{"id":38052,"date":"2023-10-29T17:20:38","date_gmt":"2023-11-23T02:01:30","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e7%a0%b4%e5%9d%8freact%e5%85%83%e7%b4%a0%e5%88%9b%e5%bb%ba%e8%bf%87%e7%a8%8b%e7%9a%84%e5%90%8c%e6%97%b6%ef%bc%8c%e4%bb%8e%e5%86%85%e9%83%a8%e6%9d%a5%e7%9c%8b\/"},"modified":"2024-05-04T06:34:44","modified_gmt":"2024-05-03T22:34:44","slug":"%e5%9c%a8%e7%a0%b4%e5%9d%8freact%e5%85%83%e7%b4%a0%e5%88%9b%e5%bb%ba%e8%bf%87%e7%a8%8b%e7%9a%84%e5%90%8c%e6%97%b6%ef%bc%8c%e4%bb%8e%e5%86%85%e9%83%a8%e6%9d%a5%e7%9c%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e7%a0%b4%e5%9d%8freact%e5%85%83%e7%b4%a0%e5%88%9b%e5%bb%ba%e8%bf%87%e7%a8%8b%e7%9a%84%e5%90%8c%e6%97%b6%ef%bc%8c%e4%bb%8e%e5%86%85%e9%83%a8%e6%9d%a5%e7%9c%8b\/","title":{"rendered":"\u5728\u7834\u574fReact\u5143\u7d20\u521b\u5efa\u8fc7\u7a0b\u7684\u540c\u65f6\uff0c\u4ece\u5185\u90e8\u6765\u770b"},"content":{"rendered":"
\n

\u8fd9\u7bc7\u6587\u7ae0\u662fBitkey\u516c\u53f82023\u5e74\u5723\u8bde\u8282\u65e5\u5386\u7684\u7b2c13\u7bc7\u6587\u7ae0\u3002<\/p>\n

 <\/p>\n

\u9996\u5148<\/h2>\n

\u4f60\u597d\uff01\u6211\u662f\u5ddd\u53c8\uff0c\u5728Bitkey\u682a\u5f0f\u4f1a\u793e\u62c5\u4efbSET\u3002\u8fd9\u662f\u6211\u7b2c\u4e00\u6b21\u5728Qiita\u4e0a\u5199\u4f5c\uff01\u5728Bitkey\uff0c\u6211\u4eec\u5728\u670d\u52a1\u5f00\u53d1\u4e2d\u4f7f\u7528React\u3002<\/p>\n

\u6211\u4e5f\u662f\uff0c\u76ee\u524d\u5728\u4f7f\u7528React\uff0c\u4f46\u662f\u5982\u679c\u6709\u6ca1\u6709\u78b0\u8fc7\u6216\u8005\u6ca1\u6709\u770b\u8fc7React\u4ee3\u7801\u5e93\u7684\u4eba\uff0c\u8bf7\u52a1\u5fc5\u501f\u6b64\u673a\u4f1a\u4e00\u8d77\u8fdb\u884c\u5b9e\u9645\u64cd\u4f5c\u6765\u4e86\u89e3\u5176\u5185\u90e8\u5b9e\u73b0\u3002<\/p>\n

\n

\u9996\u5148\uff0c\u5c06React\u7684\u4ee3\u7801\u5e93\u514b\u9686\u5230\u672c\u5730\u3002<\/p>\n

git clone https:\/\/github.com\/facebook\/react.git\r\nyarn install\r\n<\/span>git checkout main  #\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306eReact\u306b\u5411\u3051\u307e\u3059<\/span>\r\n<\/code><\/pre>\n
\u4e3a\u4e86\u786e\u8ba4\u5185\u90e8\u5904\u7406\uff0c\u8bf7\u7f16\u5199\u6d4b\u8bd5\u3002
\n\u6211\u6253\u7b97\u5728react-dom\u4e0b\u8fdb\u884c\u7f16\u5199\u3002<\/p>\n
# root\u914d\u4e0b\u306b\u3066<\/span>\r\ntouch <\/span>packages\/react-dom\/src\/__tests__\/ReactHoge-test.js\r\n<\/code><\/pre>\n
\u6211\u6b63\u5728\u53c2\u8003\u73b0\u6709\u7684\u6d4b\u8bd5\u8fdb\u884c\u5b9e\u65bd\uff01<\/div>\n
