{"id":38672,"date":"2023-11-29T09:15:24","date_gmt":"2023-08-28T17:02:00","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8-react18-%e4%b8%ad%e7%9a%84%e7%b1%bb%e4%bc%bc-signals-%e7%9a%84%e5%8a%9f%e8%83%bd\/"},"modified":"2024-01-15T10:00:08","modified_gmt":"2024-01-15T02:00:08","slug":"%e5%9c%a8-react18-%e4%b8%ad%e7%9a%84%e7%b1%bb%e4%bc%bc-signals-%e7%9a%84%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8-react18-%e4%b8%ad%e7%9a%84%e7%b1%bb%e4%bc%bc-signals-%e7%9a%84%e5%8a%9f%e8%83%bd\/","title":{"rendered":"\u5728 React@18 \u4e2d\u7684\u7c7b\u4f3c Signals \u7684\u529f\u80fd"},"content":{"rendered":"

\u4fe1\u865f\u662f\u6307<\/h1>\n

Preact \u65b0\u589e\u4e86\u540d\u4e3a Signals \u7684\u65b0\u529f\u80fd\u3002<\/p>\n

\u4ecb\u7ecd\u4fe1\u53f7 – PREACT
\n\u9884\u8b66\u4fe1\u53f7 – PREACT<\/p><\/blockquote>\n

\u4ee5\u4e0b\u662f\u4e00\u79cd\u53ef\u80fd\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u89e3\u51b3State\u7684\u6876\u63a5\u529b\u95ee\u9898\uff0c\u76f8\u6bd4\u4e8eContext\u7b49\u3002<\/p>\n

