{"id":38040,"date":"2022-12-27T16:39:13","date_gmt":"2022-11-10T16:50:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8react%e4%b8%ad%ef%bc%8c%e4%b8%89%e5%85%83%e8%bf%90%e7%ae%97%e7%ac%a6%e5%92%8c%e9%80%bb%e8%be%91%e8%bf%90%e7%ae%97%e7%ac%a6%e5%af%b9%e5%be%85state%e7%9a%84%e6%96%b9%e5%bc%8f%e6%9c%89%e4%bd%95\/"},"modified":"2024-04-29T07:13:00","modified_gmt":"2024-04-28T23:13:00","slug":"%e5%9c%a8react%e4%b8%ad%ef%bc%8c%e4%b8%89%e5%85%83%e8%bf%90%e7%ae%97%e7%ac%a6%e5%92%8c%e9%80%bb%e8%be%91%e8%bf%90%e7%ae%97%e7%ac%a6%e5%af%b9%e5%be%85state%e7%9a%84%e6%96%b9%e5%bc%8f%e6%9c%89%e4%bd%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8react%e4%b8%ad%ef%bc%8c%e4%b8%89%e5%85%83%e8%bf%90%e7%ae%97%e7%ac%a6%e5%92%8c%e9%80%bb%e8%be%91%e8%bf%90%e7%ae%97%e7%ac%a6%e5%af%b9%e5%be%85state%e7%9a%84%e6%96%b9%e5%bc%8f%e6%9c%89%e4%bd%95\/","title":{"rendered":"\u5728React\u4e2d\uff0c\u4e09\u5143\u8fd0\u7b97\u7b26\u548c\u903b\u8f91\u8fd0\u7b97\u7b26\u5bf9\u5f85state\u7684\u65b9\u5f0f\u6709\u4f55\u4e0d\u540c\uff1f"},"content":{"rendered":"

\u9996\u5148<\/h2>\n

React\u7684\u6587\u6863\u4e0d\u4ec5\u4f5c\u4e3a\u5165\u95e8\u4e66\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u6709\u4e00\u5b9a\u4e86\u89e3\u7684\u4eba\u6765\u8bf4\uff0c\u4e5f\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u7f51\u7ad9\u6765\u52a0\u6df1\u5bf9React\u7684\u7406\u89e3\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u516c\u53f8\u5185\u90e8\u4ee5\u5fd7\u613f\u8005\u7684\u5f62\u5f0f\u6bcf\u5468\u4e3e\u884c\u8bfb\u4e66\u4f1a\u6765\u4ea4\u6d41\u548c\u8ba8\u8bba\u3002<\/p>\n

\u7531\u4e8e\u5bf9\u9605\u8bfb\u4e86\u201c\u72b6\u6001\u7684\u4fdd\u6301\u548c\u91cd\u7f6e\u201d\u9875\u9762\u7684\u4f1a\u8bae\u4e0a\u5f15\u53d1\u7684\u7591\u95ee\u611f\u5230\u5f88\u6709\u5174\u8da3\uff0c\u672c\u6587\u6210\u4e3a\u4e86\u5173\u4e8e\u8ffd\u6c42\u8be5\u95ee\u9898\u7684\u6587\u7ae0\u3002<\/p>\n

 <\/p>\n

\u6000\u7591<\/h2>\n

\u4e3a\u4ec0\u4e48\u5f53\u4f7f\u7528\u4e09\u5143\u8fd0\u7b97\u7b26\u6765\u5206\u53c9Counter\u5e76\u4f7f\u7528\u76f8\u540c\u7684\u8f93\u51faDOM\u65f6\uff0c\u5b83\u4f1a\u4fdd\u6301\u72b6\u6001\uff0c\u4f46\u5f53\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\u6765\u8868\u793a\u65f6\uff0c\u5b83\u5374\u4e0d\u4fdd\u6301\u72b6\u6001\uff1f<\/p>\n

\u4e09\u4e2a\u8fd0\u7b97\u7b26\u7684\u4f8b\u5b50<\/h3>\n
