{"id":1888,"date":"2025-02-22T13:13:36","date_gmt":"2025-02-22T05:13:36","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1888"},"modified":"2025-02-22T13:13:36","modified_gmt":"2025-02-22T05:13:36","slug":"html-%e6%a0%b7%e5%bc%8f-css-cascading-style-sheets","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/22\/html-%e6%a0%b7%e5%bc%8f-css-cascading-style-sheets\/","title":{"rendered":"HTML \u6837\u5f0f – CSS (Cascading Style Sheets)"},"content":{"rendered":"\n

CSS<\/strong>\uff08\u5c42\u53e0\u6837\u5f0f\u8868\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u63cf\u8ff0 HTML \u6587\u6863\u5916\u89c2\u548c\u683c\u5f0f\u7684\u8bed\u8a00\u3002CSS \u63a7\u5236\u7f51\u9875\u7684\u6392\u7248\u3001\u989c\u8272\u3001\u5b57\u4f53\u3001\u5e03\u5c40\u4ee5\u53ca\u5176\u4ed6\u6837\u5f0f\u7279\u6027\uff0c\u5b83\u4f7f\u5f97\u7f51\u9875\u7684\u5185\u5bb9\u4e0e\u6837\u5f0f\u5206\u79bb\uff0c\u4ece\u800c\u63d0\u5347\u4e86\u7f51\u9875\u7684\u7075\u6d3b\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n\n\n\n

1. CSS \u57fa\u672c\u6982\u5ff5<\/strong><\/h3>\n\n\n\n

CSS \u4e3b\u8981\u901a\u8fc7\u9009\u62e9\u5668\uff08Selector\uff09\u6765\u5b9a\u4e49\u6837\u5f0f\uff0c\u5e76\u5e94\u7528\u4e8e HTML \u5143\u7d20\u3002\u9009\u62e9\u5668\u51b3\u5b9a\u4e86\u8981\u5e94\u7528\u6837\u5f0f\u7684 HTML \u5143\u7d20\uff0c\u6837\u5f0f\u5219\u901a\u8fc7\u5c5e\u6027\u548c\u5c5e\u6027\u503c\u6765\u5b9a\u4e49\u3002<\/p>\n\n\n\n

