5230\u76f8\u5e94\u7684\u4e8b\u4ef6\u4e0a\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\u6765\u89e3\u9664\u6ce8\u518c\u3002\u5f53navigator.onLine\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u6d4f\u89c8\u5668\u4f1a\u5728window\u5bf9\u8c61\u4e0a\u89e6\u53d1\u5728\u7ebf\u548c\u79bb\u7ebf\u4e8b\u4ef6\u3002<\/p>\n
      function<\/span> subscribe<\/span>(<\/span>callback<\/span>)<\/span> {<\/span>\r\n  window<\/span>.<\/span>addEventListener<\/span>(<\/span>'<\/span>online<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n  window<\/span>.<\/span>addEventListener<\/span>(<\/span>'<\/span>offline<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n  return <\/span>()<\/span> =><\/span> {<\/span>\r\n    window<\/span>.<\/span>removeEventListener<\/span>(<\/span>'<\/span>online<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n    window<\/span>.<\/span>removeEventListener<\/span>(<\/span>'<\/span>offline<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n  };<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u901a\u8fc7\u5728 useSyncExternalStore \u51fd\u6570\u4e2d\u5c06 subscribe \u548c getSnapshot \u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u53ef\u4ee5\u8bfb\u53d6 navigator.onLine \u7684\u503c\u5e76\u8fdb\u884c\u8ba2\u9605\u4ee5\u83b7\u53d6\u53d8\u5316\u3002\u7ed3\u679c\u5c06\u8fd4\u56de True \u6216 False\u3002<\/p>\n
      import<\/span> {<\/span> useSyncExternalStore<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> subscribe<\/span>(<\/span>callback<\/span>)<\/span> {<\/span>\r\n  window<\/span>.<\/span>addEventListener<\/span>(<\/span>'<\/span>online<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n  window<\/span>.<\/span>addEventListener<\/span>(<\/span>'<\/span>offline<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n  return <\/span>()<\/span> =><\/span> {<\/span>\r\n    window<\/span>.<\/span>removeEventListener<\/span>(<\/span>'<\/span>online<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n    window<\/span>.<\/span>removeEventListener<\/span>(<\/span>'<\/span>offline<\/span>'<\/span>,<\/span> callback<\/span>);<\/span>\r\n  };<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> getSnapshot<\/span>()<\/span> {<\/span>\r\n  return<\/span> navigator<\/span>.<\/span>onLine<\/span>;<\/span>\r\n}<\/span>\r\n\r\nfunction<\/span> useOnlineStatus<\/span>()<\/span> {<\/span>\r\n  return<\/span> useSyncExternalStore<\/span>(<\/span>subscribe<\/span>,<\/span> getSnapshot<\/span>);<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> isOnline<\/span> =<\/span> useOnlineStatus<\/span>();<\/span>\r\n  return<\/span> <<\/span>h1<\/span>><\/span>{<\/span>isOnline<\/span> ?<\/span> '<\/span>\u2705 Online<\/span>'<\/span> :<\/span> '<\/span>\u274c Disconnected<\/span>'<\/span>}<\/span><\/<\/span>h1<\/span>>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u5916\u4f20<\/h2>\n
      \u987a\u4fbf\u4e00\u63d0\uff0c\u5982\u679c\u4f7f\u7528 useEffect \u8fdb\u884c\u5b9e\u73b0\uff0c\u4ee3\u7801\u4f1a\u50cf\u8fd9\u6837\u3002
      \n\u4e0d\u8fc7\uff0c\u6839\u636e\u6211\u521a\u624d\u89e3\u91ca\u7684\uff0c\u4f3c\u4e4e\u5728 React 18 \u4e4b\u540e\u4f7f\u7528 useSyncExternalStore \u66f4\u597d\u3002<\/p>\n
      import<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> useOnlineStatus<\/span>()<\/span> {<\/span>\r\n  \/\/ \u7406\u60f3\u7684\u3067\u306f\u3042\u308a\u307e\u305b\u3093<\/span>\r\n  const<\/span> [<\/span>isOnline<\/span>,<\/span> setIsOnline<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>true<\/span>);<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    function<\/span> updateState<\/span>()<\/span> {<\/span>\r\n      setIsOnline<\/span>(<\/span>navigator<\/span>.<\/span>onLine<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    updateState<\/span>();<\/span>\r\n\r\n    window<\/span>.<\/span>addEventListener<\/span>(<\/span>'<\/span>online<\/span>'<\/span>,<\/span> updateState<\/span>);<\/span>\r\n    window<\/span>.<\/span>addEventListener<\/span>(<\/span>'<\/span>offline<\/span>'<\/span>,<\/span> updateState<\/span>);<\/span>\r\n    return <\/span>()<\/span> =><\/span> {<\/span>\r\n      window<\/span>.<\/span>removeEventListener<\/span>(<\/span>'<\/span>online<\/span>'<\/span>,<\/span> updateState<\/span>);<\/span>\r\n      window<\/span>.<\/span>removeEventListener<\/span>(<\/span>'<\/span>offline<\/span>'<\/span>,<\/span> updateState<\/span>);<\/span>\r\n    };<\/span>\r\n  },<\/span> []);<\/span>\r\n  return<\/span> isOnline<\/span>;<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> isOnline<\/span> =<\/span> useOnlineStatus<\/span>();<\/span>\r\n  return<\/span> <<\/span>h1<\/span>><\/span>{<\/span>isOnline<\/span> ?<\/span> '<\/span>\u2705 Online<\/span>'<\/span> :<\/span> '<\/span>\u274c Disconnected<\/span>'<\/span>}<\/span><\/<\/span>h1<\/span>>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u53ea\u4f7f\u7528 useEffect \u5b9e\u73b0\u65f6\uff0c\u4e0e useSyncExternalStore \u76f8\u6bd4\u53ef\u80fd\u4f1a\u6709\u4e00\u4e9b\u7f3a\u70b9\uff0c\u4f46\u7531\u4e8e\u6ca1\u6709\u8be6\u7ec6\u7814\u7a76\u548c\u65f6\u95f4\u9650\u5236\uff0c\u6211\u5e0c\u671b\u7a0d\u540e\u8865\u5145\u3002\u3002\u3002<\/p>\n
      \u5bf9\u4e8e\u53ef\u8bfb\u6027\u800c\u8a00\uff0c\u6211\u8ba4\u4e3a\u4f7f\u7528 useSyncExternalStore \u66f4\u597d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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