\/\/ isFancy\u3092\u5207\u308a\u66ff\u3048\u3066\u3082Counter\u306e\u5024\u304c\u4fdd\u6301\u3055\u308c\u308b<\/span>\r\n<<\/span>div<\/span>><\/span>\r\n  {<\/span>isFancy<\/span> ?<\/span> (<\/span>\r\n    <<\/span>Counter<\/span> isFancy<\/span>=<\/span>{<\/span>true<\/span>}<\/span> \/><\/span> \r\n  )<\/span> :<\/span> (<\/span>\r\n    <<\/span>Counter<\/span> isFancy<\/span>=<\/span>{<\/span>false<\/span>}<\/span> \/><\/span>\r\n  )<\/span>}<\/span>\r\n<\/<\/span>div<\/span>><\/span>\r\n<\/code><\/pre>\n
 <\/p>\n
\u8ad6\u7406\u904b\u7b97\u7b26\u7684\u4f8b\u5b50<\/h3>\n
\/\/ isFancy\u3092\u5207\u308a\u66ff\u3048\u308b\u3068Counter\u306e\u5024\u304c\u30ea\u30bb\u30c3\u30c8\u3055\u308c\u308b<\/span>\r\n<<\/span>div<\/span>><\/span>\r\n  {<\/span>isFancy<\/span> &&<\/span> (<\/span>\r\n    <<\/span>Counter<\/span> isFancy<\/span>=<\/span>{<\/span>true<\/span>}<\/span> \/><\/span> \r\n  )<\/span>}<\/span>\r\n  {<\/span>!<\/span>isFancy<\/span> &&<\/span> (<\/span>\r\n    <<\/span>Counter<\/span> isFancy<\/span>=<\/span>{<\/span>false<\/span>}<\/span> \/><\/span>\r\n  )<\/span>}<\/span>\r\n<\/<\/span>div<\/span>><\/span>\r\n<\/code><\/pre>\n
 <\/p>\n
\u56de\u987e\u6587\u4ef6<\/h3>\n
\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u56de\u987e\u4e00\u4e0b\u6587\u6863\u7684\u5185\u5bb9\u3002
\n\u9996\u5148\u662f\u5173\u4e8e\u5c06React\u7ec4\u4ef6\u4f20\u9012\u7ed9\u6d4f\u89c8\u5668DOM\u7684\u65b9\u6cd5\u3002<\/p>\n
React \u5728\u7ba1\u7406\u548c\u5efa\u6a21\u7528\u6237\u521b\u5efa\u7684 UI \u65b9\u9762\u4f7f\u7528\u6811\u7ed3\u6784\u3002React \u4ece JSX \u4e2d\u521b\u5efa UI \u6811\u3002\u7136\u540e\uff0cReact DOM \u6839\u636e\u8fd9\u4e2a UI \u6811\u66f4\u65b0\u6d4f\u89c8\u5668\u7684 DOM \u5143\u7d20\u3002\uff08\u5bf9\u4e8e React Native\uff0c\u5b83\u5c06 UI \u6811\u8f6c\u6362\u4e3a\u79fb\u52a8\u5e73\u53f0\u7279\u5b9a\u7684\u5143\u7d20\u3002\uff09<\/p><\/blockquote>\n
\u4e0b\u9762\u662f\u5173\u4e8e\u66f4\u65b0state\u7684\u65b9\u6cd5\u3002<\/p>\n
\u5f53\u7ec4\u4ef6\u5728 UI \u6811\u4e2d\u6301\u7eed\u6e32\u67d3\u65f6\uff0cReact \u4f1a\u4fdd\u6301\u8be5\u7ec4\u4ef6\u7684\u72b6\u6001\u3002<\/p><\/blockquote>\n
\u56e0\u6b64\uff0c\u5728\u8fd9\u91cc\u83b7\u5f97\u7684\u77e5\u8bc6\u4ec5\u4ec5\u662f\u65e0\u6cd5\u7406\u89e3UI\u6811\u662f\u4ec0\u4e48\u4ee5\u53ca\u5982\u4f55\u6784\u5efa\u5b83\uff0c\u6240\u4ee5\u81ea\u7136\u800c\u7136\u5730\u5e94\u8be5\u8003\u8651\u5230JSX\u548c\u57fa\u4e8e\u5b83\u6784\u5efa\u7684DOM\u6811\uff0c\u5e76\u7814\u7a76\u5982\u4f55\u7ef4\u62a4\u72b6\u6001\u3002
