{"id":37922,"date":"2023-12-30T23:28:56","date_gmt":"2024-03-12T04:18:30","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91react-v18-%e5%8f%8d%e5%ba%94%e5%ba%93%e7%89%88%e6%9c%ac18\/"},"modified":"2024-05-04T16:04:11","modified_gmt":"2024-05-04T08:04:11","slug":"%e3%80%90react%e3%80%91react-v18-%e5%8f%8d%e5%ba%94%e5%ba%93%e7%89%88%e6%9c%ac18","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91react-v18-%e5%8f%8d%e5%ba%94%e5%ba%93%e7%89%88%e6%9c%ac18\/","title":{"rendered":"\u3010React\u3011React v18 \u53cd\u5e94\u5e93\u7248\u672c18"},"content":{"rendered":"

JSX\u8bed\u6cd5<\/h1>\n

\u9996\u5148\uff0c\u5728React\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e00\u79cd\u79f0\u4e3aJSX\u8bed\u6cd5\u7684\u5199\u6cd5\u3002JSX\u662fJavaScript XML\u7684\u7f29\u5199\uff0c\u5b83\u5141\u8bb8\u5728JavaScript\u6587\u4ef6\u4e2d\u7c7b\u4f3cHTML\u7684\u6807\u7b7e\u6765\u7f16\u5199\uff0c\u662fJavaScript\u7684\u6269\u5c55\u8bed\u6cd5\u3002<\/p>\n

import<\/span> {<\/span> createRoot<\/span> }<\/span> from<\/span> '<\/span>react-dom\/client<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span> App<\/span> }<\/span> from<\/span> '<\/span>.\/App<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> container<\/span> =<\/span> document<\/span>.<\/span>getElementById<\/span>(<\/span>'<\/span>app<\/span>'<\/span>);<\/span>\r\nconst<\/span> root<\/span> =<\/span> createRoot<\/span>(<\/span>container<\/span>!<\/span>);<\/span> \r\n\r\nroot<\/span>.<\/span>render<\/span>(<<\/span>App<\/span> \/>);<\/span>\r\n<\/code><\/pre>\n
\u5728React\u4e2d\uff0c\u53c2\u6570\u8868\u793a\u5c06\u51fd\u6570\u540d\u4f5c\u4e3aHTML\u6807\u7b7e\u8fdb\u884c\u5c01\u88c5\uff0c\u4ee5\u4fbf\u5c06\u5176\u4f5c\u4e3a\u7ec4\u4ef6\u5904\u7406\u3002<\/p>\n
\u5982\u679c\u4f7f\u7528TypeScript\uff0c\u7531\u4e8e\u4f1a\u6536\u5230\u8b66\u544a\uff0c\u8bf7\u52a1\u5fc5\u5728const root = createRoot(container!);\u7684\u90e8\u5206\u6dfb\u52a0!\u3002<\/p>\n
getElementById(‘app’)\u4e2d\u7684’app’\u8868\u793aHTML\u7684div\u6807\u7b7e\u3002<\/p>\n
<!DOCTYPE html><\/span>\r\n<html<\/span> lang=<\/span>\"en\"<\/span>><\/span>\r\n    <head><\/span>\r\n        \u7701\u7565\r\n    <\/head><\/span>\r\n    <body><\/span>\r\n        <div<\/span> id=<\/span>\"app\"<\/span>><\/div><\/span>  \/\/ \u6307\u793a\u3055\u308c\u305fdiv\u30bf\u30b0\r\n    <\/body><\/span>\r\n<\/html><\/span>\r\n<\/code><\/pre>\n
\u5728SPA\u7684\u60c5\u51b5\u4e0b\uff0c\u7531\u4e8e\u53ea\u6709\u4e00\u4e2aHTML\u6587\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5c06\u7ec4\u4ef6\u6e32\u67d3\u5230HTML\u7684\u7279\u5b9a\u4f4d\u7f6e\u7684\u65b9\u5f0f\u6765\u6307\u5b9a\u3002\u4f8b\u5982\uff0c\u5047\u8bbeApp\u7ec4\u4ef6\u7684\u5185\u5bb9\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
