{"id":5967,"date":"2023-01-06T15:49:00","date_gmt":"2023-01-06T07:49:00","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=5967"},"modified":"2023-01-06T15:49:00","modified_gmt":"2023-01-06T07:49:00","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8react%e4%b8%ad%e7%9a%84useimperativehandle%e9%80%b2%e8%a1%8c%e7%b5%84%e4%bb%b6%e9%96%93%e7%9a%84%e6%8e%a5%e5%8f%a3%e8%aa%bf%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/react-js\/%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8react%e4%b8%ad%e7%9a%84useimperativehandle%e9%80%b2%e8%a1%8c%e7%b5%84%e4%bb%b6%e9%96%93%e7%9a%84%e6%8e%a5%e5%8f%a3%e8%aa%bf%e7%94%a8%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528React\u4e2d\u7684useImperativeHandle\u9032\u884c\u7d44\u4ef6\u9593\u7684\u63a5\u53e3\u8abf\u7528\uff1f"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"React, useImperativeHandle, \u7ec4\u4ef6\u95f4\u63a5\u53e3\u8c03\u7528\"><\/p>\n<h1>\u5982\u4f55\u5728 React \u4e2d\u4f7f\u7528 useImperativeHandle \u8fdb\u884c\u7ec4\u4ef6\u95f4\u7684\u63a5\u53e3\u8c03\u7528\uff1f<\/h1>\n<p>React \u662f\u4e00\u500b\u7528\u65bc\u69cb\u5efa\u7528\u6236\u754c\u9762\u7684 JavaScript \u5eab\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u8f15\u9b06\u5730\u69cb\u5efa\u9ad8\u6027\u80fd\u7684\u7db2\u9801\u61c9\u7528\u7a0b\u5e8f\u3002React \u63d0\u4f9b\u4e86\u4e00\u7a2e\u53eb\u505a useImperativeHandle \u7684 API\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728 React \u7d44\u4ef6\u4e4b\u9593\u9032\u884c\u63a5\u53e3\u8c03\u7528\u3002<\/p>\n<p>useImperativeHandle \u662f\u4e00\u500b React Hook\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5c07\u7d44\u4ef6\u7684\u5be6\u4f8b\u4f5c\u70ba\u53c3\u6578\u50b3\u905e\u7d66\u53e6\u4e00\u500b\u7d44\u4ef6\uff0c\u4ee5\u4fbf\u5728\u5169\u500b\u7d44\u4ef6\u4e4b\u9593\u9032\u884c\u63a5\u53e3\u8c03\u7528\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5c07\u7d44\u4ef6\u7684\u5be6\u4f8b\u4f5c\u70ba\u53c3\u6578\u50b3\u905e\u7d66\u53e6\u4e00\u500b\u7d44\u4ef6\uff0c\u4ee5\u4fbf\u5728\u5169\u500b\u7d44\u4ef6\u4e4b\u9593\u9032\u884c\u63a5\u53e3\u8c03\u7528\u3002<\/p>\n<p>\u4f7f\u7528 useImperativeHandle \u7684\u65b9\u6cd5\u975e\u5e38\u7c21\u55ae\uff0c\u53ea\u9700\u8981\u5728\u7d44\u4ef6\u7684\u69cb\u9020\u51fd\u6578\u4e2d\u5b9a\u7fa9\u4e00\u500b useImperativeHandle \u51fd\u6578\uff0c\u4e26\u5c07\u7d44\u4ef6\u7684\u5be6\u4f8b\u4f5c\u70ba\u53c3\u6578\u50b3\u905e\u7d66\u5b83\u3002<\/p>\n<pre class=\"brush: javascript\">\nfunction MyComponent(props) {\n  const [state, setState] = useState(initialState);\n  const instance = useRef(null);\n\n  useImperativeHandle(instance, () => ({\n    doSomething() {\n      \/\/ do something with state\n    }\n  }));\n\n  return (\n    <div ref={instance}>\n      {\/* ... *\/}\n    <\/div>\n  );\n}\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b useImperativeHandle \u51fd\u6578\uff0c\u4e26\u5c07\u7d44\u4ef6\u7684\u5be6\u4f8b\u4f5c\u70ba\u53c3\u6578\u50b3\u905e\u7d66\u5b83\u3002\u5728\u51fd\u6578\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u5b9a\u7fa9\u4e00\u500b doSomething \u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u8a2a\u554f\u7d44\u4ef6\u7684 state\uff0c\u4ee5\u4fbf\u5728\u5169\u500b\u7d44\u4ef6\u4e4b\u9593\u9032\u884c\u63a5\u53e3\u8c03\u7528\u3002<\/p>\n<p>\u4f7f\u7528 useImperativeHandle \u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728 React \u7d44\u4ef6\u4e4b\u9593\u9032\u884c\u63a5\u53e3\u8c03\u7528\uff0c\u800c\u4e0d\u9700\u8981\u4f7f\u7528\u5168\u5c40\u53c3\u6578\u6216\u8005\u5176\u4ed6\u985e\u4f3c\u7684\u6280\u8853\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u8f15\u9b06\u5730\u5728 React \u7d44\u4ef6\u4e4b\u9593\u9032\u884c\u63a5\u53e3\u8c03\u7528\uff0c\u4e26\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n<p><!--more--><\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p>React \u63d0\u4f9b\u4e86\u4e00\u7a2e\u53eb\u505a useImperativeHandle \u7684 API\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728 React \u7d44\u4ef6\u4e4b\u9593\u9032\u884c\u63a5\u53e3\u8c03\u7528\u3002\u4f7f\u7528 useImperativeHandle \u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728 React 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