\u6837\u672c\u6d4b\u8bd5\u5b9e\u65bd<\/p>\n
'<\/span>use strict<\/span>'<\/span>;<\/span>\r\n\r\nlet<\/span> React<\/span>;<\/span>\r\nlet<\/span> ReactDOM<\/span>;<\/span>\r\n\r\ndescribe<\/span>(<\/span>'<\/span>reactdom<\/span>'<\/span>,<\/span> ()<\/span> =><\/span> {<\/span>\r\n  beforeEach<\/span>(()<\/span> =><\/span> {<\/span>\r\n    React<\/span> =<\/span> require<\/span>(<\/span>'<\/span>react<\/span>'<\/span>);<\/span>\r\n    ReactDOM<\/span> =<\/span> require<\/span>(<\/span>'<\/span>react-dom<\/span>'<\/span>);<\/span>\r\n  });<\/span>\r\n  it<\/span>(<\/span>'<\/span>JSX\u3092HTML\u306b\u5909\u63db\u3059\u308b<\/span>'<\/span>,<\/span> ()<\/span> =><\/span> {<\/span>\r\n    \/\/ Arrange<\/span>\r\n    function<\/span> App<\/span>()<\/span> {<\/span>\r\n      return <\/span>(<\/span>\r\n        <<\/span>div<\/span>><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n            <<\/span>div<\/span>><\/span>\r\n              <<\/span>span<\/span>><\/span>hello<\/span><<\/span>\/span<\/span>>\r\n<\/span>            <<\/span>\/div<\/span>>\r\n<\/span>          <<\/span>\/div<\/span>>\r\n<\/span>        <<\/span>\/div<\/span>>\r\n<\/span>      );<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ Act<\/span>\r\n    const<\/span> container<\/span> =<\/span> document<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>div<\/span>'<\/span>);<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>container<\/span>.<\/span>innerHTML<\/span>)<\/span>\r\n    ReactDOM<\/span>.<\/span>render<\/span>(<\/span><<\/span>App<\/span> \/><\/span>,<\/span> container<\/span>);<\/span>\r\n\r\n    \/\/ Assert<\/span>\r\n     expect<\/span>(<\/span>container<\/span>.<\/span>innerHTML<\/span>).<\/span>toBe<\/span>(<\/span>\r\n      '<\/span><div><div><div><span>hello<\/span><\/div><\/div><\/div><\/span>'<\/span>,<\/span>\r\n    );<\/span>\r\n  });<\/span>\r\n});<\/span>\r\n<\/code><\/pre>\n
\u8fdb\u884c\u6d4b\u8bd5<\/p>\n
# root\u914d\u4e0b\u306b\u3066<\/span>\r\nyarn test <\/span>packages\/react-dom\/src\/__tests__\/ReactHoge-test.js\r\n<\/code><\/pre>\n
\u7ed3\u679c<\/p>\n
  console.log\r\n    <div><div><div><span>hello<\/span><\/div><\/div><\/div>\r\n\r\n      at Object.<anonymous> (<\/span>packages\/react-dom\/src\/__tests__\/ReactHoge-test.js:26:13)<\/span>\r\n\r\n PASS  packages\/react-dom\/src\/__tests__\/ReactHoge-test.js\r\n  reactdom\r\n    \u2713 JSX\u304cHTML\u306b\u4ee3\u308f\u308b (<\/span>394 ms)<\/span>\r\n<\/code><\/pre>\n