export<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    return <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello.World<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u306f\u3058\u3081\u307e\u3057\u3066<\/<\/span>p<\/span>><\/span>\r\n    <\/><\/span>\r\n    );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5728\u6d4f\u89c8\u5668\u4e2d\u8fdb\u884c\u786e\u8ba4\u65f6\uff0c\u6211\u8ba4\u4e3a\u5e94\u8be5\u4f1a\u8f93\u51faApp\u3002\u5728JSX\u8bed\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u5c06HTML\u6807\u7b7e\u4f5c\u4e3a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u8fdb\u884c\u63cf\u8ff0\uff0c\u5e76\u5c06\u5176\u4f5c\u4e3a\u7ec4\u4ef6\u6765\u6784\u5efa\u754c\u9762\u3002<\/p>\n
JSX\u89c4\u5219<\/h1>\n
\u4ee5\u4e0b\u662f\u5148\u524d\u63d0\u5230\u7684App\u51fd\u6570\u7684\u793a\u4f8b\u3002\u9996\u5148\uff0c\u5728return\u540e\u9762\u4f1a\u6709\u591a\u884c\u4ee3\u7801\u65f6\uff0c\u9700\u8981\u5c06\u5176\u7528\u62ec\u53f7( )\u62ec\u8d77\u6765\u3002
\n\u800c\u4e14\uff0creturn\u540e\u9762\u7684\u90e8\u5206\u5fc5\u987b\u7531\u4e00\u4e2a\u6807\u8bb0\u5305\u56f4\u3002\u672c\u4f8b\u4e2d\u6211\u4eec\u4f7f\u7528\u4e86\u4e00\u4e2a\u7a7a\u6807\u8bb0\u8fdb\u884c\u5305\u56f4\u3002\u4e5f\u53ef\u4ee5\u4f7f\u7528div\u6807\u8bb0\u7b49\uff0c\u4f46\u662f\u7a7a\u6807\u8bb0\u662f\u6709\u6548\u5730\u907f\u514d\u9519\u8bef\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4f1a\u751f\u6210\u4e0d\u5fc5\u8981\u7684DOM\u5185\u5bb9\u3002<\/p>\n
\u7ec4\u4ef6<\/h1>\n
\u5728React\u5f00\u53d1\u4e2d\uff0c\u901a\u8fc7\u5c06\u5c4f\u5e55\u5143\u7d20\u5206\u5272\u4e3a\u5404\u79cd\u7ec4\u4ef6\u6765\u63d0\u9ad8\u53ef\u91cd\u7528\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u662f\u57fa\u672c\u539f\u5219\u3002\u50cf\u4e4b\u524d\u521b\u5efa\u7684`App`\u51fd\u6570\u7b49\u88ab\u5b9a\u4e49\u4e3a\u51fd\u6570\u7ec4\u4ef6\u7684\u7ec4\u4ef6\u5c31\u88ab\u79f0\u4e3a\u51fd\u6570\u7ec4\u4ef6\u3002<\/p>\n
export<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    return <\/span>(<\/span>\r\n    <><\/span>\r\n      <<\/span>h1<\/span>><\/span>Hello.World<\/<\/span>h1<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>\u306f\u3058\u3081\u307e\u3057\u3066<\/<\/span>p<\/span>><\/span>\r\n    <\/><\/span>\r\n    );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u51fd\u6570\u7ec4\u4ef6\u9700\u8981\u88ab\u5bfc\u51fa\u4ee5\u4fbf\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u4f7f\u7528\u3002\u88ab\u5bfc\u51fa\u7684\u5185\u5bb9\u53ef\u4ee5\u901a\u8fc7\u5bfc\u5165\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u4f7f\u7528\u3002
\n\u4ee5\u7b2c\u4e00\u4e2a\u4ee3\u7801\u4e3a\u4f8b\uff0c\u53ef\u4ee5\u8fd9\u6837\u8868\u8fbe\u3002<\/p>\n
