{"id":1273,"date":"2023-02-27T16:00:04","date_gmt":"2023-02-27T08:00:04","guid":{"rendered":"https:\/\/fdream.net\/blog\/?p=1273"},"modified":"2023-02-27T16:00:04","modified_gmt":"2023-02-27T08:00:04","slug":"usesignal-%e5%89%8d%e7%ab%af%e6%a1%86%e6%9e%b6%e7%9a%84%e6%9c%aa%e6%9d%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fdream.net\/blog\/article\/1273","title":{"rendered":"useSignal()\u2014\u2014\u524d\u7aef\u6846\u67b6\u7684\u672a\u6765\uff1f"},"content":{"rendered":"\n

Angular\u4ee5\u53caQwik\u7684\u4f5c\u8005MI\u0160KO HEVERY\u5199\u4e86\u7bc7\u6587\u7ae0\uff1auseSignal()\u624d\u662fWeb\u6846\u67b6\u7684\u672a\u6765\uff08useSignal() is the Future of Web Frameworks\uff09<\/a>\uff0c\u4e5f\u5f15\u8d77\u4e00\u4e9b\u8ba8\u8bba\u3002\u5305\u62ecQwik\u5728\u5185\u7684\u591a\u4e2a\u6846\u67b6\u4e5f\u5df2\u7ecf\u5b9e\u73b0\u4e86useSignal()<\/code>\uff0c\u8fd9\u4e9b\u6846\u67b6\u8fd8\u6709Vue\u3001Preact\u3001Solid\u4ee5\u53caSvelte\u7b49\u3002<\/p>\n\n\n\n

\u5b9e\u9645\u4e0asignals\u5e76\u4e0d\u662f\u4e00\u4e2a\u5168\u65b0\u7684\u6982\u5ff5\uff0c\u5927\u7ea6\u5341\u5e74\u524d\u7684\u6846\u67b6Knockout\u5c31\u66fe\u7ecf\u4f7f\u7528\u8fc7\u3002\u90a3\u4e3a\u4ec0\u4e48\u6700\u8fd1\u7a81\u7136\u53c8\u91cd\u63d0\u6b64\u9879\u6280\u672f\uff1f\u8fd9\u4e3b\u8981\u5f97\u76ca\u4e8e\u5f53\u4eca\u66f4\u52a0\u5148\u8fdb\u7684\u7f16\u8bd1\u6280\u5de7\u4ee5\u53ca\u4e0ejsx\u7684\u6df1\u5ea6\u96c6\u6210\uff0c\u4f7fsignals\u7684\u5f00\u53d1\u4f53\u9a8c\u53d8\u5f97\u66f4\u597d\u4e86\u3002<\/p>\n\n\n\n

\u4ec0\u4e48\u662fsignal<\/h2>\n\n\n\n

\u5982\u679c\u4e86\u89e3\u8fc7React\u7684\u8bdd\uff0csignal\u5176\u5b9e\u548cuseState<\/code>\u975e\u5e38\u7c7b\u4f3c\uff0c\u4e5f\u662f\u4e00\u79cd\u7528\u6765\u5b58\u50a8\u5e94\u7528\u72b6\u6001\u7684\u65b9\u5f0f\u3002\u4f46\u662f\u548cuseState<\/code>\u5b58\u5728\u4e00\u4e9b\u533a\u522b\uff1a<\/p>\n\n\n\n

useState<\/code>\u662f\u8fd4\u56de\u4e00\u4e2a\u503c\u4ee5\u53ca\u4e00\u4e2aset\u65b9\u6cd5\uff0c\u800cuseSignal<\/code>\u5219\u662f\u8fd4\u56de\u4e00\u4e2agetter<\/code>\u548c\u4e00\u4e2asetter<\/code>\uff0c\u53c2\u89c1\u5982\u4e0b\u8868\u793a\uff1a<\/p>\n\n\n\n

useState() => value + setter\nuseSignal() => getter + setter<\/code><\/pre>\n\n\n\n
\u8fd9\u4e24\u79cd\u8fd4\u56de\u6709\u4ec0\u4e48\u533a\u522b\u5417\uff1f\u6211\u4eec\u6765\u8ba8\u8bba\u4e00\u4e0bstate\u7684\u610f\u4e49\u3002<\/p>\n\n\n\n
State\u7684\u610f\u4e49<\/h2>\n\n\n\n