\u6ca1\u6709\u95ee\u9898\u5730\u5c06\u5b9a\u4e49\u597d\u7684\u7ec4\u4ef6\u6dfb\u52a0\u5230DOM\u4e2d\u3002
\n\u663e\u7136\uff0cDOM\u7684div\u5d4c\u5957\u5f88\u591a\uff0cHTML\u4e0d\u6613\u4e8e\u9605\u8bfb\u3002\u4e3a\u4e86\u6539\u5584\u5916\u89c2\uff0c\u8ba9\u6211\u4eec\u6539\u53d8React\u7684\u884c\u4e3a\uff0c\u5c06<\/p>\n
\n
\u53bb\u6389\u3002<\/p>\n
\u7834\u574fReact\u5143\u7d20\u521b\u5efa\u5904\u7406<\/h2>\n
\u5728\u5b9e\u73b0React\u65f6\uff0c\u4f7f\u7528JSX\u662f\u57fa\u672c\u7684\uff0c\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cJSX\u53ea\u662fJavaScript\u8bed\u6cd5\u7684\u6269\u5c55\uff0c\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5176\u4ed6\u5f62\u5f0f\u6765\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
\u4e3a\u4e86\u77e5\u9053\u5728\u4ee3\u7801\u5e93\u4e2d\u5143\u7d20\u88ab\u521b\u5efa\u7684\u4f4d\u7f6e\uff0c\u9700\u8981\u6df1\u5165\u7406\u89e3JSX\u3002<\/p>\n
\u67e5\u770b\u516c\u5f0f\u6587\u4ef6\u540e\u53d1\u73b0\u6709\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n
 <\/p>\n
\"image.png\"<\/div>\n
\u5728React\u4e2d\uff0c\u4f3c\u4e4e\u662f\u901a\u8fc7createElement\u521b\u5efaReact\u5143\u7d20\u7684\u3002<\/p>\n
\u5728\u4ee3\u7801\u5e93\u4e2d\u8fdb\u884c\u8c03\u67e5\u540e\uff0c\u6211\u4eec\u53d1\u73b0\u4ee5\u4e0b\u5185\u5bb9\u5728packages\/react\/src\/React.js\u4e2d\u5b9a\u4e49\u3002<\/p>\n
const<\/span> createElement<\/span>:<\/span> any<\/span> =<\/span> __DEV__<\/span>\r\n  ?<\/span> createElementWithValidation<\/span>\r\n  :<\/span> createElementProd<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5728\u5b9e\u65bd\u8fc7\u7a0b\u4e2d\uff0c\u6211\u53d1\u73b0\u6709\u4e24\u79cd\u60c5\u51b5\uff0c\u4e00\u79cd\u662f\u8fd0\u884c\u9a8c\u8bc1\uff0c\u53e6\u4e00\u79cd\u662f\u4e0d\u8fd0\u884c\u9a8c\u8bc1\u3002\u4ece\u6027\u80fd\u65b9\u9762\u8003\u8651\uff0c\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u4e0d\u9700\u8981\u8fd0\u884c\u5404\u79cd\u9a8c\u8bc1\u3002\u56e0\u6b64\uff0c\u8ba9\u6211\u4eec\u786e\u8ba4\u4e00\u4e0b\u4e0d\u5e26\u9a8c\u8bc1\u7684createElement\u3002<\/p>\n
\u5728React\u7684\u4ee3\u7801\u5e93\u4e2d\uff0c\u53ef\u4ee5\u7ecf\u5e38\u770b\u5230__DEV__\u6807\u5fd7\u3002\u5f53\u6211\u8fdb\u884cgrep\u64cd\u4f5c\u65f6\uff0c\u53d1\u73b0\u4e86\u6574\u65742254\u6761\u5339\u914d\u9879? \u3002\u63a7\u5236\u53f0\u65e5\u5fd7\u7684\u6709\u65e0\u4ee5\u53ca\u884c\u4e3a\u53d8\u5316\u90fd\u7531\u6b64\u6807\u5fd7\u51b3\u5b9a\u3002<\/div>\n