import<\/span> {<\/span> createRoot<\/span> }<\/span> from<\/span> '<\/span>react-dom\/client<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span> App<\/span> }<\/span> from<\/span> '<\/span>.\/App<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> container<\/span> =<\/span> document<\/span>.<\/span>getElementById<\/span>(<\/span>'<\/span>app<\/span>'<\/span>);<\/span>\r\nconst<\/span> root<\/span> =<\/span> createRoot<\/span>(<\/span>container<\/span>!<\/span>);<\/span> \r\n\r\nroot<\/span>.<\/span>render<\/span>(<<\/span>App<\/span> \/>);<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u4ece\u540c\u5c42\u7ea7\u7684App.js\u6587\u4ef6\u4e2d\u52a0\u8f7d\u4e00\u4e2a\u540d\u4e3aApp\u7684\u51fd\u6570\u7ec4\u4ef6\u3002\u53ef\u4ee5\u7701\u7565\u6587\u4ef6\u6269\u5c55\u540d\u3002
\n\u901a\u8fc7\u5728\u5404\u4e2a\u6587\u4ef6\u4e2d\u5b9a\u4e49\u7ec4\u4ef6\uff0c\u5e76\u4ece\u5176\u4ed6\u6587\u4ef6\u4e2d\u52a0\u8f7d\u7ec4\u4ef6\u6765\u6784\u5efa\u754c\u9762\uff0c\u8fd9\u5c31\u662fReact\u7684\u5de5\u4f5c\u65b9\u5f0f\u3002<\/p>\n
\u6587\u4ef6\u7684\u6269\u5c55\u540d de<\/h1>\n
React\u53ef\u4ee5\u53ea\u8fd0\u884cJavaScript\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528.js\u6269\u5c55\u540d\u8fdb\u884c\u64cd\u4f5c\u3002\u5bf9\u4e8e\u7ec4\u4ef6\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528.jsx\u6269\u5c55\u540d\u8fdb\u884c\u64cd\u4f5c\u3002\u5bf9\u4e8eTypeScript\uff0c\u53ef\u4ee5\u4f7f\u7528.tsx\u6269\u5c55\u540d\u3002\u6839\u636e\u7f16\u8f91\u5668\u7684\u8bbe\u7f6e\uff0c\u66f4\u6539\u6269\u5c55\u540d\u8fd8\u53ef\u4ee5\u6539\u53d8\u6587\u4ef6\u7684\u56fe\u6807\uff0c\u8fd9\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n
\u5173\u4e8e\u4e8b\u4ef6\u548c\u98ce\u683c\u7684\u5904\u7406\u65b9\u6cd5<\/h1>\n
\u9996\u5148\u4f5c\u4e3a\u4e8b\u4ef6\u5904\u7406\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u6765\u521b\u5efa\u4e00\u4e2a\u5f53\u6309\u94ae\u88ab\u6309\u4e0b\u65f6\u6267\u884c\u8b66\u544a\u5f39\u51fa\u529f\u80fd\u3002<\/p>\n
export<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    const<\/span> clickButton<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n     alert<\/span>();<\/span>\r\n    };<\/span>\r\n\r\n    return<\/span> <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>clickButton<\/span>}<\/span>><\/span>\u30dc\u30bf\u30f3<\/<\/span>button<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5728React\u4e2d\uff0c\u5f53\u4f60\u6309\u4e0b\u8fd9\u4e2a\u6309\u94ae\u65f6\uff0c\u4f1a\u663e\u793a\u4e00\u4e2aalert\u3002\u5728React\u4e2d\uff0c\u4e8b\u4ef6\u7b49\u90fd\u8981\u4f7f\u7528\u9a7c\u5cf0\u547d\u540d\u6cd5\u3002\u9a7c\u5cf0\u547d\u540d\u6cd5\u662f\u6307\u5c06\u5355\u8bcd\u7684\u8fde\u63a5\u90e8\u5206\u5927\u5199\u7684\u547d\u540d\u89c4\u8303\u3002\u53e6\u5916\uff0c\u5728JSX\u8bed\u6cd5\u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528{ }\u6765\u7f16\u5199JavaScript\u4ee3\u7801\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u8c08\u8c08\u6837\u5f0f\u7684\u5904\u7406\u65b9\u5f0f\u3002\u4e0e\u666e\u901a\u7684HTML\u4e00\u6837\uff0cReact\u4e5f\u53ef\u4ee5\u4f7f\u7528style\u5c5e\u6027\u6765\u5e94\u7528\u6837\u5f0f\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cCSS\u7684\u5c5e\u6027\u8981\u4ee5JavaScript\u5bf9\u8c61\u7684\u5f62\u5f0f\u6765\u7f16\u5199\u3002<\/p>\n
