{"id":4792,"date":"2022-03-27T21:07:23","date_gmt":"2022-03-27T13:07:23","guid":{"rendered":"https:\/\/egonlin.com\/?p=4792"},"modified":"2022-03-27T21:07:23","modified_gmt":"2022-03-27T13:07:23","slug":"%e7%ac%ac%e5%9b%9b%e8%8a%82%ef%bc%9acss3%e9%80%89%e6%8b%a9%e5%99%a8","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=4792","title":{"rendered":"\u7b2c\u56db\u8282\uff1acss3\u9009\u62e9\u5668"},"content":{"rendered":"

css\u9009\u62e9\u5668<\/h1>\n

css\u9009\u62e9\u5668\u672c\u8d28\u5c31\u662fcss\u4e0ehtml\u4e24\u79cd\u8bed\u6cd5\u5efa\u7acb\u5173\u8054\u7684\u7279\u5b9a\u6807\u8bc6\u7b26\uff1a<\/p>\n

\u5c31\u662f\u5728css\u8bed\u6cd5\u4e2d\uff0c\u901a\u8fc7html\u4e2d\u6807\u7b7e\u7684\u67d0\u79cd\u540d\u5b57\uff0c\u4e0ehtml\u5177\u4f53\u7684\u6807\u7b7e\u5efa\u7acb\u5173\u8054\uff0c\u4ece\u800c\u4f7f\u5199\u5728\u5bf9\u5e94css\u9009\u62e9\u5668\u540e\u7684css\u6837\u5f0f\u80fd\u63a7\u5236html\u4e2d\u5173\u8054\u7684\u6807\u7b7e\u6216\u6807\u7b7e\u4eec<\/p>\n

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1\u3001\u57fa\u7840\u9009\u62e9\u5668<\/h2>\n

1-1 \u901a\u914d\u9009\u62e9\u5668<\/h3>\n
\/* \u7279\u5b9a\u6807\u8bc6\u7b26 \u661f\u53f7(*) -- \u53ef\u4ee5\u8868\u793a\u9875\u9762\u6240\u6709\u6807\u7b7e\u7684\u540d\u5b57 *\/\n\/* \u901a\u914d\u9009\u62e9\u5668\u63a7\u5236\u9875\u9762\u4e2d\u6240\u6709\u7684\u6807\u7b7e(\u4e0d\u5efa\u8bae\u4f7f\u7528) *\/\n* {\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
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1-2 \u6807\u7b7e\u9009\u62e9\u5668<\/h3>\n
\/* \u7279\u5b9a\u6807\u8bc6\u7b26 \u6807\u7b7e\u540d *\/\n\/* \u6807\u7b7e\u9009\u62e9\u5668\u63a7\u5236\u9875\u9762\u4e2d\u6807\u7b7e\u540d\u4e3a\u6807\u7b7e\u9009\u62e9\u5668\u540d\u7684\u6240\u6709\u6807\u7b7e*\/\ndiv { \/* \u63a7\u5236\u9875\u9762\u4e2d\u6240\u6709div\u6807\u7b7e\u7684\u6837\u5f0f *\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
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1-3 class\u9009\u62e9\u5668\uff08\u63d0\u5021\u4f7f\u7528\uff09<\/h3>\n
\/* \u7279\u5b9a\u6807\u8bc6\u7b26 \u70b9(.) *\/\n\/* class\u9009\u62e9\u5668\u63a7\u5236\u9875\u9762\u4e2d\u6807\u7b7e\u5168\u5c40\u5c5e\u6027class\u503c\u4e3aclass\u62e9\u5668\u540d\u7684\u6240\u6709\u6807\u7b7e*\/\n.box { \/* \u63a7\u5236\u9875\u9762\u4e2d\u6240\u6709\u6807\u7b7e\u5168\u5c40\u5c5e\u6027class\u503c\u4e3abox\u6807\u7b7e\u7684\u6837\u5f0f *\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
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1-4 id\u9009\u62e9\u5668<\/h3>\n