\u8ba9\u6211\u4eec\u6765\u786e\u8ba4\u4e00\u4e0b\u5b9a\u4e49\u7684\u5148\u9a8c\u6761\u4ef6\u3002<\/p>\n
\/\/ packages\/react\/src\/ReactElement.js<\/span>\r\nexport<\/span> function<\/span> createElement<\/span>(<\/span>type<\/span>,<\/span> config<\/span>,<\/span> children<\/span>)<\/span> {<\/span>\r\n  let<\/span> propName<\/span>;<\/span>\r\n\r\n  \/\/ Reserved names are extracted<\/span>\r\n  const<\/span> props<\/span> =<\/span> {};<\/span>\r\n    ...<\/span>\r\n<\/code><\/pre>\n
createElement\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u4e09\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662ftype\u3001config\u548cchildren\u3002<\/p>\n
\u5728\u6d4b\u8bd5\u4e2d\u5b9a\u4e49\u7684\u7ec4\u4ef6\u4f1a\u88ab\u8f6c\u8bd1\u6210\u4ee5\u4e0b\u7684Javascript\u3002<\/p>\n
React<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>div<\/span>'<\/span>,<\/span> null<\/span>,<\/span>\r\n  React<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>div<\/span>'<\/span>,<\/span> null<\/span>,<\/span>\r\n    React<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>div<\/span>'<\/span>,<\/span> null<\/span>,<\/span>\r\n      React<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>span<\/span>'<\/span>,<\/span> null<\/span>,<\/span> '<\/span>hello<\/span>'<\/span>)<\/span>\r\n    )<\/span>\r\n  )<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5728Chinese\uff0c\u6211\u4eec\u751a\u81f3\u53ef\u4ee5\u4f20\u9012React\u7ec4\u4ef6\u5e76\u4e0d\u9650\u4e8eHTML\u6807\u7b7e\u7684\u7c7b\u578b\u3002<\/p>\n
config\u662f\u4e00\u4e2a\u5bf9\u8c61\uff08props\u7684\u4fe1\u606f\uff09\u6216\u8005\u4e3anull\u3002\u7531\u4e8e\u6b64\u6b21\u6ca1\u6709\u4f20\u9012\u4efb\u4f55\u5185\u5bb9\uff0c\u6240\u4ee5\u4f1a\u53d8\u6210null\u3002<\/p>\n
children\u53ef\u4ee5\u4f20\u9012\u7ed9React\u7684\u8282\u70b9\u7684\u5168\u90e8\u5185\u5bb9\u3002\u672c\u4f8b\u4e2d\u662f\u7531createElement\u8f93\u51fa\u7684React\u5143\u7d20\u3002<\/p>\n
\u53ef\u4ee5\u5c06createElement\u4f5c\u4e3a\u7f16\u5199JSX\u7684\u66ff\u4ee3\u65b9\u6cd5\u5bfc\u5165\u5e76\u5728\u60a8\u7684\u5de5\u4f5c\u9879\u76ee\u4e2d\u4f7f\u7528\uff01\u8bf7\u53c2\u8003\u4ee5\u4e0b\u8be6\u7ec6\u4fe1\u606f\u3002<\/div>\n
\u548cDOM\u4e00\u6837\uff0c\u8c03\u7528\u4e5f\u53d1\u751f\u4e86\u5d4c\u5957?
