{"id":38594,"date":"2023-07-07T11:31:06","date_gmt":"2023-04-16T06:59:11","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/react%e7%9a%84classname%e5%b1%9e%e6%80%a7%e5%92%8cstyle%e5%b1%9e%e6%80%a7%e6%98%afreact%e7%9a%84%e6%89%a9%e5%b1%95%e5%90%97%ef%bc%9f\/"},"modified":"2024-04-30T12:26:18","modified_gmt":"2024-04-30T04:26:18","slug":"react%e7%9a%84classname%e5%b1%9e%e6%80%a7%e5%92%8cstyle%e5%b1%9e%e6%80%a7%e6%98%afreact%e7%9a%84%e6%89%a9%e5%b1%95%e5%90%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/react%e7%9a%84classname%e5%b1%9e%e6%80%a7%e5%92%8cstyle%e5%b1%9e%e6%80%a7%e6%98%afreact%e7%9a%84%e6%89%a9%e5%b1%95%e5%90%97%ef%bc%9f\/","title":{"rendered":"React\u7684className\u5c5e\u6027\u548cstyle\u5c5e\u6027\u662fReact\u7684\u6269\u5c55\u5417\uff1f"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u5f53\u5728HTML\u4e2d\u6307\u5b9a\u7c7b\u540d\u6216\u5185\u8054\u6837\u5f0f\u65f6\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\u7f16\u5199\u3002<\/p>\n

<div<\/span> class=<\/span>\"your-name\"<\/span> style=<\/span>\"color: #FF0000;\"<\/span>><\/span>\r\n  Hello World!\r\n<\/div><\/span>\r\n<\/code><\/pre>\n
\u5728 React (JSX) \u4e2d\uff0c\u53ef\u4ee5\u8fd9\u6837\u8868\u8fbe\u3002<\/p>\n
<<\/span>div<\/span> className<\/span>=<\/span>\"your-name\"<\/span> style<\/span>=<\/span>{<\/span>{<\/span> '<\/span>color<\/span>'<\/span>:<\/span> '<\/span>#FF0000<\/span>'<\/span> }<\/span>}<\/span>><\/span>\r\n  Hello World!\r\n<\/<\/span>div<\/span>><\/span>\r\n<\/code><\/pre>\n
\u5728\u516c\u5f0f\u6587\u4ef6\u4e2d\uff0c\u4e5f\u63d0\u5230\u4e86\u5728 React \u548c HTML \u4e2d\u6709\u51e0\u4e2a\u5c5e\u6027\u7684\u884c\u4e3a\u662f\u4e0d\u540c\u7684\u3002<\/p>\n
 <\/p>\n
\u4ece\u4e0a\u9762\u53ef\u4ee5\u770b\u51fa\uff0cReact\u7684className\u5c5e\u6027\u548cstyle\u5c5e\u6027\u4e0eHTML\u4e0d\u540c\uff0c\u56e0\u6b64\u53ef\u4ee5\u8bf4\u5b83\u4eec\u662fReact\u7684\u6269\u5c55\u3002<\/p>\n
\u9664\u4e86onChange\u5c5e\u6027\u5916\uff0c\u8fd8\u6709\u8bb8\u591a\u4e0eHTML\u884c\u4e3a\u4e0d\u540c\u7684\u5c5e\u6027\uff0c\u5982select\/textarea\u6807\u7b7e\u7684value\/defaultValue\u5c5e\u6027\u3002<\/p>\n
JSX\u662fReact\u7684\u529f\u80fd\uff0c\u90a3\u4e48\u662f\u5426\u5e94\u8be5\u79f0\u5176\u4e3aJSX\u6269\u5c55\u800c\u4e0d\u662fReact\u5462\uff1f\u8fd9\u53ef\u80fd\u662f\u6b63\u786e\u7684\u3002<\/p>\n
\u4e0d\u662fReact\uff0c\u800c\u662fDOM\u7684\u6269\u5c55\uff1f<\/h1>\n
\u7136\u800c\uff0c\u636e\u8bf4\u5728 React \u4e2d\u4e0d\u4ec5\u4ec5\u662f\u5b57\u7b26\u4e32\uff0c\u8fd8\u53ef\u4ee5\u7528className\u8fd9\u6837\u7684\u540d\u79f0\u6216\u5185\u8054\u6837\u5f0f\u8fdb\u884c\u6307\u5b9a\uff0c\u8fd9\u662f JavaScript \u672c\u8eab\u5c31\u5177\u5907\u7684\u7279\u6027\u3002<\/p>\n