\n\u5728\u8fd9\u4e2a\u524d\u63d0\u4e0b\u8003\u8651\uff0c\u8fd9\u4e2a\u7591\u95ee\u662f\u5408\u7406\u7684\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u89e3\u91ca\u8bf4\uff1a”\u4e0eDOM\u6811\u4e0d\u540c\uff0cUI\u6811\u51b3\u5b9a\u72b6\u6001\u7684\u7ef4\u62a4\u3002\u7531\u4e8eUI\u6811\u8fd8\u5305\u542b\u4e00\u4e9b\u4e0d\u4f1a\u51fa\u73b0\u5728DOM\u6811\u4e2d\u7684\u4fe1\u606f\uff0c\u6bd4\u5982false\u6216null\uff0c\u56e0\u6b64\u524d\u8005\u4f1a\u4fdd\u7559\u72b6\u6001\uff0c\u800c\u540e\u8005\u5219\u4e0d\u4f1a\u4fdd\u7559\u3002”\u3002\u7136\u800c\uff0c\u6211\u6ca1\u6709\u89e3\u91caUI\u6811\u662f\u4ec0\u4e48\uff0c\u56e0\u6b64\u56de\u7b54\u5e76\u4e0d\u5b8c\u6574\u3002<\/p>\n
\u56e0\u6b64\uff0c\u672c\u6587\u5c06\u9610\u8ff0\u4ec0\u4e48\u662fUI\u6811\uff0c\u4ee5\u53ca\u5b83\u662f\u5982\u4f55\u6784\u5efa\u7684\uff0c\u4ee5\u6d88\u9664\u8fd9\u79cd\u6a21\u7cca\u4e0d\u6e05\u3002<\/p>\n
\u5173\u4e8eUI\u6811\u7684\u5185\u5bb9<\/h2>\n
UI\u6811\u662f\u5728\u4f20\u9012JSX\u65f6\uff0cReact\u5c06\u5176\u8f6c\u6362\u4e3aReact DOM\u53ef\u4ee5\u8f7b\u677e\u5904\u7406\u7684\u5f62\u5f0f\u7684\u7ed3\u6784\uff08React DOM\u7684\u90e8\u5206\u4e5f\u53ef\u4ee5\u66ff\u6362\u4e3aReact Native\uff09\u3002
\n\u4e3a\u4e86\u786e\u5b9aUI\u6811\u6307\u7684\u662f\u4ec0\u4e48\uff0c\u6211\u4eec\u5173\u6ce8React DOM\u4f5c\u4e3aReact\u7ec4\u4ef6\u5904\u7406\u65b9\u6cd5\u4e4b\u4e00\u7684createRoot\u3002\u5e38\u89c1\u7684\u5199\u6cd5\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
ReactDOM<\/span>.<\/span>createRoot<\/span>(<\/span>document<\/span>.<\/span>getElementById<\/span>(<\/span>'<\/span>root<\/span>'<\/span>)).<\/span>render<\/span>(<\/span>\r\n  <<\/span>React<\/span>.<\/span>StrictMode<\/span>><\/span>\r\n    <<\/span>App<\/span> \/><\/span>\r\n  <\/<\/span>React<\/span>.<\/span>StrictMode<\/span>>,<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
render\u7684\u90e8\u5206\u662f\u4f20\u9012JSX\u7684\u5730\u65b9\u3002\u7531\u4e8e\u76f4\u63a5\u4f20\u9012JSX\uff0c\u6240\u4ee5React\u6ca1\u6709\u5904\u7406\u5c06JSX\u8f6c\u6362\u4e3aUI\u6811\u7684\u8fc7\u7a0b\u3002<\/p>\n
\u56e0\u6b64\u6211\u4eec\u6765\u8003\u8651\u4e00\u4e0bJSX\u3002JSX\u662fJavaScript\u7684\u6269\u5c55\u8bed\u6cd5\uff0c\u5728\u8fd0\u884c\u65f6\u4f7f\u7528SWC\u6216ESBuild\u7b49\u5de5\u5177\u5c06\u5176\u8f6c\u8bd1\u4e3a\u6d4f\u89c8\u5668\u53ef\u5904\u7406\u7684JavaScript\u683c\u5f0f\u3002<\/p>\n
\u6839\u636eESBuild\u7684\u6587\u6863\u8fdb\u884c\u4ee3\u7801\u8f6c\u6362\uff0c<\/p>\n
import<\/span> React<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nlet<\/span> button<\/span> =<\/span> <<\/span>button<\/span>><\/span>Click me<\/<\/span>button<\/span>><\/span>\r\nrender<\/span>(<\/span>button<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u7684\u4ee3\u78bc\u4f7f\u7528\u4e86React.createElement\uff0c\u8f49\u63db\u6210\u4e0b\u9762\u7684\u4ee3\u78bc\u5982\u4e0b\u3002<\/p>\n