import<\/span> {<\/span> signal<\/span> }<\/span> from<\/span> \"<\/span>@preact\/signals<\/span>\"<\/span>\r\n\r\nconst<\/span> count<\/span> =<\/span> signal<\/span>(<\/span>0<\/span>)<\/span>\r\n\r\nconst<\/span> Counter<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> increment<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    count<\/span>.<\/span>value<\/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>value<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>increment<\/span>}<\/span>><\/span>click me<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  )<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u300cSignals\u300d\u5728SolidJS\u4e2d\u4e5f\u5b58\u5728\uff0c\u53ef\u4ee5\u8bf4\u662f\u6700\u8fd1\u7684\u8d8b\u52bf\u3002
\n\u4e5f\u8bb8\u6709\u4e9b\u4eba\u4f1a\u56e0\u4e3a\u300cSignals\u300d\u800c\u60f3\u4eceReact\u8f6c\u5230Preact\u6216SolidJS\u3002<\/p>\n
\u5373\u4f7f\u5728 React@18 \u4e2d\uff0c\u6a21\u62df\u4fe1\u53f7\u4e5f\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u5b9e\u73b0\u3002<\/h1>\n
\u7136\u800c\uff0c\u4f7f\u7528 useSyncExternalStore \u8fd9\u4e2a Hook\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u5728 React@18 \u4e2d\u5b9e\u73b0\u4e00\u4e2a\u7c7b\u4f3c\u4e8e Signals \u7684\u529f\u80fd\uff0c\u56e0\u6b64\uff0c\u5c1d\u8bd5\u4f7f\u7528\u5b83\u6765\u89c2\u5bdf React \u7684\u5185\u90e8\u8fd0\u4f5c\u65b9\u5f0f\uff0c\u53ef\u80fd\u4e5f\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n
<!DOCTYPE html><\/span>\r\n<html><\/span>\r\n  <head><\/span>\r\n    <meta<\/span> charset=<\/span>\"UTF-8\"<\/span>><\/span>\r\n    <meta<\/span> name=<\/span>\"viewport\"<\/span> content=<\/span>\"width=device-width\"<\/span>><\/span>\r\n  <\/head><\/span>\r\n  <body><\/span>\r\n    <div<\/span> id=<\/span>\"app\"<\/span>><\/div><\/span>\r\n\r\n    <script <\/span>crossorigin<\/span> src=<\/span>\"https:\/\/unpkg.com\/react@18\/umd\/react.production.min.js\"<\/span>><\/script><\/span>\r\n    <script <\/span>crossorigin<\/span> src=<\/span>\"https:\/\/unpkg.com\/react-dom@18\/umd\/react-dom.production.min.js\"<\/span>><\/script><\/span>\r\n  \r\n    <script><\/span>\r\n\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span>\r\n\r\nconst<\/span> gV<\/span> =<\/span> {}<\/span>\r\n\r\nconst<\/span> signal<\/span> =<\/span> iniValue<\/span> =><\/span> {<\/span>\r\n  const<\/span> key<\/span> =<\/span> Symbol<\/span>()<\/span>\r\n  gV<\/span>[<\/span>key<\/span>]<\/span> =<\/span> {<\/span>value<\/span>:<\/span> iniValue<\/span>,<\/span> fList<\/span>:<\/span> new<\/span> Set<\/span>()}<\/span>\r\n  return<\/span> {<\/span>\r\n    get<\/span> value<\/span>()<\/span> {<\/span>\r\n      return<\/span> gV<\/span>[<\/span>key<\/span>].<\/span>value<\/span>\r\n    },<\/span>\r\n    set<\/span> value<\/span>(<\/span>newValue<\/span>)<\/span> {<\/span>\r\n      if <\/span>(<\/span>gV<\/span>[<\/span>key<\/span>].<\/span>value<\/span> ===<\/span> newValue<\/span>)<\/span> return<\/span>;<\/span>\r\n      gV<\/span>[<\/span>key<\/span>].<\/span>value<\/span> =<\/span> newValue<\/span>\r\n      gV<\/span>[<\/span>key<\/span>].<\/span>fList<\/span>.<\/span>forEach<\/span>(<\/span>f<\/span> =><\/span> f<\/span>())<\/span>\r\n    },<\/span>\r\n    _subscribe<\/span>:<\/span> notify<\/span> =><\/span> gV<\/span>[<\/span>key<\/span>].<\/span>fList<\/span>.<\/span>add<\/span>(<\/span>notify<\/span>),<\/span> \r\n    _unsubscribe<\/span>:<\/span> notify<\/span> =><\/span> gV<\/span>[<\/span>key<\/span>].<\/span>fList<\/span>.<\/span>delete<\/span>(<\/span>notify<\/span>),<\/span>\r\n    _remove<\/span>:<\/span> ()<\/span> =><\/span> delete<\/span> gV<\/span>[<\/span>key<\/span>],<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> useSignal<\/span> =<\/span> (...<\/span>signals<\/span>)<\/span> =><\/span> signals<\/span>.<\/span>map<\/span>(<\/span>item<\/span> =><\/span> React<\/span>.<\/span>useSyncExternalStore<\/span>(<\/span>\r\n  \/\/ subscribe<\/span>\r\n  notify<\/span> =><\/span> {<\/span>\r\n    item<\/span>.