state\u6709\u4e24\u4e2a\u72ec\u7acb\u7684\u542b\u4e49\uff1a<\/p>\n\n\n\n
    \n
  1. \u72b6\u6001\u5f15\u7528\u2014\u2014\u5bf9\u5f53\u524d\u72b6\u6001\u5f15\u7528\u3002<\/li>\n\n\n\n
  2. \u72b6\u6001\u503c\u2014\u2014\u72b6\u6001\u5f15\u7528\u4e2d\u5b58\u50a8\u7684\u72b6\u6001\u503c\u3002<\/li>\n<\/ol>\n\n\n\n
    \u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5728React\u4e2d\uff0c\u6211\u4eec\u662f\u8fd9\u6837\u5b9a\u4e49state\u7684\uff1a<\/p>\n\n\n\n
    export function Counter() {\n  const [count, setCount] = useState(0);\n\n  return (\n    <button onClick={() => setCount(count + 1)}>\n      {count}\n    <\/button>\n  );\n}<\/code><\/pre>\n\n\n\n
    \u5728\u8fd9\u4e2a\u91cc\u9762\uff0cuseState<\/code>\u8fd4\u56de\u7684\u5185\u5bb9\u5305\u62ec\u4e24\u9879\uff1a<\/p>\n\n\n\n
      \n
    1. count<\/code>\u2014\u2014\u72b6\u6001\u7684\u503c<\/li>\n\n\n\n
    2. setCount<\/code>\u2014\u2014\u72b6\u6001\u7684setter<\/code><\/li>\n<\/ol>\n\n\n\n
      \u6211\u4eec\u518d\u6765\u770b\u4e00\u770b\u4f7f\u7528signal\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n
      export function Counter() {\n  const [getCount, setCount] = createSignal(0);\n\n  return (\n    <button onClick={() => setCount(getCount() + 1)}>\n      {getCount()}\n    <\/button>\n  );\n}<\/code><\/pre>\n\n\n\n
      createSignal\u8fd4\u56de\u7684\u90e8\u5206\u4e5f\u5305\u62ec\u4e24\u90e8\u5206\uff1a<\/p>\n\n\n\n
        \n
      1. getCount<\/code>\u2014\u2014\u72b6\u6001\u7684\u5f15\u7528<\/li>\n\n\n\n
      2. setCount<\/code>\u2014\u2014\u72b6\u6001\u7684setter<\/code><\/li>\n<\/ol>\n\n\n\n
        \u770b\u8d77\u6765\u4f3c\u4e4e\u4e5f\u6ca1\u592a\u5927\u533a\u522b\u5bf9\u4e0d\u5bf9\uff1f\u4ed6\u4eec\u5230\u5e95\u6709\u4ec0\u4e48\u7528\u5462\uff1f<\/p>\n\n\n\n
        Signal\u4e0eState<\/h2>\n\n\n\n
        \u4e8c\u8005\u4e4b\u95f4\u7684\u6700\u5927\u533a\u522b\u5728\u4e8e\uff1aSignal\u53ef\u4ee5\u901a\u8fc7<\/strong>getter<\/strong><\/code>\u53bb\u611f\u77e5\u4e0a\u4e0b\u6587\uff0c\u77e5\u9053\u662f\u8c01\u5728\u4ec0\u4e48\u5730\u65b9\u5f15\u7528\uff08\u8ba2\u9605\uff09\u4e86\u8fd9\u4e2a\u72b6\u6001\uff0c\u4ece\u800c\u53ef\u4ee5\u5728\u8fd9\u4e2a\u72b6\u6001\u53d1\u751f\u6539\u53d8\u7684\u65f6\u5019\u76f4\u63a5\u901a\u77e5\u8fd9\u4e2a\u5bf9\u8c61\uff08\u8ba2\u9605\u8005\uff09\u3002\u901a\u8fc7\u8fd9\u4e2a\u4e0a\u4e0b\u6587\u611f\u77e5\uff0c\u4ece\u800c\u53ef\u4ee5\u505a\u5230\u66f4\u7ec6\