export<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    return<\/span> <<\/span>h1<\/span> style<\/span>=<\/span>{<\/span>{<\/span> color<\/span>:<\/span> \"<\/span>red<\/span>\"<\/span> }<\/span>}<\/span>><\/span>Hello.World<\/<\/span>h1<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u56e0\u4e3a\u8981\u6307\u5b9a\u6837\u5f0f\u5e76\u7f16\u5199JavaScript\uff0c\u6240\u4ee5\u9700\u8981\u7528\u5927\u62ec\u53f7\u5305\u56f4\uff0c\u5728\u5176\u4e2d\u7528\u5bf9\u8c61\u6765\u6307\u5b9a\u4e0eCSS\u5bf9\u5e94\u7684\u5143\u7d20\uff0c\u56e0\u6b64\u5e94\u8be5\u662f\u53cc\u5927\u62ec\u53f7\u3002<\/p>\n
\u9053\u5177<\/h1>\n
Props\u662f\u4f20\u9012\u7ed9\u7ec4\u4ef6\u4f5c\u4e3a\u53c2\u6570\u7684\u4e00\u79cd\u4e1c\u897f\u3002\u7ec4\u4ef6\u6839\u636e\u63a5\u6536\u5230\u7684Props\u6765\u6539\u53d8\u663e\u793a\u6837\u5f0f\u548c\u5185\u5bb9\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u5c1d\u8bd5\u5728\u4ee3\u7801\u4e2d\u6dfb\u52a0\u7c89\u8272\u6587\u5b57\u3002<\/p>\n
export<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    const<\/span> pinkStyle<\/span> =<\/span> {<\/span>\r\n        color<\/span>:<\/span> \"<\/span>Pink<\/span>\"<\/span>,<\/span>\r\n        fontSize<\/span>:<\/span> \"<\/span>10px<\/span>\"<\/span>\r\n    };<\/span>\r\n\r\n    return<\/span> <<\/span>h1<\/span> style<\/span>=<\/span>{<\/span>pinkStyle<\/span>}<\/span>><\/span>Hello.World<\/<\/span>h1<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u6309\u7167\u4e0a\u8ff0\u7684\u65b9\u6cd5\u8fdb\u884c\uff0c\u662f\u53ef\u4ee5\u5b9e\u73b0\u7684\uff0c\u4f46\u7f16\u5199\u7c7b\u4f3c\u7684style\u4f1a\u5f88\u9ebb\u70e6\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u63a5\u53d7\u989c\u8272\u548c\u6587\u672c\u4f5c\u4e3a\u5c5e\u6027\uff0c\u5e76\u8fd4\u56de\u5e26\u6709\u989c\u8272\u7684\u6587\u5b57\u7684\u7ec4\u4ef6\u3002\u6211\u4eec\u5c06\u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3aColored\u7684\u51fd\u6570\u3002<\/p>\n
export<\/span> const<\/span> Colored<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    const<\/span> pinkStyle<\/span> =<\/span> {<\/span>\r\n        color<\/span>:<\/span> \"<\/span>Pink<\/span>\"<\/span>,<\/span>\r\n        fontsize<\/span>:<\/span> \"<\/span>10px<\/span>\"<\/span>\r\n    };<\/span>\r\n    \r\n    return<\/span> <<\/span>h1<\/span> style<\/span>=<\/span>{<\/span>pinkStyle<\/span>}<\/span>><\/span>Hello.World<\/<\/span>h1<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u6211\u5011\u8a66\u8a66\u5728\u61c9\u7528\u7a0b\u5f0f\u5167\u4f7f\u7528 Colored \u5143\u4ef6\u3002<\/p>\n