\/* \u7279\u5b9a\u6807\u8bc6\u7b26 \u4e95\u53f7(#) *\/\n\/* id\u9009\u62e9\u5668\u63a7\u5236\u9875\u9762\u4e2d\u6807\u7b7e\u5168\u5c40\u5c5e\u6027id\u503c\u4e3aid\u62e9\u5668\u540d\u7684\u552f\u4e00\u6807\u7b7e*\/\n#box { \/* \u63a7\u5236\u9875\u9762\u4e2d\u552f\u4e00\u6807\u7b7e\u5168\u5c40\u5c5e\u6027id\u503c\u4e3abox\u6807\u7b7e\u7684\u6837\u5f0f *\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
<!-- \u9875\u9762\u4e2did\u5c5e\u6027\u503c\u4e3abox\u7684\u552f\u4e00\u6807\u7b7e\u5907\u5339\u914d\uff0cid\u5177\u6709\u552f\u4e00\u6027\uff1a\u4e00\u4e2a\u9875\u9762\u4e2d\u6240\u6709\u6807\u7b7e\u7684id\u5c5e\u6027\u503c\u4e0d\u80fd\u91cd\u540d -->\n<div id="box"><\/div><\/code><\/pre>\n
1-5 \u57fa\u7840\u9009\u62e9\u5668\u4f18\u5148\u7ea7<\/h3>\n
\u5728\u4e00\u4e2a\u9875\u9762\u4e2d\uff0c\u96be\u514d\u4f1a\u51fa\u73b0\u9875\u9762\u4e2d\u7684\u67d0\u4e00\u4e2a\u6807\u7b7e\u7684\u67d0\u4e00\u4e2a\u6837\u5f0f\u88ab\u4e0d\u540c\u7684\u9009\u62e9\u5668\u4e0b\u7684\u6837\u5f0f\u540c\u65f6\u63a7\u5236\uff0c\u4e5f\u5c31\u662f\u51fa\u73b0\u4e86\u591a\u79cd\u65b9\u5f0f\u4e0b\u5bf9\u76ee\u6807\u6807\u7b7e\u7684\u540c\u4e00\u6837\u5f0f\u51fa\u73b0\u4e86\u91cd\u590d\u63a7\u5236\uff0c\u90a3\u5230\u5e95\u662f\u54ea\u79cd\u9009\u62e9\u5668\u4e0b\u7684\u6837\u5f0f\u6700\u7ec8\u63a7\u5236\u4e86\u76ee\u6807\u6807\u7b7e\uff0c\u4e00\u5b9a\u4f1a\u6709\u4e00\u5957\u7531\u5f31\u5230\u5f3a\u7684\u63a7\u5236\u7ea7\u522b\u89c4\u5219\uff0c\u8fd9\u79cd\u89c4\u5219\u5c31\u53eb\u505a\u4f18\u5148\u7ea7\uff0c\u4e0b\u9762\u7684\u4f8b\u5b50\u5c31\u5f88\u597d\u7684\u89e3\u91ca\u4e86\u5404\u79cd\u57fa\u7840\u9009\u62e9\u5668\u7684\u4f18\u5148\u7ea7\u5173\u7cfb\uff1a<\/p>\n
<head>\n    <style>\n        * {\n            width: 50px;\n            height: 50px;\n            background-color: red;\n            color: pink;\n        }\n        div {\n            width: 60px;\n            height: 60px;\n            background-color: orange;\n        }\n        .box {\n            width: 70px;\n            height: 70px;\n        }\n        #ele {\n            width: 80px;\n        }\n    <\/style>\n<\/head>\n<body>\n    <div class="box" id="ele">\u6587\u5b57\u5185\u5bb9<\/div>\n<\/body>\n<!