document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>div<\/span>'<\/span>)[<\/span>0<\/span>].<\/span>style<\/span>.<\/span>color<\/span> =<\/span> '<\/span>#00FF00<\/span>'<\/span>;<\/span>\r\ndocument<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>div<\/span>'<\/span>)[<\/span>0<\/span>].<\/span>className<\/span> =<\/span> '<\/span>another-class-name<\/span>'<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u4e0d\u662f React \u7684\u6269\u5c55\u5417\uff1f\u4e3a\u4e86\u8fdb\u884c\u8c03\u67e5\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b JSX \u7684\u8f6c\u8bd1\u7ed3\u679c\u3002\uff08\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u4f7f\u7528\u7684\u662f React 17.0.2\uff0c\u800c\u6ca1\u6709\u4f7f\u7528 React 17 \u7684\u65b0\u529f\u80fd_jsx\u548c_jsxs\u3002\u6839\u636e\u73af\u5883\u7684\u4e0d\u540c\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u8fd9\u6837\u7684\u8f6c\u6362\u7ed3\u679c\u3002\uff09<\/p>\n
l<\/span>.<\/span>createElement<\/span>(<\/span>\r\n  \"<\/span>div<\/span>\"<\/span>,<\/span>\r\n  {<\/span>\r\n    className<\/span>:<\/span> \"<\/span>your-class-name<\/span>\"<\/span>,<\/span>\r\n    style<\/span>:<\/span> {<\/span>color<\/span>:<\/span>\"<\/span>#FF0000<\/span>\"<\/span>}<\/span>\r\n  },<\/span>\r\n  \"<\/span>Hello World!<\/span>\"<\/span>\r\n),<\/span>\r\n<\/code><\/pre>\n
l.createElement \u53ef\u80fd\u662f\u6307 React.createElement\u3002\u7136\u800c\uff0c\u6b64 createElement \u65b9\u6cd5\u4e0e JavaScript \u7684 DOM \u4e2d\u539f\u6709\u7684\u540c\u540d\u65b9\u6cd5\u4e0d\u540c\uff0c\u56e0\u6b64\u4ece\u8fd9\u4e2a\u610f\u4e49\u4e0a\u8bf4\uff0c\u5b83\u53ef\u4ee5\u88ab\u79f0\u4e3a\u662f React \u7684\u529f\u80fd\uff08\u6216 JSX \u7684\u529f\u80fd\uff09\u3002<\/p>\n
\u603b\u7ed3<\/h1>\n
\u5728React\u4e2d\uff0c\u5b58\u5728\u4e00\u4e9b\u4e0eHTML\u7684\u884c\u4e3a\u4e0d\u540c\u7684\u5c5e\u6027\uff0c\u5982className\u5c5e\u6027\u548cstyle\u5c5e\u6027\u3002\u6b64\u5916\uff0cJavaScript\u7684createElement\u65b9\u6cd5\u5e76\u6ca1\u6709\u6307\u5b9a\u8fd9\u4e9b\u5c5e\u6027\u7684\u529f\u80fd\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u8bf4\u8fd9\u4e9b\u5c5e\u6027\u662fReact\uff08JSX\uff09\u7684\u6269\u5c55\u3002\uff08\u8fd9\u662f\u4e2a\u4eba\u89c2\u70b9\uff09<\/p>\n
\u7ed9\u4f60\u4e2a\u5c0f\u793c\u7269\u3002<\/h1>\n
\u6700\u540e\uff0c\u6211\u4eec\u5c06\u9644\u4e0aHTML\u548c\u5404\u79cd\u6846\u67b6\u7684\u6bd4\u8f83\u3002\u4ece\u8fd9\u4e2a\u89d2\u5ea6\u6765\u770b\uff0c\u53ef\u4ee5\u53d1\u73b0DOM\u548cReact\u7684\u8bbe\u8ba1\u975e\u5e38\u76f8\u4f3c\u3002<\/p>\n
\u6307\u5b9a\u8bfe\u7a0b\u540d\u79f0\u548c\u5185\u8054\u6837\u5f0f<\/h2>\n
HTML – HyperText Markup Language \u662f\u4e00\u79cd\u7528\u4e8e\u521b\u5efa\u7f51\u9875\u7684\u6807\u8bb0\u8bed\u8a00\u3002<\/h3>\n
<div<\/span> class=<\/span>\"your-name\"<\/span> style=<\/span>\"color: #FF0000;\"<\/span>><\/span>\r\n  Hello World!\r\n<\/div><\/span>\r\n<\/code><\/pre>\n
DOM\uff08\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff09<\/h2>\n
element.className \u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u6240\u4ee5\u5b83\u7684\u683c\u5f0f\u4e0e React \u76f8\u540c\u3002