export<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    return<\/span> <<\/span>colored<\/span> \/>;<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u6837\u4e00\u6765\uff0c\u521a\u521a\u7684\u9875\u9762\u663e\u793a\u4ecd\u7136\u6ca1\u6709\u53d8\u5316\uff0c\u53ea\u662f\u5728\u6587\u5b57\u90e8\u5206\u5c06\u5176\u7ec4\u4ef6\u5316\u540e\u518d\u663e\u793a\u51fa\u6765\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u4f7f\u7528Props\u6765\u5b9e\u73b0\u52a8\u6001\u53d8\u66f4\u3002
\n\u4e3a\u4e86\u4f7f\u7528Props\uff0c\u6211\u4eec\u9700\u8981\u540c\u65f6\u4fee\u6539\u4f20\u9012Props\u7684\u7ec4\u4ef6\u548c\u63a5\u6536Props\u7684\u7ec4\u4ef6\u3002
\n\u9996\u5148\uff0c\u5728\u4f20\u9012Props\u7684\u7ec4\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u7ed9\u4efb\u610f\u540d\u79f0\u7684Props\u4f20\u9012\u4e00\u4e2a\u503c\uff0c\u7136\u540e\u5728\u7b49\u53f7\u540e\u9762\u8bbe\u7f6e\u5177\u4f53\u7684\u4f20\u9012\u503c\u3002<\/p>\n
\/\/ color\u3068message\u3092Props\u3068\u3057\u3066\u6e21\u3059<\/span>\r\nexport<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    return<\/span> <<\/span>colored<\/span> color<\/span>=<\/span>\"Pink\"<\/span> message<\/span>=<\/span>\"Hello.World\"<\/span> \/>;<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u7136\u540e\uff0c\u6211\u4eec\u6765\u68c0\u67e5\u4f20\u9012\u8fc7\u6765\u7684Props\u3002\u7531\u4e8e\u7ec4\u4ef6\u4f1a\u4ee5\u5bf9\u8c61\u7684\u5f62\u5f0f\u4f20\u5165Props\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u7528\u4efb\u4f55\u81ea\u5b9a\u4e49\u7684\u540d\u79f0\u6765\u63a5\u6536\u5b83\u4eec\u3002\uff08\u901a\u5e38\u4f7f\u7528Props\u4f5c\u4e3a\u540d\u79f0\uff09\u3002<\/p>\n
\/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u53d7\u3051\u53d6\u308b<\/span>\r\nexport<\/span> const<\/span> Colored<\/span> =<\/span> (<\/span>props<\/span>)<\/span> =><\/span> {<\/span>\r\n    const<\/span> pinkStyle<\/span> =<\/span> {<\/span>\r\n        color<\/span>:<\/span> props<\/span>.<\/span>color<\/span>,<\/span>\r\n        fontsize<\/span>:<\/span> \"<\/span>10px<\/span>\"<\/span>\r\n    };<\/span>\r\n    \r\n    return<\/span> <<\/span>h1<\/span> style<\/span>=<\/span>{<\/span>pinkStyle<\/span>}<\/span>><\/span>{<\/span>props<\/span>.<\/span>message<\/span>}<\/span><\/<\/span>h1<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5c06style\u7684color\u90e8\u5206\u548cmessage\u90e8\u5206\u66f4\u6539\u4e3a\u901a\u8fc7Props\u63a5\u6536\u7684\u5185\u5bb9\u3002\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u53ef\u4ee5\u52a8\u6001\u66f4\u6539\u989c\u8272\u548c\u6587\u5b57\u7684\u7ec4\u4ef6\u3002<\/p>\n
\u5b69\u5b50\u4eec<\/h1>\n
\u5728\u4e4b\u524d\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3aProps\u8bbe\u7f6e\u4efb\u4f55\u540d\u79f0\u3002\u7ec4\u4ef6\u4e5f\u53ef\u4ee5\u50cfHTML\u6807\u7b7e\u4e00\u6837\u7528\u4efb\u4f55\u5143\u7d20\u5305\u56f4\u5e76\u4f7f\u7528\u3002\u7136\u540e\uff0c\u88ab\u5305\u56f4\u7684\u90e8\u5206\u5c06\u4f5c\u4e3achildren\u4f20\u9012\u7ed9Props\u3002<\/p>\n