--\n1. \u56db\u79cd\u9009\u62e9\u5668\u90fd\u63a7\u5236\u76ee\u6807\u6807\u7b7e\u7684\u5bbd\u5ea6\uff0c\u6700\u7ec8\u76ee\u6807\u6807\u7b7e\u5bbd\u5ea6\u4e3a80px\uff0c\u6240\u4ee5id\u9009\u62e9\u5668\u4f18\u5148\u7ea7\u6700\u9ad8\n2. \u4e09\u79cd\u9009\u62e9\u5668\u90fd\u63a7\u5236\u76ee\u6807\u6807\u7b7e\u7684\u9ad8\u5ea6\uff0c\u6700\u7ec8\u76ee\u6807\u6807\u7b7e\u5bbd\u5ea6\u4e3a70px\uff0c\u6240\u4ee5class\u9009\u62e9\u5668\u4f18\u5148\u7ea7\u5176\u6b21\n3. \u4e8c\u79cd\u9009\u62e9\u5668\u90fd\u63a7\u5236\u76ee\u6807\u6807\u7b7e\u7684\u80cc\u666f\u989c\u8272\uff0c\u6700\u7ec8\u76ee\u6807\u6807\u7b7e\u80cc\u666f\u989c\u8272\u4e3aorange\uff0c\u6240\u4ee5\u6807\u7b7e\u9009\u62e9\u5668\u4f18\u5148\u7ea7\u518d\u6b21\n4. \u53ea\u6709\u4e00\u79cd\u9009\u62e9\u5668\u63a7\u5236\u76ee\u6807\u6807\u7b7e\u7684\u5b57\u4f53\u989c\u8272\uff0c\u76ee\u6807\u6807\u7b7e\u5b57\u4f53\u989c\u8272\u4e00\u5b9a\u4e3apink\n\u4f18\u5148\u7ea7\uff1a\u901a\u914d\u9009\u62e9\u5668 < \u6807\u7b7e\u9009\u62e9\u5668 < class\u9009\u62e9\u5668 < id\u9009\u62e9\u5668\n--><\/code><\/pre>\n
2\u3001\u590d\u6742\u9009\u62e9\u5668<\/h2>\n
2-1 \u7fa4\u7ec4\u9009\u62e9\u5668<\/h3>\n
\/* \u8fde\u63a5\u6807\u8bc6\u7b26 \u9017\u53f7(,) *\/\n\/* \u7fa4\u7ec4\u9009\u62e9\u5668\u5c31\u662f\u4e00\u5957\u6837\u5f0f\u5757\u540c\u65f6\u63a7\u5236\u7528\u9017\u53f7\u8fde\u63a5(,)\u7684\u6240\u6709\u76ee\u6807\u6807\u7b7e *\/\ndiv, p, .box, #ele {\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
<!-- \u9875\u9762\u4e2d\u6240\u6709div\u6807\u7b7e\u3001\u6240\u6709p\u6807\u7b7e\u3001\u6240\u6709class\u5c5e\u6027\u503c\u4e3abox\u3001\u552f\u4e00id\u5c5e\u6027\u503c\u4e3aele\u7684\u6807\u7b7e\u90fd\u80fd\u88ab\u5339\u914d -->\n<div>\n    <div><\/div>\n<\/div>\n<p><\/p>\n<p><\/p>\n<i class="box"><\/i>\n<span class="box"><\/span>\n<b id="ele"><\/b><\/code><\/pre>\n
2-2 \u540e\u4ee3\u9009\u62e9\u5668<\/h3>\n
\/* \u8fde\u63a5\u6807\u8bc6\u7b26 \u7a7a\u683c( ) *\/\n\/* \u540e\u4ee3\u9009\u62e9\u5668\u63a7\u5236\u7684\u662f\u6700\u540e\u7f6e\u7684\u9009\u62e9\u5668\u4f4d\u5339\u914d\u5230\u76ee\u6807\u6807\u7b7e(\u4eec)\uff0c\u524d\u7f6e\u4f4d\u7684\u6240\u6709\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970 *\/\nbody .box i { \/*\u6700\u540e\u7f6e\u4f4d\u7684\u9009\u62e9\u5668\u4e3ai\u6807\u7b7e\u9009\u62e9\u5668\uff0c\u524d\u7f6e\u4f4dbody\u6807\u7b7e\u9009\u62e9\u5668\u3001class\u503c\u4e3abox\u7684class\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970*\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