u9897\u7c92\u5ea6\u7684\u5c40\u90e8\u66f4\u65b0\u3002\u800cState\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u72b6\u6001\u503c\uff0c\u6240\u4ee5State\u65e0\u6cd5\u77e5\u9053\u662f\u7ec4\u4ef6\u7684\u54ea\u4e00\u90e8\u5206\u4f7f\u7528\u4e86\u8fd9\u4e2a\u72b6\u6001\uff0c\u56e0\u6b64\u5728\u72b6\u6001\u53d1\u751f\u6539\u53d8\u65f6\u5fc5\u987b\u91cd\u65b0\u6e32\u67d3\u6574\u4e2a\u7ec4\u4ef6\u3002<\/strong><\/p>\n\n\n\n
        \u8fd8\u662f\u7528\u4e0a\u9762\u7684React\u7684\u4f8b\u5b50\uff0c\u5f53\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u8c03\u7528setState<\/code>\u65b9\u6cd5\u66f4\u65b0\u72b6\u6001\uff0cReact\u5e76\u4e0d\u77e5\u9053\u8fd9\u4e2a\u9875\u9762\u7684\u54ea\u4e9b\u90e8\u5206\u5f15\u7528\u4e86\u8fd9\u4e2a\u72b6\u6001\uff0c\u56e0\u6b64\u4f1a\u5bf9\u6574\u4e2aCounter<\/code>\u7ec4\u4ef6\u8fdb\u884c\u6e32\u67d3\u3002\u5f53\u8fd9\u4e2a\u7ec4\u4ef6\u53d8\u5f97\u590d\u6742\u65f6\uff0c\u53ef\u4ee5\u60f3\u8c61\u8fd9\u4e2a\u5f00\u9500\u662f\u975e\u5e38\u5927\u7684\u3002<\/p>\n\n\n\n
        \u6211\u4eec\u518d\u6765\u770b\u770b\u5728Qwik\u4e2d\u4f7f\u7528useSignal<\/code>\u7684\u7528\u6cd5\uff1a<\/p>\n\n\n\n
        export function Counter() {\n  const count = useSignal(0);\n\n  return (\n    <button onClick$={() => count.value++}>\n      {count.value}\n    <\/button>\n  );\n}<\/code><\/pre>\n\n\n\n
        \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c.value<\/code>\u5c5e\u6027\u4ee3\u8868\u7684\u5176\u5b9e\u662f\u4e00\u4e2agetter<\/code>\u548c\u4e00\u4e2asetter<\/code>\uff0c\u53ea\u662f\u8bed\u6cd5\u4e0d\u4e00\u6837\u800c\u5df2\u3002\u5728\u8fd9\u4e2a\u91cc\u9762\uff0c\u7531\u4e8e\u4f7f\u7528\u4e86getter<\/code>\uff0csignal\u77e5\u9053\u4e86\u53ea\u6709\u4e00\u4e2a\u6587\u672c\u8282\u70b9\u4f7f\u7528\u4e86count.value<\/code>\uff0c\u4e8e\u662f\u5f53\u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u53ea\u9700\u8981\u66f4\u65b0\u8fd9\u4e2a\u6587\u672c\u8282\u70b9\u5373\u53ef\uff0c\u800c\u65e0\u9700\u66f4\u65b0\u6574\u4e2a\u7ec4\u4ef6\u3002<\/p>\n\n\n\n
        \u590d\u6742\u4e00\u70b9\u7684\u4f8b\u5b50<\/h2>\n\n\n\n
        \u4e00\u4e2a\u7a0d\u5fae\u590d\u6742\u4e00\u70b9\u7684\u4f8b\u5b50\uff0c\u5305\u542b\u4e24\u4e2a\u8ba1\u6570\u5668\u6309\u94ae\u4ee5\u53ca\u4e24\u4e2a\u5c55\u793a\u7ec4\u4ef6\uff1a<\/p>\n\n\n\n