\/\/ children\u3068\u3057\u3066\u6e21\u3059<\/span>\r\nexport<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    return<\/span> <<\/span>Colored<\/span> color<\/span>=<\/span>\"Pink\"<\/span>><\/span>Hello.world<\/<\/span>Colored<\/span>>;<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\/\/ children\u3092\u53d7\u3051\u53d6\u308b<\/span>\r\nexport<\/span> const<\/span> Colored<\/span> =<\/span> (<\/span>props<\/span>)<\/span> =><\/span> {<\/span>\r\n    const<\/span> pinkStyle<\/span> =<\/span> {<\/span>\r\n        color<\/span>:<\/span> props<\/span>.<\/span>color<\/span>,<\/span>\r\n        fontsize<\/span>:<\/span> \"<\/span>10px<\/span>\"<\/span>\r\n    };<\/span>\r\n    \r\n    return<\/span> <<\/span>h1<\/span> style<\/span>=<\/span>{<\/span>pinkStyle<\/span>}<\/span>><\/span>{<\/span>props<\/span>.<\/span>children<\/span>}<\/span><\/<\/span>h1<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u73b0\u5728\uff0c\u5173\u4e8e\u6587\u672c\u90e8\u5206\uff0c\u6211\u4eec\u5df2\u7ecf\u53ef\u4ee5\u4f7f\u7528children\u6765\u5b9e\u73b0\u4e86\u3002
\n\u4ee5\u4e0a\u662fprops\u548cchildren\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u4f46\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u89e3\u6784\u8d4b\u503c\u548c\u5bf9\u8c61\u7701\u7565\u6cd5\u6765\u66f4\u7b80\u6d01\u5730\u7f16\u5199\u4ee3\u7801\u3002
\n\u5982\u679c\u770b\u4e00\u4e0bColored\u7ec4\u4ef6\uff0c\u5f53\u4f7f\u7528props\u65f6\uff0c\u6bcf\u6b21\u90fd\u8981\u5199props.~\u3002\u8fd9\u4e2a\u7a0b\u5ea6\u7684\u8bdd\u53ef\u80fd\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u662f\u5982\u679cprops\u7684\u6570\u91cf\u5f88\u591a\u6216\u8005\u9700\u8981\u591a\u6b21\u4f7f\u7528\uff0c\u4f1a\u6709\u70b9\u9ebb\u70e6\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5148\u5bf9props\u8fdb\u884c\u89e3\u6784\u8d4b\u503c\u3002<\/p>\n
export<\/span> const<\/span> Colored<\/span> =<\/span> (<\/span>props<\/span>)<\/span> =><\/span> {<\/span>\r\n    const<\/span> {<\/span>color<\/span>,<\/span> children<\/span>}<\/span> =<\/span> props<\/span>;<\/span>\r\n\r\n    const<\/span> pinkStyle<\/span> =<\/span> {<\/span>\r\n        color<\/span>:<\/span> color<\/span>,<\/span>\r\n        fontsize<\/span>:<\/span> \"<\/span>10px<\/span>\"<\/span>\r\n    };<\/span>\r\n    \r\n    return<\/span> <<\/span>h1<\/span> style<\/span>=<\/span>{<\/span>pinkStyle<\/span>}<\/span>><\/span>{<\/span>children<\/span>}<\/span><\/<\/span>h1<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u4f7f\u7528\u5206\u5272\u4ee3\u5165\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u63cf\u8ff0\u51cf\u5c11\u3002\u6b64\u5916\uff0c\u7531\u4e8e\u989c\u8272\u7684\u5c5e\u6027\u540d\u548c\u8bbe\u7f6e\u503c\u76f8\u540c\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5bf9\u8c61\u7b80\u5199\u6cd5\u3002<\/p>\n