\n\u7136\u800c\uff0c\u4e0d\u80fd\u76f4\u63a5\u5c06\u5bf9\u8c61\u8d4b\u503c\u7ed9 element.style \u5e76\u5e94\u7528\u6837\u5f0f\u3002<\/p>\n
const<\/span> element<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>div<\/span>'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\r\nelement<\/span>.<\/span>style<\/span>.<\/span>color<\/span> =<\/span> '<\/span>#00FF00<\/span>'<\/span>;<\/span>\r\nelement<\/span>.<\/span>className<\/span> =<\/span> '<\/span>another-class-name<\/span>'<\/span>;<\/span>\r\n<\/code><\/pre>\n
React \/ JSX \u53cd\u5e94\/ JSX<\/h3>\n
\u4f3c\u4e4eVue+JSX\u7684\u5199\u6cd5\u51e0\u4e4e\u76f8\u540c\u3002<\/p>\n
<<\/span>div<\/span> className<\/span>=<\/span>\"your-class-name\"<\/span> style<\/span>=<\/span>{<\/span>{<\/span> '<\/span>color<\/span>'<\/span>:<\/span> '<\/span>#FF0000<\/span>'<\/span> }<\/span>}<\/span>><\/span>\r\n  Hello World!\r\n<\/<\/span>div<\/span>><\/span>\r\n<\/code><\/pre>\n
Vue.js – \u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\u7684\u539f\u751f\u4e2d\u6587\u91ca\u4e49\uff1aVue.js<\/h2>\n
\u5728Vue\u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528v-bind\uff1a\u6765\u7f16\u5199JavaScript\u4ee3\u7801\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e0e\u5e38\u89c4HTML\u76f8\u540c\u7684\u5199\u6cd5\u3002<\/p>\n
<div<\/span> class=<\/span>\"your-name\"<\/span> style=<\/span>\"color: #FF0000\"<\/span>><\/span>\r\n  Hello World!\r\n<\/div><\/span>\r\n\u307e\u305f\u306f\r\n<div<\/span> v-bind:class=<\/span>\"dynamicClass\"<\/span>\r\n     v-bind:style=<\/span>\"{ color: dynamicColor }\"<\/span>><\/span>\r\n  Dynamic Attributes!\r\n<\/div><\/span>\r\n<\/code><\/pre>\n
\u8868\u5355\u5143\u7d20<\/h2>\n
HTML (\u8d85\u6587\u672c\u6807\u8bb0\u8bed\u8a00) \u53ef\u4ee5\u7528\u6765\u521b\u5efa\u548c\u7ec4\u7ec7\u7f51\u9875\u5185\u5bb9\u3002<\/h3>\n
<select><\/span>\r\n  <option<\/span> value=<\/span>\"apple\"<\/span>><\/span>\u308a\u3093\u3054<\/option><\/span>\r\n  <option<\/span> value=<\/span>\"orange\"<\/span> selected<\/span>><\/span>\u307f\u304b\u3093<\/option><\/span>\r\n<\/select><\/span>\r\n<textarea><\/span>Hello World<\/textarea><\/span>\r\n<input<\/span> type=<\/span>\"checkbox\"<\/span> checked<\/span> \/><\/span>\u30c1\u30a7\u30c3\u30af\u30dc\u30c3\u30af\u30b9\r\n<\/code><\/pre>\n
DOM – \u6587\u6863\u5bf9\u8c61\u6a21\u578b<\/h2>\n
const<\/span> selectElement<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>select<\/span>'<\/span>)[<\/span>0<\/span>];<\/span>\r\nconst<\/span> textareaElement<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>textarea<\/span>'<\/span>)[<\/span>0<\/span>];<\/span>\r\nconst<\/span> checkboxElement<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>input[type=\"checkbox\"]<\/span>'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\r\nselectElement<\/span>.<\/span>value<\/span> =<\/span> \"<\/span>apple<\/span>\"<\/span>;<\/span>\r\ntextareaElement<\/span>.<\/span>value<\/span> =<\/span> \"<\/span>Enjoy JavaScript!<\/span>\"<\/span>;<\/span>\r\ncheckboxElement<\/span>.<\/span>checked<\/span> =<\/span> false<\/span>;<\/span>\r\n<\/code><\/pre>\n