\n\u6211\u5c06\u66f4\u6539createElement\u7684\u884c\u4e3a\uff0c\u4e0d\u518d\u6e32\u67d3div\u3002
\n\u6839\u636etype\u7684\u5b9a\u4e49\uff0c\u4f3c\u4e4e\u786e\u5b9a\u4e86\u8981\u63d2\u5165\u5230DOM\u4e2d\u7684\u5143\u7d20\u3002
\n\u5982\u679c\u4f20\u9012\u4e86type=’div’\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd4\u56de\u53e6\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n
\/\/ packages\/react\/src\/ReactElement.js<\/span>\r\nexport<\/span> function<\/span> createElement<\/span>(<\/span>type<\/span>,<\/span> config<\/span>,<\/span> children<\/span>)<\/span> {<\/span>\r\n  if <\/span>(<\/span>type<\/span> ===<\/span> '<\/span>div<\/span>'<\/span>)<\/span> {<\/span>\r\n    type<\/span> =<\/span> '<\/span>hoge<\/span>'<\/span>;<\/span>\r\n  }<\/span> \/\/ if\u6587\u3092\u8ffd\u52a0<\/span>\r\n  \r\n  let<\/span> propName<\/span>;<\/span>\r\n  ...<\/span>\r\n<\/code><\/pre>\n
\u6211\u5c06\u518d\u6b21\u8fdb\u884c\u6d4b\u8bd5\u3002<\/p>\n
\u6211\u73b0\u5728\u5f00\u59cb\u53d1\u51fa\u4ee5\u4e0b\u8b66\u544a<\/p>\n
    Warning: The tag <hoge> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.\r\n        at hoge\r\n        at hoge\r\n        at hoge\r\n        at App\r\n<\/code><\/pre>\n
\u5728HTML\u4e2d\u5e76\u4e0d\u5b58\u5728\u8fd9\u4e2a\u6807\u7b7e\uff0c\u6240\u4ee5\u4ea7\u751f\u8b66\u544a\u662f\u7406\u6240\u5f53\u7136\u7684\u3002
\n\u4e0d\u8fc7\u6709\u8da3\u7684\u662f\uff0c<\/p>\n
  \u25cf reactdom \u203a JSX\u304cHTML\u306b\u4ee3\u308f\u308b\r\n\r\n    expect(received).toBe(expected) \/\/ Object.is equality\r\n\r\n    Expected: \"<div><div><div><span>hello<\/span><\/div><\/div><\/div>\"\r\n    Received: \"<hoge><hoge><hoge><span>hello<\/span><\/hoge><\/hoge><\/hoge>\"\r\n<\/code><\/pre>\n
\u88ab\u6807\u7b7e\u66ff\u4ee3\u4e86?
\n\u6211\u4eec\u6210\u529f\u53bb\u9664\u4e86div\u6807\u7b7e\uff0c\u4f46\u662f\u9700\u8981\u786e\u4fdd\u5b83\u80fd\u6b63\u5e38\u8fd0\u884c\u3002<\/div>\n
\u65e0\u9700\u4efb\u4f55\u5185\u5bb9\u5373\u53ef\u6b63\u5e38\u5448\u73b0<\/h3>\n
\u8ba9\u6211\u4eec\u6dfb\u52a0\u4e00\u573a\u6d4b\u8bd5\u5427\u3002<\/p>\n
\u76ee\u6807\u5c31\u53ea\u5269\u4e0bhello\u4e86\uff0c\u5bf9\u5427\u3002<\/p>\n
it<\/span>(<\/span>'<\/span>div\u3092\u7121\u304f\u305b\u308b<\/span>'<\/span>,<\/span> ()<\/span> =><\/span> {<\/span>\r\n    \/\/ Arrange<\/span>\r\n    function<\/span> App<\/span>()<\/span> {<\/span>\r\n      return <\/span>(<\/span>\r\n        <<\/span>div<\/span>><\/span>\r\n          <<\/span>div<\/span>><\/span>\r\n            <<\/span>div<\/span>><\/span>\r\n              <<\/span>span<\/span>><\/span>hello<\/span><<\/span>\/span<\/span>>\r\n<\/span>            <<\/span>\/div<\/span>>\r\n<\/span>          <<\/span>\/div<\/span>>\r\n<\/span>        <<\/span>\/div<\/span>>\r\n<\/span>      );<\/span>\r\n    }<\/span>\r\n    \/\/ Act<\/span>\r\n    const<\/span> container<\/span> =<\/span> document<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>div<\/span>'<\/span>);<\/span>\r\n    ReactDOM<\/span>.