import<\/span> React<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nlet<\/span> button<\/span> =<\/span> React<\/span>.<\/span>createElement<\/span>(<\/span>'<\/span>button<\/span>'<\/span>,<\/span> null<\/span>,<\/span> \"<\/span>Click me<\/span>\"<\/span>);<\/span>\r\nrender<\/span>(<\/span>button<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6362\u53e5\u8bdd\u8bf4\uff0cJSX\u88ab\u9690\u85cf\u5728\u8f6c\u8bd1\u8fc7\u7a0b\u4e2d\uff0c\u901a\u8fc7\u4f7f\u7528React\u7684createElement\u65b9\u6cd5\u5c06\u5176\u8f6c\u6362\u4e3a\u4fbf\u4e8eReact DOM\u5904\u7406\u7684\u5f62\u5f0f\u3002
\nESBuild\u7684\u89e3\u91ca\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u6211\u53ea\u662f\u7528\u5b83\u4f5c\u4e3a\u53c2\u8003\u3002\u4f46\u662f\u5728React17\u4e4b\u540e\uff0c\u4e0d\u518d\u4e3b\u6d41\u4f7f\u7528createElement\u7684\u65b9\u6cd5\u3002
\n\u6839\u636e\u5f53\u65f6\u7684\u6587\u6863\uff0c\u8fd9\u79cd\u60c5\u51b5\u5c06\u88ab\u8f6c\u8bd1\u4e3a\u4ee5\u4e0b\u5f62\u5f0f\u3002<\/p>\n
import<\/span> {<\/span>jsx<\/span> as<\/span> _jsx<\/span>}<\/span> from<\/span> '<\/span>react\/jsx-runtime<\/span>'<\/span>;<\/span>\r\nimport<\/span> React<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nlet<\/span> button<\/span> =<\/span> _jsx<\/span>(<\/span>'<\/span>button<\/span>'<\/span>,<\/span> {<\/span> children<\/span>:<\/span> '<\/span>Click me<\/span>'<\/span> });<\/span>\r\nrender<\/span>(<\/span>button<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u4e0d\u518d\u4f7f\u7528react\u7684createElement\u65b9\u6cd5\uff0c\u800c\u662f\u4f7f\u7528react\/jsx-runtime\u4e2d\u7684_jsx\u3002\u5728\u5148\u524d\u7684\u6587\u6863\u4e2d\u6709\u5199\u5230\u8fd9\u6837\u505a\u7684\u597d\u5904\u3002
\n\u65e2\u7136\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u7ee7\u7eed\u4f7f\u7528\u8fd9\u79cd\u65b0\u7684\u8f6c\u6362\u683c\u5f0f\u3002
\n_jsx\u662f\u5982\u4f55\u8f6c\u6362\u7684\u5462\uff1freact\/jsx-runtime\u662f\u4ece\u8fd9\u6bb5\u4ee3\u7801\u5f00\u59cb\uff0c\u5e76\u4e14\u5927\u90e8\u5206\u7684\u5904\u7406\u903b\u8f91\u90fd\u5199\u5728\u4e86ReactJSXElement.js\u4e2d\u3002
\n\u5927\u81f4\u4e0a\u6765\u770b\uff0cJSX\u4f3c\u4e4e\u4f1a\u88ab\u8f6c\u6362\u6210\u4ee5\u4e0b\u7684\u5bf9\u8c61\u5f62\u5f0f\u3002<\/p>\n