React \/ JSX \u53cd\u5e94\/\u7b80\u5355 JavaScript XML<\/h3>\n
<<\/span>select<\/span> value<\/span>=<\/span>{<\/span>myFruit<\/span>}<\/span>><\/span>\r\n  <<\/span>option<\/span> value<\/span>=<\/span>\"apple\"<\/span>><\/span>\u308a\u3093\u3054<\/<\/span>option<\/span>><\/span>\r\n  <<\/span>option<\/span> value<\/span>=<\/span>\"orange\"<\/span>><\/span>\u307f\u304b\u3093<\/<\/span>option<\/span>><\/span>\r\n<\/<\/span>select<\/span>><\/span>\r\n<<\/span>textarea<\/span> value<\/span>=<\/span>{<\/span>myText<\/span>}<\/span> \/><\/span>\r\n<<\/span>input<\/span> type<\/span>=<\/span>\"checkbox\"<\/span> checked<\/span>=<\/span>{<\/span>isChecked<\/span>}<\/span> \/><\/span>\u30c1\u30a7\u30c3\u30af\u30dc\u30c3\u30af\u30b9<\/span>\r\n<\/code><\/pre>\n
Vue<\/h3>\n
<select<\/span> v-bind:value=<\/span>\"myFruit\"<\/span>><\/span>\r\n  <option<\/span> value=<\/span>\"apple\"<\/span>><\/span>\u308a\u3093\u3054<\/option><\/span>\r\n  <option<\/span> value=<\/span>\"orange\"<\/span>><\/span>\u307f\u304b\u3093<\/option><\/span>\r\n<\/select><\/span>\r\n<textarea<\/span> v-bind:value=<\/span>\"myText\"<\/span> \/><\/span>\r\n<input<\/span> type=<\/span>\"checkbox\"<\/span> v-bind:checked=<\/span>\"isChecked\"<\/span> \/><\/span>\u30c1\u30a7\u30c3\u30af\u30dc\u30c3\u30af\u30b9\r\n<\/code><\/pre>\n
\u53e6\u5916\uff0c\u60a8\u4e5f\u53ef\u4ee5\u4f7f\u7528v-model\u6765\u5b9e\u73b0\u53cc\u5411\u6570\u636e\u7ed1\u5b9a\uff0c\u800c\u4e0d\u662f\u4f7f\u7528v-bind\u3002<\/p>\n
\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f<\/h2>\n
\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587\u8868\u8ff0\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff1a<\/h3>\n
HTML<\/p>\n
<form<\/span> action=<\/span>\".\/submit\"<\/span>\r\n      onSubmit=<\/span>\"console.log('submit'); return false;\"<\/span>><\/span>\r\n  <input<\/span> type=<\/span>\"text\"<\/span>\r\n         onChange=<\/span>\"console.log('change')\"<\/span>\r\n         onInput=<\/span>\"console.log('input')\"<\/span> \/><\/span>\r\n  <button<\/span> type=<\/span>\"submit\"<\/span>><\/span>\u9001\u4fe1<\/button><\/span>\r\n<\/form><\/span>\r\n<\/code><\/pre>\n
DOM (Document Object Model) \u662f\u4e00\u79cd\u7a0b\u5e8f\u63a5\u53e3\uff0c\u63d0\u4f9b\u4e86\u5bf9 HTML \u548c XML \u6587\u6863\u7684\u7ed3\u6784\u5316\u8868\u8fbe\u548c\u64cd\u4f5c\u65b9\u6cd5\u3002<\/h3>\n
\u5982\u679c\u4f7f\u7528addEventListener\uff0c\u5219\u4e0d\u80fd\u4f7f\u7528return false\u6765\u53d6\u6d88\u5904\u7406\u3002<\/p>\n