<!-- body\u6807\u7b7e\u5185\u90e8\u7684class\u5c5e\u6027\u503c\u4e3abox\u5185\u90e8\u7684i\u6807\u7b7e\u4eec\u90fd\u80fd\u88ab\u5339\u914d\uff0c\u6240\u4ee5\u53ea\u5339\u914di\u6807\u7b7e\uff0c\u5176\u4ed6\u90fd\u662f\u4fee\u9970 -->\n<body>\n    <div class='box'>\n        <span><i><\/i><\/span><!-- body\u4e0e.box\u662f\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c.box\u4e0ei\u662f\u95f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c\u80fd\u88ab\u5339\u914d -->\n    <\/div>\n    <div>\n        <span class='box'><i><\/i><\/span><!-- body\u4e0e.box\u662f\u95f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c.box\u4e0ei\u662f\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c\u80fd\u88ab\u5339\u914d -->\n    <\/div>\n<\/body>\n<!-- \u6807\u7b7e\u7684\u5d4c\u5957\u7ed3\u6784\u5f62\u6210\u7236\u5b50\u4ee3\u6807\u7b7e\uff0c\u540e\u4ee3\u9009\u62e9\u5668\u53ef\u4ee5\u5339\u914d\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\u6216\u95f4\u8ddd\u7236\u5b50\u5173\u7cfb\u5f62\u6210\u7684\u5c42\u6b21\uff0c\u6240\u4ee5\u4e24\u4e2ai\u6807\u7b7e\u5747\u80fd\u88ab\u5339\u914d --><\/code><\/pre>\n
2-3 \u5b50\u4ee3\u9009\u62e9\u5668<\/h3>\n
\/* \u8fde\u63a5\u6807\u8bc6\u7b26 \u5927\u4e8e\u53f7(>) *\/\n\/* \u5b50\u4ee3\u9009\u62e9\u5668\u63a7\u5236\u7684\u662f\u6700\u540e\u7f6e\u7684\u9009\u62e9\u5668\u4f4d\u5339\u914d\u5230\u76ee\u6807\u6807\u7b7e(\u4eec)\uff0c\u524d\u7f6e\u4f4d\u7684\u6240\u6709\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970 *\/\nbody>.box>i { \/*\u6700\u540e\u7f6e\u4f4d\u7684\u9009\u62e9\u5668\u4e3ai\u6807\u7b7e\u9009\u62e9\u5668\uff0c\u524d\u7f6e\u4f4dbody\u6807\u7b7e\u9009\u62e9\u5668\u3001class\u503c\u4e3abox\u7684class\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970*\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
<!-- body>.box>i\uff1a\u540c\u7406body\u548c.box\u90fd\u662f\u4fee\u9970\u4f4d\uff0ci\u624d\u662f\u76ee\u6807\u5339\u914d\u4f4d -->\n<body>\n    <div class='box'>\n        <span><i><\/i><\/span><!-- body\u4e0e.box\u662f\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c.box\u4e0ei\u662f\u95f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c\u4e0d\u80fd\u88ab\u5339\u914d -->\n    <\/div>\n    <div>\n        <span class='box'><i><\/i><\/span><!-- body\u4e0e.box\u662f\u95f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c.box\u4e0ei\u662f\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c\u4e0d\u80fd\u88ab\u5339\u914d -->\n    <\/div>\n    <div class='box'>\n        <i><\/i><!-- body\u4e0e.box\u662f\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c.box\u4e0ei\u662f\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c\u80fd\u88ab\u5339\u914d -->\n    <\/div>\n<\/body>\n<!-- \u5b50\u4ee3\u9009\u62e9\u5668\u53ea\u80fd\u5339\u914d\u76f4\u63a5\u7236\u5b50\u5173\u7cfb\uff0c\u6240\u4ee5\u53ea\u80fd\u5339\u914d\u6700\u540e\u4e00\u4e2ai\u6807\u7b7e --><\/code><\/pre>\n