<\/span>_subscribe<\/span>(<\/span>notify<\/span>)<\/span>\r\n    return <\/span>()<\/span> =><\/span> {<\/span>\r\n      \/\/ unsubscribe<\/span>\r\n      item<\/span>.<\/span>_unsubscribe<\/span>(<\/span>notify<\/span>)<\/span>\r\n    }<\/span>\r\n  },<\/span>\r\n\r\n  \/\/ getSnapshot<\/span>\r\n  ()<\/span> =><\/span> item<\/span>.<\/span>value<\/span>,<\/span>\r\n))<\/span>\r\n\r\n\r\nconst<\/span> count1<\/span> =<\/span> signal<\/span>(<\/span>0<\/span>)<\/span>\r\nconst<\/span> count2<\/span> =<\/span> signal<\/span>(<\/span>0<\/span>)<\/span>\r\n\r\nconst<\/span> Button1<\/span> =<\/span> props<\/span> =><\/span> {<\/span>\r\n  useSignal<\/span>(<\/span>count1<\/span>)<\/span>\r\n  return<\/span> React<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>button<\/span>'<\/span>,<\/span> {<\/span>\r\n    onClick<\/span>:<\/span> e<\/span> =><\/span> count1<\/span>.<\/span>value<\/span>++<\/span>,<\/span>\r\n  },<\/span> count1<\/span>.<\/span>value<\/span>)<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> Button2<\/span> =<\/span> props<\/span> =><\/span> {<\/span>\r\n  useSignal<\/span>(<\/span>count2<\/span>)<\/span>\r\n  return<\/span> React<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>button<\/span>'<\/span>,<\/span> {<\/span>\r\n    onClick<\/span>:<\/span> e<\/span> =><\/span> count2<\/span>.<\/span>value<\/span>++<\/span>,<\/span>\r\n  },<\/span> count2<\/span>.<\/span>value<\/span>)<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> App<\/span> =<\/span> props<\/span> =><\/span> {<\/span>\r\n  return<\/span> React<\/span>.<\/span>createElement<\/span>(<\/span>React<\/span>.<\/span>Fragment<\/span>,<\/span> {},<\/span> [<\/span>\r\n    React<\/span>.<\/span>createElement<\/span>(<\/span>Button1<\/span>),<\/span>\r\n    React<\/span>.<\/span>createElement<\/span>(<\/span>Button1<\/span>),<\/span>\r\n    React<\/span>.<\/span>createElement<\/span>(<\/span>Button1<\/span>),<\/span>\r\n    React<\/span>.<\/span>createElement<\/span>(<\/span>Button2<\/span>),<\/span>\r\n    React<\/span>.<\/span>createElement<\/span>(<\/span>Button2<\/span>),<\/span>\r\n    React<\/span>.<\/span>createElement<\/span>(<\/span>Button2<\/span>),<\/span>\r\n  ])<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> root<\/span> =<\/span> ReactDOM<\/span>.<\/span>createRoot<\/span>(<\/span>document<\/span>.<\/span>getElementById<\/span>(<\/span>\"<\/span>app<\/span>\"<\/span>))<\/span>\r\nroot<\/span>.<\/span>render<\/span>(<\/span>React<\/span>.<\/span>createElement<\/span>(<\/span>App<\/span>))<\/span>\r\n    \r\n\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span>\r\n    <\/script><\/span>\r\n  \r\n  <\/body><\/span>\r\n\r\n<\/html><\/span>\r\n<\/code><\/pre>\n
\u8fd9\u91cc\u5c31\u5230\u73b0\u573a\u5c31\u5b8c\u4e86\u3002<\/h1>\n
\u975e\u5e38\u611f\u8c22\u60a8\u4e00\u76f4\u966a\u4f34\u6211\u5199\u4e0b\u8fd9\u6837\u62d9\u52a3\u7684\u6587\u7ae0\uff0c\u76f4\u5230\u6700\u540e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4fe1\u865f\u662f\u6307 Preact \u65b0\u589e\u4e86\u540d\u4e3a Signals \u7684\u65b0\u529f\u80fd\u3002 \u4ecb\u7ecd\u4fe1\u53f7 – PREACT \u9884\u8b66\u4fe1 […]<\/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-38672","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u5728 React@18 \u4e2d\u7684\u7c7b\u4f3c Signals \u7684\u529f\u80fd - 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\/\u5728-react18-\u4e2d\u7684\u7c7b\u4f3c-signals-\u7684\u529f\u80fd\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5728 React@18 \u4e2d\u7684\u7c7b\u4f3c Signals \u7684\u529f\u80fd\" \/>\n<meta property=\"og:description\" content=\"\u4fe1\u865f\u662f\u6307 Preact \u65b0\u589e\u4e86\u540d\u4e3a Signals \u7684\u65b0\u529f\u80fd\u3002 \u4ecb\u7ecd\u4fe1\u53f7 – PREACT \u9884\u8b66\u4fe1 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728-react18-\u4e2d\u7684\u7c7b\u4f3c-signals-\u7684\u529f\u80fd\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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