const<\/span> formElement<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>form<\/span>'<\/span>)[<\/span>0<\/span>];<\/span>\r\nconst<\/span> inputElement<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>input[type=\"text\"]<\/span>'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\r\ninputElement<\/span>.<\/span>addEventListener<\/span>(<\/span>\"<\/span>change<\/span>\"<\/span>,<\/span> ()<\/span> =><\/span> {<\/span> console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>change<\/span>'<\/span>);<\/span> });<\/span> \r\ninputElement<\/span>.<\/span>addEventListener<\/span>(<\/span>\"<\/span>input<\/span>\"<\/span>,<\/span> ()<\/span> =><\/span> {<\/span> console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>input<\/span>'<\/span>);<\/span> });<\/span> \r\nformElement<\/span>.<\/span>addEventListener<\/span>(<\/span>\"<\/span>submit<\/span>\"<\/span>,<\/span> (<\/span>e<\/span>)<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>submit<\/span>'<\/span>);<\/span>\r\n  e<\/span>.<\/span>preventDefault<\/span>();<\/span>\r\n});<\/span> \r\n<\/code><\/pre>\n
React \/ JSX \u53cd\u5e94 \/ JSX<\/h3>\n
\u8fd4\u56de false; \u4e0d\u80fd\u505c\u6b62\u8868\u5355\u63d0\u4ea4\u7684\u7279\u70b9\u4e0e DOM \u89c4\u8303\u7c7b\u4f3c\u3002\u4f46\u662f\uff0c\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7684\u4e0d\u662f\u5728 DOM \u4e2d\u5b9e\u73b0\u7684 Event\uff0c\u800c\u662f\u88ab\u79f0\u4e3a\u5408\u6210\u4e8b\u4ef6\u7684\u4e1c\u897f\u3002\u5373\u4f7f\u5982\u6b64\uff0c\u60a8\u4ecd\u7136\u53ef\u4ee5\u4f7f\u7528 e.preventDefault() \u6216 e.stopPropagation() \u7b49\u65b9\u6cd5\u3002<\/p>\n
\u53e6\u5916\uff0c\u5728\u6587\u672c\u6846\u4e2d\u7684onChange\u884c\u4e3a\u4e0eJavaScript\u7684onInput\u7c7b\u4f3c\uff0c\u6bcf\u8f93\u5165\u4e00\u4e2a\u5b57\u7b26\u5c31\u4f1a\u8c03\u7528\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002<\/p>\n
<<\/span>form<\/span> action<\/span>=<\/span>\".\/submit\"<\/span>\r\n      onSubmit<\/span>=<\/span>{<\/span>(<\/span>e<\/span>)<\/span> =><\/span> {<\/span> console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>submit<\/span>'<\/span>);<\/span> e<\/span>.<\/span>preventDefault<\/span>();<\/span> }<\/span>}<\/span>><\/span>\r\n  <<\/span>input<\/span> type<\/span>=<\/span>\"text\"<\/span>\r\n         onChange<\/span>=<\/span>{<\/span>()<\/span> =><\/span> {<\/span> console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>change<\/span>'<\/span>);<\/span> }<\/span>}<\/span> \/><\/span>\r\n  <<\/span>button<\/span> type<\/span>=<\/span>\"submit\"<\/span>><\/span>\u9001\u4fe1<\/<\/span>button<\/span>><\/span>\r\n<\/<\/span>form<\/span>><\/span>\r\n<\/code><\/pre>\n
Vue<\/h3>\n
\u53ef\u4ee5\u4f7f\u7528.prevent()\u51fd\u6570\u6765\u6a21\u62dfe.preventDefault()\u3002<\/p>\n
<form<\/span> action=<\/span>\".\/submit\"<\/span>\r\n      v-on:submit.prevent=<\/span>\"log += 'submit!'\"<\/span>><\/span>\r\n  <input<\/span> type=<\/span>\"text\"<\/span>\r\n         v-on:change=<\/span>\"log += 'change!'\"<\/span>\r\n         v-on:input=<\/span>\"log += 'input!'\"<\/span> \/><\/span>\r\n  <button<\/span> type=<\/span>\"submit\"<\/span>><\/span>\u9001\u4fe1<\/button><\/span>\r\n  <p><\/span>{{ log }}<\/p><\/span>\r\n<\/form><\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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