2-4 \u5144\u5f1f\u9009\u62e9\u5668<\/h3>\n
\/* \u8fde\u63a5\u6807\u8bc6\u7b26 \u6ce2\u6d6a\u53f7(~) *\/\n\/* \u5144\u5f1f\u9009\u62e9\u5668\u63a7\u5236\u7684\u662f\u6700\u540e\u7f6e\u7684\u9009\u62e9\u5668\u4f4d\u5339\u914d\u5230\u76ee\u6807\u6807\u7b7e(\u4eec)\uff0c\u524d\u7f6e\u4f4d\u7684\u6240\u6709\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970 *\/\n#ele~div~i { \/*\u6700\u540e\u7f6e\u4f4d\u7684\u9009\u62e9\u5668\u4e3ai\u6807\u7b7e\u9009\u62e9\u5668\uff0c\u524d\u7f6e\u4f4did\u503c\u4e3aele\u7684id\u9009\u62e9\u5668\u3001div\u6807\u7b7e\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970*\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
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2-5 \u76f8\u90bb\u9009\u62e9\u5668<\/h3>\n
\/* \u8fde\u63a5\u6807\u8bc6\u7b26 \u52a0\u53f7(+) *\/\n\/* \u76f8\u90bb\u9009\u62e9\u5668\u63a7\u5236\u7684\u662f\u6700\u540e\u7f6e\u7684\u9009\u62e9\u5668\u4f4d\u5339\u914d\u5230\u76ee\u6807\u6807\u7b7e(\u4eec)\uff0c\u524d\u7f6e\u4f4d\u7684\u6240\u6709\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970 *\/\n#ele+div+i { \/*\u6700\u540e\u7f6e\u4f4d\u7684\u9009\u62e9\u5668\u4e3ai\u6807\u7b7e\u9009\u62e9\u5668\uff0c\u524d\u7f6e\u4f4did\u503c\u4e3aele\u7684id\u9009\u62e9\u5668\u3001div\u6807\u7b7e\u9009\u62e9\u5668\u90fd\u662f\u4fee\u9970*\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
<!-- #ele+div+i\uff1a\u540c\u7406#ele\u548cdiv\u90fd\u662f\u4fee\u9970\u4f4d\uff0ci\u624d\u662f\u76ee\u6807\u5339\u914d\u4f4d -->\n<h3 id="ele"><\/h3>\n<div><\/div><!-- #ele\u4e0ediv\u662f\u76f4\u63a5\u5144\u5f1f\u5173\u7cfb -->\n<i><\/i><!-- div\u4e0ei\u662f\u76f4\u63a5\u5144\u5f1f\u5173\u7cfb\uff0c\u80fd\u88ab\u5339\u914d -->\n<div><\/div><!-- #ele\u4e0ediv\u662f\u95f4\u8ddd\u5144\u5f1f\u5173\u7cfb -->\n<i><\/i><!-- div\u4e0ei\u662f\u76f4\u63a5\u5144\u5f1f\u5173\u7cfb\uff0c\u4e0d\u80fd\u88ab\u5339\u914d -->\n<!-- \u76f8\u90bb\u9009\u62e9\u5668\u53ea\u80fd\u5339\u914d\u76f4\u63a5\u5144\u5f1f\u5173\u7cfb\uff0c\u6240\u4ee5\u53ea\u80fd\u5339\u914d\u7b2c\u4e00\u4e2ai\u6807\u7b7e --><\/code><\/pre>\n
2-6 \u4ea4\u53c9\u9009\u62e9\u5668<\/h3>\n
\/* \u8fde\u63a5\u6807\u8bc6\u7b26 \u7d27\u6328\u7740(\u6ca1\u6709\u4efb\u4f55\u8fde\u63a5\u7b26) *\/\n\/* \u4ea4\u53c9\u9009\u62e9\u5668\u672c\u8d28\u4e0a\u662f\u5bf9\u4e00\u4e2a\u76ee\u6807\u6807\u7b7e\u7684\u591a\u4e2a\u540d\u5b57\u7684\u540c\u65f6\u8868\u793a *\/\ndiv.box#ele.tag { \/*div\u662f\u6807\u7b7e\u540d\uff0cbox\u548ctag\u90fd\u662fclass\u5c5e\u6027\u503c\uff0cele\u662fid\u5c5e\u6027\u503c*\/\n    \/* \u6837\u5f0f\u5757 *\/\n}<\/code><\/pre>\n