export<\/span> const<\/span> Colored<\/span> =<\/span> (<\/span>props<\/span>)<\/span> =><\/span> {<\/span>\r\n    const<\/span> {<\/span>color<\/span>,<\/span> children<\/span>}<\/span> =<\/span> props<\/span>;<\/span>\r\n\r\n    const<\/span> pinkStyle<\/span> =<\/span> {<\/span>\r\n        color<\/span>,<\/span>\r\n        fontsize<\/span>:<\/span> \"<\/span>10px<\/span>\"<\/span>\r\n    };<\/span>\r\n    \r\n    return<\/span> <<\/span>h1<\/span> style<\/span>=<\/span>{<\/span>pinkStyle<\/span>}<\/span>><\/span>{<\/span>children<\/span>}<\/span><\/<\/span>h1<\/span>><\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u72b6\u6001\uff08\u4f7f\u7528\u72b6\u6001\uff09<\/h1>\n
\u5728React\u4e2d\uff0c\u6240\u6709\u8981\u663e\u793a\u5728\u5c4f\u5e55\u4e0a\u7684\u6570\u636e\u548c\u53ef\u53d8\u7684\u72b6\u6001\u90fd\u4f1a\u88ab\u7edf\u4e00\u7ba1\u7406\u4e3aState\u3002State\u8868\u793a\u7ec4\u4ef6\u7684\u72b6\u6001\u503c\u3002\u901a\u8fc7\u66f4\u65b0\u5904\u7406\uff0c\u4f8b\u5982\u5728\u4e8b\u4ef6\u6267\u884c\u65f6\uff0c\u53ef\u4ee5\u5b9e\u73b0\u52a8\u6001\u5e94\u7528\u7a0b\u5e8f\u3002
\n\u6211\u4eec\u5c06\u4f7f\u7528React Hooks\u4e2d\u7684useState\u51fd\u6570\u6765\u5904\u7406State\u3002\u7531\u4e8euseState\u662fReact\u63d0\u4f9b\u7684\uff0c\u6240\u4ee5\u5728\u4f7f\u7528\u4e4b\u524d\u9700\u8981\u8fdb\u884c\u4ee5\u4e0b\u5bfc\u5165\u64cd\u4f5c\u3002<\/p>\n
\/\/ useState\u306eimport<\/span>\r\nimport<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n<\/code><\/pre>\n
useState\u8fd4\u56de\u503c\u4ee5\u6570\u7ec4\u5f62\u5f0f\u5448\u73b0\uff0c\u7b2c\u4e00\u4e2a\u5143\u7d20\u662f\u5177\u6709\u72b6\u6001\u7684State\u53d8\u91cf\uff0c\u7b2c\u4e8c\u4e2a\u5143\u7d20\u662f\u7528\u4e8e\u66f4\u65b0\u8be5State\u7684\u51fd\u6570\u3002<\/p>\n
\/\/ useState\u306e\u4f7f\u7528\u4f8b<\/span>\r\nconst<\/span> [<\/span>count<\/span>,<\/span> setCount<\/span>]<\/span> =<\/span> useState<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u60c5\u51b5\u4e2d\uff0ccount\u662f\u4e00\u4e2a\u5177\u6709\u72b6\u6001\u7684\u53d8\u91cf\uff0csetCount\u662f\u7528\u4e8e\u66f4\u65b0\u5b83\u7684\u51fd\u6570\u3002\u7c7b\u4f3c\u4e8e\u6570\u7ec4\u7684\u89e3\u6784\u8d4b\u503c\uff0c\u60a8\u53ef\u4ee5\u81ea\u7531\u5730\u7ed9\u5b83\u4eec\u8d77\u540d\u5b57\uff0c\u4f46\u9690\u542b\u7684\u89c4\u5219\u662f\u5c06\u53d8\u91cf\u540d\u8bbe\u7f6e\u4e3aset\u53d8\u91cf\u540d\u3002\u5728\u4e0a\u8ff0\u60c5\u51b5\u4e2d\uff0c\u7531\u4e8ecount\u8fd8\u6ca1\u6709\u503c\uff0c\u56e0\u6b64\u7ecf\u5e38\u9700\u8981\u8bbe\u7f6e\u521d\u59cb\u503c\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528useState\u51fd\u6570\u6765\u8bbe\u7f6e\u53c2\u6570\u3002<\/p>\n
\/\/ State\u521d\u671f\u5024\u306e\u8a2d\u5b9a\u65b9\u6cd5<\/span>\r\nconst<\/span> [<\/span>count<\/span>,<\/span> setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u63d0\u4f9b\u53c2\u6570\uff0c\u53ef\u4ee5\u5c06\u5176\u8bbe\u7f6e\u4e3a\u72b6\u6001\u7684\u521d\u59cb\u503c\u3002
