{"id":5975,"date":"2023-01-06T15:50:46","date_gmt":"2023-01-06T07:50:46","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=5975"},"modified":"2023-01-06T15:50:46","modified_gmt":"2023-01-06T07:50:46","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8react%e4%b8%ad%e7%9a%84uselayouteffect%e9%80%b2%e8%a1%8c%e5%b8%83%e5%b1%80%e5%84%aa%e5%8c%96%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%84uselayouteffect%e9%80%b2%e8%a1%8c%e5%b8%83%e5%b1%80%e5%84%aa%e5%8c%96%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528React\u4e2d\u7684useLayoutEffect\u9032\u884c\u5e03\u5c40\u512a\u5316\uff1f"},"content":{"rendered":"

<\/p>\n

\u5982\u4f55\u5728 React \u4e2d\u4f7f\u7528 useLayoutEffect \u8fdb\u884c\u5e03\u5c40\u4f18\u5316\uff1f<\/h1>\n

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 \u4e2d\u7684 useLayoutEffect \u53ef\u4ee5\u7528\u65bc\u9032\u884c\u5e03\u5c40\u512a\u5316\uff0c\u4ee5\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002<\/p>\n

<\/p>\n

\u4ec0\u9ebc\u662f useLayoutEffect\uff1f<\/h2>\n

useLayoutEffect \u662f React \u4e2d\u7684\u4e00\u500b\u9264\u5b50\uff0c\u5b83\u53ef\u4ee5\u5728\u6bcf\u6b21\u6e32\u67d3\u5f8c\u7acb\u5373\u57f7\u884c\uff0c\u4e26\u5728\u700f\u89bd\u5668\u66f4\u65b0 DOM \u4e4b\u524d\u57f7\u884c\u6e05\u7406\u5de5\u4f5c\u3002\u5b83\u53ef\u4ee5\u7528\u65bc\u66f4\u65b0 DOM \u5143\u7d20\u7684\u4f4d\u7f6e\u548c\u5927\u5c0f\uff0c\u4ee5\u53ca\u66f4\u65b0\u5176\u4ed6\u53ef\u80fd\u5f71\u97ff\u5e03\u5c40\u7684\u5c6c\u6027\u3002<\/p>\n

\u4f7f\u7528 useLayoutEffect \u9032\u884c\u5e03\u5c40\u512a\u5316<\/h2>\n

\u4f7f\u7528 useLayoutEffect \u9032\u884c\u5e03\u5c40\u512a\u5316\u7684\u6700\u4f73\u5be6\u8e10\u662f\uff0c\u5728\u6bcf\u6b21\u6e32\u67d3\u5f8c\u7acb\u5373\u66f4\u65b0 DOM \u5143\u7d20\u7684\u4f4d\u7f6e\u548c\u5927\u5c0f\uff0c\u4ee5\u53ca\u66f4\u65b0\u5176\u4ed6\u53ef\u80fd\u5f71\u97ff\u5e03\u5c40\u7684\u5c6c\u6027\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u700f\u89bd\u5668\u5728\u66f4\u65b0 DOM \u4e4b\u524d\u5c31\u5df2\u7d93\u66f4\u65b0\u4e86\u5e03\u5c40\uff0c\u4ee5\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002<\/p>\n

\u793a\u4f8b<\/h2>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 useLayoutEffect \u9032\u884c\u5e03\u5c40\u512a\u5316\u7684\u793a\u4f8b\uff1a<\/p>\n

\nimport React, { useLayoutEffect } from 'react';\n\nconst MyComponent = () => {\n  const [width, setWidth] = useState(0);\n\n  useLayoutEffect(() => {\n    const element = document.getElementById('my-element');\n    setWidth(element.offsetWidth);\n  }, [width]);\n\n  return (\n    
\n      The width of this element is {width}px.\n    <\/div>\n  );\n};\n<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 useLayoutEffect \u9264\u5b50\u4f86\u66f4\u65b0 DOM \u5143\u7d20\u7684\u5bec\u5ea6\uff0c\u4e26\u5c07\u5176\u5b58\u5132\u5728 state \u4e2d\u3002\u9019\u6a23\uff0c\u6bcf\u6b21\u6e32\u67d3\u5f8c\uff0cDOM \u5143\u7d20\u7684\u5bec\u5ea6\u5c31\u6703\u88ab\u66f4\u65b0\uff0c\u800c\u4e0d\u6703\u7b49\u5230\u700f\u89bd\u5668\u66f4\u65b0 DOM \u4e4b\u524d\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
React \u4e2d\u7684 useLayoutEffect \u53ef\u4ee5\u7528\u65bc\u9032\u884c\u5e03\u5c40\u512a\u5316\uff0c\u4ee5\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002\u5b83\u53ef\u4ee5\u5728\u6bcf\u6b21\u6e32\u67d3\u5f8c\u7acb\u5373\u57f7\u884c\uff0c\u4e26\u5728\u700f\u89bd\u5668\u66f4\u65b0 DOM \u4e4b\u524d\u57f7\u884c\u6e05\u7406\u5de5\u4f5c\u3002\u4f7f\u7528 useLayoutEffect \u9032\u884c\u5e03\u5c40\u512a\u5316\u7684\u6700\u4f73\u5be6\u8e10\u662f\uff0c\u5728\u6bcf\u6b21\u6e32\u67d3\u5f8c\u7acb\u5373\u66f4\u65b0 DOM \u5143\u7d20\u7684\u4f4d\u7f6e\u548c\u5927\u5c0f\uff0c\u4ee5\u53ca\u66f4\u65b0\u5176\u4ed6\u53ef\u80fd\u5f71\u97ff\u5e03\u5c40\u7684\u5c6c\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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