<!-- \u6807\u7b7e\u540ddiv\u3001class\u540dbox\u53catag\u548cid\u540dele\u90fd\u662f\u5bf9\u4e00\u4e2a\u76ee\u6807\u6807\u7b7e\u7684\u4fee\u9970\u7a7a\u683c\u9694\u5f00\n<!-- class\u5c5e\u6027\u62e5\u6709\u591a\u4e2a\u503c\u65f6\uff0c\u591a\u4e2a\u503c\u4e4b\u95f4\u7528\u7a7a\u683c\u9694\u5f00 -->\n<div class="box tag" id="ele"><\/div><\/code><\/pre>\n
2=7 \u57fa\u7840\u9009\u62e9\u5668\u4f18\u5148\u7ea7<\/h3>\n
\u7b80\u5355\u9009\u62e9\u5668\u5b58\u5728\u4f18\u5148\u7ea7\uff0c\u4f18\u5148\u7ea7\u7684\u524d\u63d0\u5c31\u662f\u4e0d\u540c\u9009\u62e9\u5668\u540c\u65f6\u63a7\u5236\u540c\u4e00\u6807\u7b7e\u7684\u540c\u4e00\u5c5e\u6027<\/span>\uff0c\u90a3\u4e48\u5728\u590d\u6742\u9009\u62e9\u5668\u4e0b\uff0c\u4e00\u5b9a\u4f1a\u51fa\u73b0\u8fd9\u79cd\u540c\u65f6\u63a7\u5236\u540c\u4e00\u6807\u7b7e\u7684\u540c\u4e00\u5c5e\u6027\u60c5\u51b5\uff0c\u90a3\u590d\u6742\u9009\u62e9\u5668\u7684\u4f18\u5148\u7ea7\u53c8\u662f\u5982\u4f55\u6765\u89c4\u5b9a\u7684\u5462\uff1f<\/p>\n
1. \u590d\u6742\u9009\u62e9\u5668\u7684\u79cd\u7c7b\u5e76\u4e0d\u4f1a\u5f71\u54cd\u4f18\u5148\u7ea7\n    -- \u540e\u4ee3\uff1adiv #ele  |  \u5144\u5f1f\uff1adiv~#ele  |  \u4ea4\u53c9\uff1adiv#ele  \u4f18\u5148\u7ea7\u4e00\u6837\n2. \u590d\u6742\u9009\u62e9\u5668\u672c\u8d28\u662f\u901a\u8fc7\u540c\u7c7b\u578b(\u7b80\u5355\u9009\u62e9\u5668)\u7684\u4e2a\u6570\u6765\u786e\u5b9a\u4f18\u5148\u7ea7\n    -- \u4e09\u5c42\u6807\u7b7e\u9009\u62e9\u5668\u540e\u4ee3\uff1abody div i  \u5927\u4e8e  \u4e24\u5c42\u6807\u7b7e\u9009\u62e9\u5668\u540e\u4ee3\uff1adiv i  |  body i\n3. \u7b80\u5355\u9009\u62e9\u5668\u7684\u4f18\u5148\u7ea7\u8d77\u5173\u952e\u6027\u4f5c\u7528\uff0c\u4e5f\u5c31\u662f\u4e00\u4e2aid\u9009\u62e9\u5668\u8981\u5927\u4e8e\u65e0\u9650\u4e2aclass\u9009\u62e9\u5668\uff0c\u4e00\u4e2aclass\u9009\u62e9\u5668\u8981\u5927\u4e8e\u65e0\u9650\u4e2a\u6807\u7b7e\u9009\u62e9\u5668\n    -- id\u9009\u62e9\u5668\uff1a#i \u5927\u4e8e n\u5c42class\u9009\u62e9\u5668\uff1a.box .i\n    -- class\u9009\u62e9\u5668\uff1a.box \u5927\u4e8e n\u5c42\u6807\u7b7e\u9009\u62e9\u5668\uff1abody div<\/code><\/pre>\n
3\u3001\u603b\u7ed3<\/h2>\n
\u9009\u62e9\u5668\u662f\u4e00\u4e2a\u5e9e\u5927\u7684\u5bb6\u65cf\uff0c\u8fd8\u6709\u5f88\u591acss\u9009\u62e9\u5668\u7b49\u5f85\u5927\u5bb6\u81ea\u5df1\u53bb\u6316\u6398\uff0c\u638c\u63e1\u5df2\u4e0a\u9009\u62e9\u5668\u4e5f\u5df2\u8db3\u591f\u5e2e\u52a9\u6211\u4eec\u5b8c\u6210\u7b80\u5355\u524d\u7aef\u5f00\u53d1\u4e86<\/p>\n
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