        export function Counter() {\n  console. log('<Counter\/>');\n  const countA = useSignal (0);\n  const countB = useSignal (0);\n  return (\n    <div>\n      <button onclick$={() => countA.value++}>A<\/button>\n      <button onClick$={() => countB.value++}>B<\/button>\n      <Display count={countA.value} \/>\n      <Display count={countB.value} \/>\n    <\/div>\n  );\n}\n\nexport const Display = component$(\n  ({ count }: { count: number }) => {\n    console. log ('<Display count={${count}}\/>');\n    return <div>{count}!\u2039\/div>;\n  }\n);<\/code><\/pre>\n\n\n\n
        \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u53ea\u6709\u9700\u8981\u66f4\u65b0\u7684Display<\/code>\u7ec4\u4ef6\u624d\u4f1a\u66f4\u65b0\uff0c\u53e6\u5916\u4e00\u4e2a\u65e0\u9700\u66f4\u65b0\u7684\u7ec4\u4ef6\u5219\u4e0d\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n\n\n\n
        # \u521d\u59cb\u6e32\u67d3\u8f93\u51fa\n<Counter\/>\n<Display count={0}\/>\n<Display count={0}\/>\n\n# \u5355\u51fb\u65f6\u7684\u6e32\u67d3\n(\u7a7a\u767d)<\/code><\/pre>\n\n\n\n
        \u5728React\u4e2d\uff0c\u6211\u4eec\u65e0\u6cd5\u505a\u5230\u8fd9\u6837\uff0c\u5f53\u7136\u6211\u4eec\u53ef\u4ee5\u7528useMemo<\/code>\u6765\u4f18\u5316\u6e32\u67d3\u6b21\u6570\u3002<\/p>\n\n\n\n
        export default function Counter() {\n  console. log('<Counter\/>');\n  const [countA, setCountA] = useState (0) ;\n  const [countB, setCountB] = useState (0) ;\n  return ( \n    <div>\n      <button onClick={() => setCountA(countA + 1)]>A<\/button>\n      <button onClick={() => setCountB(countB + 1)}>B<\/button>\n      <MemoDisplay count={countA} \/>\n      <MemoDisplay count={countB} \/>\n    <\/div>\n  );\n}\n\nexport const MemoDisplay = memo (Display);\nexport function Display({ count }: { count: number }) {\n  console. log(`<Display count={${count}}\/>`);\n  return <div>{count}!<\/div>;\n}<\/code><\/pre>\n\n\n\n
        \u5373\u4fbf\u4f18\u5316\u4e4b\u540e\uff0c\u4e5f\u4f1a\u4ea7\u751f\u591a\u6b21\u6e32\u67d3\uff1a<\/p>\n\n\n\n
        # \u521d\u59cb\u6e32\u67d3\u8f93\u51fa\n<Counter\/>\n<Display count={0}\/>\n<Display count={0}\/>\n\n# \u5355\u51fb\u65f6\u7684\u6e32\u67d3\n<Counter\/>\n<Display count={1}\/><\/code><\/pre>\n\n\n\n
        \u56e0\u6b64\uff0c\u5f00\u53d1\u4e5f\u4f1a\u76f8\u5bf9\u6765\u8bf4\u7b80\u5355\u5f88\u591a\uff0c\u4e0d\u7528\u82b1\u8d39\u66f4\u591a\u7684\u65f6\u95f4\u5173\u5fc3\u5982\u4f55\u4f18\u5316\u6e32\u67d3\uff0c\u7814\u7a76\u5982\u4f55\u4f7f\u7528useMemo\uff0cPuerComponent\u7b49\u7b49\u3002<\/p>\n\n\n\n