<\/span>render<\/span>(<\/span><<\/span>App<\/span> \/><\/span>,<\/span> container<\/span>);<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>container<\/span>.<\/span>innerHTML<\/span>)<\/span>\r\n\r\n    \/\/Assert<\/span>\r\n    expect<\/span>(<\/span>container<\/span>.<\/span>innerHTML<\/span>).<\/span>toBe<\/span>(<\/span>'<\/span><span>hello<\/span><\/span>'<\/span>);<\/span>\r\n  });<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u901a\u8fc7\u5c06\u5e38\u89c1\u7684\u7247\u6bb5\u66ff\u6362\u6765\u5b9e\u73b0\u4e0d\u4f7f\u7528div\u8fdb\u884c\u6b63\u5e38\u6e32\u67d3\u3002<\/p>\n
\u5982\u679c\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u5b9a\u4e49\uff0c\u7531\u4e8e\u4e0d\u5b58\u5728\u4e0e”hohe”\u76f8\u540c\u7684”fragment”\u6807\u7b7e\uff0c\u56e0\u6b64\u53ef\u80fd\u4f1a\u53d7\u5230\u6279\u8bc4\u3002<\/p>\n
\/\/ packages\/react\/src\/ReactElement.js<\/span>\r\nexport<\/span> function<\/span> createElement<\/span>(<\/span>type<\/span>,<\/span> config<\/span>,<\/span> children<\/span>)<\/span> {<\/span>\r\nif <\/span>(<\/span>type<\/span> ===<\/span> '<\/span>div<\/span>'<\/span>)<\/span> {<\/span>\r\n    type<\/span> =<\/span> '<\/span>fragment<\/span>'<\/span>;<\/span>\r\n  }<\/span>\r\n  \r\n  let<\/span> propName<\/span>;<\/span>\r\n  ...<\/span>\r\n\r\n\/\/ Warning: The tag <fragment> is unrecognized in this browser<\/span>\r\n<\/code><\/pre>\n
\u901a\u5e38\u5728JSX\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 <> <\/> \u7684\u5f62\u5f0f\u6765\u7f16\u5199Fragment\u3002\u4f46\u662f\u5982\u679c\u8981\u5728\u5185\u90e8\u8fdb\u884c\u66ff\u6362\uff0c\u5e94\u8be5\u4f20\u9012\u8f6c\u8bd1\u540e\u7684\u7c7b\u578b\u3002\u8ba9\u6211\u4eec\u5728\u4ee3\u7801\u5e93\u5185\u5f15\u7528Fragment\u3002<\/p>\n
\u8ba9\u6211\u4eec\u4ee5Babel\u63d0\u4f9b\u7684\u7f16\u8bd1\u5668\u6f14\u793a\u6765\u67e5\u770bJSX\u7684React\u7247\u6bb5\u4f1a\u4ee5\u54ea\u79cd\u5f62\u5f0f\u7f16\u8bd1\u3002<\/p>\n
\"image.png\"<\/div>\n
\u7ecf\u8fc7\u7f16\u8bd1\uff0c\u7b80\u5355\u7684 JSX \u5df2\u88ab\u8f6c\u6362\u3002\u7531\u4e8e Fragment \u88ab\u8c03\u7528\u5230 createElement \u4e2d\uff0c\u6211\u4eec\u9700\u8981\u67e5\u770b\u5bfc\u5165\u7684 react\/jsx-runtime \u7684\u5185\u5bb9\u3002<\/p>\n
\u5305\/packages\/react\/jsx-runtime.js<\/p>\n