\n\u73b0\u5728\uff0c\u6211\u4eec\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff0c\u8bd5\u7740\u5b9e\u73b0\u4e00\u4e2a\u6309\u4e0b\u6309\u94ae\u65f6\u9010\u6e10\u589e\u52a0\u8ba1\u6570\u7684\u529f\u80fd\u3002<\/p>\n
import<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    \/\/State\u5b9a\u7fa9<\/span>\r\n    const<\/span> [<\/span>count<\/span>,<\/span> setCount<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n    \/\/ State\u3092\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u3059\u308b\u95a2\u6570<\/span>\r\n    const<\/span> countButton<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n        setCount<\/span>(<\/span>count<\/span> +<\/span> 1<\/span>);<\/span>\r\n    };<\/span>\r\n\r\n    return <\/span>(<\/span>\r\n        <><\/span>\r\n            <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>countButton<\/span>}<\/span>><\/span>\u30dc\u30bf\u30f3<\/<\/span>button<\/span>><\/span>\r\n            <<\/span>p<\/span>><\/span>{<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n        <\/><\/span>\r\n    );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5f53\u6309\u4e0b\u8be5\u6309\u94ae\u65f6\uff0csetCount\u5c06\u66f4\u65b0\u72b6\u6001\u5e76\u9012\u589e\u6570\u503c\u3002\u8fd9\u53ea\u662f\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684\u7528\u6cd5\uff0c\u4f5c\u4e3a\u5904\u7406\u72b6\u6001\u7684\u65b9\u5f0f\u4ec5\u9650\u4e8e\u6b64\u3002\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u4e0d\u4ec5\u4ec5\u662f\u8fd9\u6b21\u7684\u6570\u503c\uff0c\u4efb\u4f55\u5bf9\u8c61\u3001\u6570\u7ec4\u7b49\u90fd\u53ef\u4ee5\u4f5c\u4e3a\u72b6\u6001\u8fdb\u884c\u7ba1\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
JSX\u8bed\u6cd5 \u9996\u5148\uff0c\u5728React\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e00\u79cd\u79f0\u4e3aJSX\u8bed\u6cd5\u7684\u5199\u6cd5\u3002JSX\u662fJavaScript XML\u7684\u7f29\u5199 […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-37922","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u3010React\u3011React v18 \u53cd\u5e94\u5e93\u7248\u672c18 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011react-v18-\u53cd\u5e94\u5e93\u7248\u672c18\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010React\u3011React v18 \u53cd\u5e94\u5e93\u7248\u672c18\" \/>\n<meta property=\"og:description\" content=\"JSX\u8bed\u6cd5 \u9996\u5148\uff0c\u5728React\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e00\u79cd\u79f0\u4e3aJSX\u8bed\u6cd5\u7684\u5199\u6cd5\u3002JSX\u662fJavaScript XML\u7684\u7f29\u5199 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011react-v18-\u53cd\u5e94\u5e93\u7248\u672c18\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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