        \u603b\u7ed3<\/h2>\n\n\n\n
        Signal\u662f\u5e94\u7528\u4e2d\u5b58\u50a8\u72b6\u6001\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u4e0eReact\u7684useState<\/code>\u7c7b\u4f3c\uff0c\u4e24\u8005\u7684\u5173\u952e\u533a\u522b\u5728\u4e8eSignal\u8fd4\u56de\u4e00\u4e2agetter<\/code>\u548c\u4e00\u4e2asetter<\/code>\uff0c\u800cState\u53ea\u8fd4\u56de\u4e00\u4e2a\u503c\u548c\u4e00\u4e2asetter<\/code>\u3002<\/p>\n\n\n\n
        Signal\u662f\u54cd\u5e94\u5f0f\u7684\uff0c\u901a\u8fc7\u8ddf\u8e2a\u8c03\u7528\u5806\u6808\u4e0a\u4e0b\u6587\u5b9e\u73b0\u76f8\u5173\u8ba2\u9605\uff0c\u8fbe\u5230\u5c40\u90e8\u66f4\u65b0\u7684\u76ee\u7684\u3002<\/p>\n\n\n\n
        \u76f8\u6bd4\u4e4b\u4e0b\uff0cReact\u65e0\u6cd5\u53ea\u80fd\u91cd\u65b0\u6e32\u67d3\u6574\u4e2a\u7ec4\u4ef6\u6811\u4ee5\u54cd\u5e94\u72b6\u6001\u53d8\u5316\u3002<\/p>\n\n\n\n
        \u53e6\u5916\uff0cReact\u56e2\u961f\u6210\u5458\u5bf9\u6b64\u7684\u770b\u6cd5\uff1a<\/p>\n\n\n\n
        \"\"<\/a><\/figure>\n\n\n\n
        Rect\u53ef\u80fd\u5f15\u5165\u7c7b\u4f3c\u7684\u539f\u8bed\uff0c\u867d\u7136\u5b83\u6027\u80fd\u5f88\u597d\uff0c\u4f46\u662f\u5e76\u4e0d\u8ba4\u4e3a\u8fd9\u662f\u5199UI\u4ee3\u7801\u7684\u597d\u65b9\u5f0f\uff0cReact\u7684\u76ee\u6807\u662f\u5e0c\u671b\u901a\u8fc7\u7f16\u8bd1\u5668\u6765\u8fbe\u5230\u540c\u7b49\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        Angular\u4ee5\u53caQwik\u7684\u4f5c\u8005MI\u0160KO HEVERY\u5199\u4e86\u7bc7\u6587\u7ae0\uff1auseSignal()\u624d\u662fWeb\u6846\u67b6\u7684\u672a\u6765\uff08useSignal() is the Future of Web Frameworks\uff09\uff0c\u4e5f\u5f15\u8d77\u4e00\u4e9b\u8ba8\u8bba\u3002\u5305\u62ecQwik\u5728\u5185\u7684\u591a\u4e2a\u6846\u67b6\u4e5f\u5df2\u7ecf\u5b9e\u73b0\u4e86useSignal()\uff0c\u8fd9\u4e9b\u6846\u67b6\u8fd8\u6709Vue\u3001Preact\u3001Solid\u4ee5\u53caSvelte\u7b49\u3002 \u5b9e\u9645\u4e0asignals\u5e76\u4e0d\u662f\u4e00\u4e2a\u5168\u65b0\u7684\u6982\u5ff5\uff0c\u5927\u7ea6\u5341\u5e74\u524d\u7684\u6846\u67b6Knockout\u5c31\u66fe\u7ecf\u4f7f\u7528\u8fc7\u3002\u90a3\u4e3a\u4ec0\u4e48\u6700\u8fd1\u7a81\u7136\u53c8\u91cd\u63d0\u6b64\u9879\u6280\u672f\uff1f\u8fd9\u4e3b\u8981\u5f97\u76ca\u4e8e\u5f53\u4eca\u66f4\u52a0\u5148\u8fdb\u7684\u7f16\u8bd1\u6280\u5de7\u4ee5\u53ca\u4e0ejsx\u7684\u6df1\u5ea6\u96c6\u6210\uff0c\u4f7fsignals\u7684\u5f00\u53d1\u4f53\u9a8c\u53d8\u5f97\u66f4\u597d\u4e86\u3002 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