{<\/span>\r\n  $$typeof<\/span>:<\/span> REACT_ELEMENT_TYPE<\/span>,<\/span>\r\n  type<\/span>:<\/span> type<\/span>,<\/span>\r\n  key<\/span>:<\/span> key<\/span>,<\/span>\r\n  ref<\/span>:<\/span> ref<\/span>,<\/span>\r\n  props<\/span>:<\/span> props<\/span>,<\/span>\r\n  _owner<\/span>:<\/span> owner<\/span>,<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5728\u4e2d\u56fd\u5927\u9646\u8bf4\uff0c_jsx\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662ftype\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662fref\u548cprops\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u662fkey\u3002\u5982\u679cprops\u7684children\u662fJSX\uff0c\u90a3\u4e48_jsx\u4f1a\u7ee7\u7eed\u4e0b\u53bb\uff0c\u56e0\u6b64\u4f1a\u5f62\u6210\u4e00\u4e2a\u5d4c\u5957\u7684\u6811\u7ed3\u6784\u3002<\/p>\n
{<\/span>\r\n  $$typeof<\/span>:<\/span> REACT_ELEMENT_TYPE<\/span>,<\/span>\r\n  type<\/span>:<\/span> type1<\/span>,<\/span>\r\n  key<\/span>:<\/span> key1<\/span>,<\/span>\r\n  ref<\/span>:<\/span> ref1<\/span>,<\/span>\r\n  props<\/span>:<\/span> {<\/span>\r\n    children<\/span>:<\/span> [<\/span>\r\n      {<\/span>\r\n        $<\/span>$typeof<\/span>:<\/span> REACT_ELEMENT_TYPE<\/span>,<\/span>\r\n        type<\/span>:<\/span> type2<\/span>,<\/span>\r\n        key<\/span>:<\/span> key2<\/span>,<\/span>\r\n        ref<\/span>:<\/span> ref2<\/span>,<\/span>\r\n        props<\/span>:<\/span> props2<\/span>,<\/span>\r\n        _owner<\/span>:<\/span> owner<\/span>,<\/span>\r\n      },<\/span>\r\n    ],<\/span>\r\n  },<\/span>\r\n  _owner<\/span>:<\/span> owner<\/span>,<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u53ef\u80fd\u88ab\u8ba4\u4e3a\u662f\u6587\u6863\u4e2d\u7684UI\u6811\uff08\u7531\u4e8e\u6587\u6863\u4e2d\u6ca1\u6709\u660e\u786e\u8bf4\u660e\uff0c\u6240\u4ee5\u53ea\u662f\u63a8\u6d4b\uff09\u3002
\n\u521a\u624d\u7684\u4f8b\u5b50\u4f1a\u88ab\u8f6c\u5316\u4e3a\u4ee5\u4e0b\u7684\u5f62\u5f0f\u3002<\/p>\n
{<\/span>\r\n  $$typeof<\/span>:<\/span> Symbol<\/span>(<\/span>react<\/span>.<\/span>element<\/span>),<\/span>\r\n  type<\/span>:<\/span> '<\/span>button<\/span>'<\/span>,<\/span>\r\n  key<\/span>:<\/span> null<\/span>,<\/span>\r\n  ref<\/span>:<\/span> null<\/span>,<\/span>\r\n  props<\/span>:<\/span> {<\/span>\r\n    children<\/span>:<\/span> '<\/span>Click me<\/span>'<\/span>\r\n  },<\/span>\r\n  _owner<\/span>:<\/span> null<\/span>,<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5b9e\u9645\u4e0a\uff0c\u5f53\u5728\u6d4f\u89c8\u5668\u4e0a\u663e\u793a\u65f6\uff0c\u65e0\u9700\u8ffd\u8e2aReact\u4ee3\u7801\uff0c\u56e0\u4e3a\u5df2\u7ecf\u5b8c\u6210\u4e86\u8f6c\u8bd1\u3002\u60a8\u53ef\u4ee5\u5728\u60a8\u7684\u73af\u5883\u4e2d\u901a\u8fc7\u5c06console.log(