export<\/span> {<\/span>Fragment<\/span>,<\/span> jsx<\/span>,<\/span> jsxs<\/span>}<\/span> from<\/span> '<\/span>.\/src\/jsx\/ReactJSX<\/span>'<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u6211\u8bd5\u56fe\u8ddf\u7740 Fragment \u7684\u5b9a\u4e49\u8df3\u8f6c\uff0c\u6700\u7ec8\u5230\u8fbe\u4e86 ReactSymbols.js\u3002
\n\u770b\u8d77\u6765\uff0c\u6240\u6709 React \u5143\u7d20\u7684\u7c7b\u578b\u90fd\u5728\u8fd9\u91cc\u5b9a\u4e49?\u3002<\/p>\n
\u901a\u8fc7\u5728Symbol\u4e2d\u8fdb\u884c\u5b9a\u4e49\uff0cReact\u5143\u7d20\u7684\u6807\u7b7e\u5728\u4efb\u4f55\u73af\u5883\u4e0b\u90fd\u4f1a\u8fd4\u56de\u552f\u4e00\u7684\u503c\uff0c\u4e14\u4fdd\u6301\u4e0d\u53ef\u53d8\u6027\u3002<\/div>\n
\u8ba9\u6211\u4eec\u5c06\u76f8\u5e94\u7684\u7c7b\u578b\u5b9a\u4e49\u5b9a\u4e49\u5728createElement\u51fd\u6570\u4e2d\u3002<\/p>\n
import<\/span> {<\/span>REACT_FRAGMENT_TYPE<\/span>}<\/span> from<\/span> '<\/span>shared\/ReactSymbols<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> function<\/span> createElement<\/span>(<\/span>type<\/span>,<\/span> config<\/span>,<\/span> children<\/span>)<\/span> {<\/span>\r\n  if <\/span>(<\/span>type<\/span> ===<\/span> '<\/span>div<\/span>'<\/span>)<\/span> {<\/span>\r\n    type<\/span> =<\/span> REACT_FRAGMENT_TYPE<\/span>;<\/span>\r\n  }<\/span>\r\n  \r\n  let<\/span> propName<\/span>;<\/span>\r\n  ...<\/span>\r\n<\/code><\/pre>\n
\u8fdb\u884c\u6d4b\u8bd5<\/p>\n
 console.log\r\n    <span>hello<\/span>\r\n\r\n      at Object.<anonymous> (<\/span>packages\/react-dom\/src\/__tests__\/ReactHoge-test.js:45:13)<\/span>\r\n\r\n PASS  packages\/react-dom\/src\/__tests__\/ReactHoge-test.js\r\n  reactdom\r\n    \u2713 div\u3092\u7121\u304f\u305b\u308b (<\/span>134 ms)<\/span>\r\n<\/code><\/pre>\n
\u6e32\u67d3\u65f6\u6210\u529f\u5730\u5220\u9664\u4e86div\u7684\u6240\u6709\u5185\u5bb9?<\/p>\n
\u7d50\u5c40<\/h2>\n
\u9019\u6b21\u6211\u5011\u4f7f\u7528\u5be6\u4f5c\u5f0f\u7684\u65b9\u5f0f\u4f86\u770bReact\u5143\u7d20\u7684\u5efa\u7acb\u904e\u7a0b\u3002
\ncreateElement\u53ea\u662fReact UI\u67b6\u69cb\u4e2d\u7684\u4e00\u500b\u968e\u6bb5\u800c\u5df2\u3002\u9084\u6709\u5f8c\u7e8c\u7684\u8655\u7406\uff0c\u50cf\u662f\u8abf\u548c\uff08React Fiber\uff09\u3001\u639b\u8f09DOM\u3001\u72c0\u614b\u548c\u751f\u547d\u5468\u671f\u7b49\u8a71\u984c\u3002\u6211\u5011\u53ef\u4ee5\u5728\u76f8\u61c9\u7684\u51fd\u6578\u4e2d\u52a0\u5165console log\uff0c\u6216\u6539\u8b8a\u884c\u70ba\uff0c\u540c\u6642\u73a9\u8457React\u7684\u5167\u90e8\u5be6\u73fe\uff0c\u4e00\u8d77\u5b78\u7fd2\u5427\uff01<\/p>\n
\n
2023 \u5e74\u7684\u7b2c 14 \u5929\uff0c\u682a\u5f0f\u4f1a\u793e BitKey \u7684 Advent Calendar \u5c06\u7531 @takumi_sakao \u8d1f\u8d23\uff01\u656c\u8bf7\u671f\u5f85\u2728<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
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