\u8bed\u6cd5\uff1a<\/h4>\n\n\n\n
selector {\n    property: value;\n}<\/code><\/pre>\n\n\n\n
    \n
  • \u9009\u62e9\u5668\uff08Selector\uff09<\/strong>\uff1a\u6307\u5b9a\u8981\u5e94\u7528\u6837\u5f0f\u7684 HTML \u5143\u7d20\u3002<\/li>\n\n\n\n
  • \u5c5e\u6027\uff08Property\uff09<\/strong>\uff1a\u8981\u5e94\u7528\u7684\u6837\u5f0f\u7c7b\u578b\uff0c\u4f8b\u5982 color<\/code>, font-size<\/code>\u3002<\/li>\n\n\n\n
  • \u5c5e\u6027\u503c\uff08Value\uff09<\/strong>\uff1a\u5c5e\u6027\u7684\u5177\u4f53\u503c\uff0c\u4f8b\u5982 red<\/code>, 16px<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
    2. CSS \u7684\u4f7f\u7528\u65b9\u6cd5<\/strong><\/h3>\n\n\n\n
    CSS \u53ef\u4ee5\u901a\u8fc7\u4e09\u79cd\u65b9\u5f0f\u5e94\u7528\u4e8e HTML\uff1a<\/p>\n\n\n\n
      \n
    1. \u5185\u8054\u6837\u5f0f\uff08Inline CSS\uff09<\/strong>\uff1a\u76f4\u63a5\u5728 HTML \u5143\u7d20\u4e2d\u4f7f\u7528 style<\/code> \u5c5e\u6027\u5b9a\u4e49\u6837\u5f0f\u3002<\/li>\n\n\n\n
    2. \u5185\u90e8\u6837\u5f0f\u8868\uff08Internal CSS\uff09<\/strong>\uff1a\u5728 HTML \u6587\u6863\u7684 <head><\/code> \u6807\u7b7e\u4e2d\u4f7f\u7528 <style><\/code> \u6807\u7b7e\u5d4c\u5165 CSS\u3002<\/li>\n\n\n\n
    3. \u5916\u90e8\u6837\u5f0f\u8868\uff08External CSS\uff09<\/strong>\uff1a\u901a\u8fc7\u94fe\u63a5\u5916\u90e8\u7684 .css<\/code> \u6587\u4ef6\u6765\u5f15\u5165\u6837\u5f0f\u3002<\/li>\n<\/ol>\n\n\n\n
      1. \u5185\u8054\u6837\u5f0f\uff08Inline CSS\uff09<\/strong><\/h4>\n\n\n\n
      <p style=\"color: blue; font-size: 16px;\">\u8fd9\u662f\u4e00\u4e2a\u6bb5\u843d\u3002<\/p><\/code><\/pre>\n\n\n\n
      2. \u5185\u90e8\u6837\u5f0f\u8868\uff08Internal CSS\uff09<\/strong><\/h4>\n\n\n\n
      <head>\n    <style>\n        p {\n            color: blue;\n            font-size: 16px;\n        }\n    <\/style>\n<\/head><\/code><\/pre>\n\n\n\n
      3. \u5916\u90e8\u6837\u5f0f\u8868\uff08External CSS\uff09<\/strong><\/h4>\n\n\n\n
      \u5728 HTML \u6587\u4ef6\u4e2d\u901a\u8fc7 <link><\/code> \u6807\u7b7e\u5f15\u5165\u5916\u90e8\u7684 CSS \u6587\u4ef6\uff1a<\/p>\n\n\n\n
      <head>\n    <link rel=\"stylesheet\" href=\"styles.css\">\n<\/head><\/code><\/pre>\n\n\n\n
      \u5728 styles.css<\/code> \u6587\u4ef6\u4e2d\u5b9a\u4e49\u6837\u5f0f\uff1a<\/p>\n\n\n\n
      p {\n    color: blue;\n    font-size: 16px;\n}<\/code><\/pre>\n\n\n\n
      3. \u5e38\u89c1\u7684 CSS \u5c5e\u6027<\/strong><\/h3>\n\n\n\n
      1. \u6587\u672c\u548c\u5b57\u4f53\u6837\u5f0f<\/strong><\/h4>\n\n\n\n
        \n
      • color<\/strong>\uff1a\u8bbe\u7f6e\u6587\u672c\u989c\u8272\u3002<\/li>\n\n\n\n
      • font-family<\/strong>\uff1a\u8bbe\u7f6e\u5b57\u4f53\u3002<\/li>\n\n\n\n
      • font-size<\/strong>\uff1a\u8bbe\u7f6e\u5b57\u4f53\u5927\u5c0f\u3002<\/li>\n\n\n\n
      • font-weight<\/strong>\uff1a\u8bbe\u7f6e\u5b57\u4f53\u7c97\u7ec6\u3002<\/li>\n\n\n\n
      • text-align<\/strong>\uff1a\u8bbe\u7f6e\u6587\u672c\u5bf9\u9f50\u65b9\u5f0f\u3002<\/li>\n<\/ul>\n\n\n\n
        \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
        h1 {\n    color: green;\n    font-family: Arial, sans-serif;\n    font-size: 36px;\n    font-weight: bold;\n    text-align: center;\n}<\/code><\/pre>\n\n\n\n
        2. \u80cc\u666f\u6837\u5f0f<\/strong><\/h4>\n\n\n\n
          \n
        • background-color<\/strong>\uff1a\u8bbe\u7f6e\u80cc\u666f\u989c\u8272\u3002<\/li>\n\n\n\n
        • background-image<\/strong>\uff1a\u8bbe\u7f6e\u80cc\u666f\u56fe\u7247\u3002<\/li>\n\n\n\n
        • background-size<\/strong>\uff1a\u8bbe\u7f6e\u80cc\u666f\u56fe\u7247\u7684\u5c3a\u5bf8\u3002<\/li>\n<\/ul>\n\n\n\n
          \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
          body {\n    background-color: #f0f0f0;\n}\ndiv {\n    background-image: url('background.jpg');\n    background-size: cover;\n}<\/code><\/pre>\n\n\n\n
          3. \u76d2\u5b50\u6a21\u578b\u5c5e\u6027<\/strong><\/h4>\n\n\n\n
            \n
          • width<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u7684\u5bbd\u5ea6\u3002<\/li>\n\n\n\n
          • height<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u7684\u9ad8\u5ea6\u3002<\/li>\n\n\n\n
          • padding<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u5185\u5bb9\u4e0e\u8fb9\u6846\u4e4b\u95f4\u7684\u95f4\u8ddd\u3002<\/li>\n\n\n\n
          • border<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u7684\u8fb9\u6846\u6837\u5f0f\u3001\u5bbd\u5ea6\u548c\u989c\u8272\u3002<\/li>\n\n\n\n
          • margin<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u4e0e\u5468\u56f4\u5143\u7d20\u4e4b\u95f4\u7684\u95f4\u8ddd\u3002<\/li>\n<\/ul>\n\n\n\n
            \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
            div {\n    width: 300px;\n    height: 200px;\n    padding: 20px;\n    border: 2px solid black;\n    margin: 10px;\n}<\/code><\/pre>\n\n\n\n
            4. \u5e03\u5c40\u5c5e\u6027<\/strong><\/h4>\n\n\n\n
              \n
            • display<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u7684\u663e\u793a\u7c7b\u578b\uff08\u5982 block<\/code>, inline<\/code>, flex<\/code>\uff09\u3002<\/li>\n\n\n\n
            • position<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u7684\u4f4d\u7f6e\uff08\u5982 static<\/code>, relative<\/code>, absolute<\/code>, fixed<\/code>\uff09\u3002<\/li>\n\n\n\n
            • float<\/strong>\uff1a\u8ba9\u5143\u7d20\u5de6\u53f3\u6d6e\u52a8\u3002<\/li>\n\n\n\n
            • clear<\/strong>\uff1a\u9632\u6b62\u5143\u7d20\u88ab\u6d6e\u52a8\u5143\u7d20\u8986\u76d6\u3002<\/li>\n<\/ul>\n\n\n\n
              \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
              .container {\n    display: flex;\n    justify-content: space-between;\n    align-items: center;\n}<\/code><\/pre>\n\n\n\n
              5. \u8fb9\u6846\u548c\u5706\u89d2<\/strong><\/h4>\n\n\n\n
                \n
              • border-radius<\/strong>\uff1a\u8bbe\u7f6e\u5143\u7d20\u7684\u5706\u89d2\u3002<\/li>\n\n\n\n
              • border-width<\/strong>\uff1a\u8bbe\u7f6e\u8fb9\u6846\u5bbd\u5ea6\u3002<\/li>\n\n\n\n
              • border-style<\/strong>\uff1a\u8bbe\u7f6e\u8fb9\u6846\u7684\u6837\u5f0f\uff08\u5982 solid<\/code>, dotted<\/code>, dashed<\/code>\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
                \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
                div {\n    border-radius: 10px;\n    border: 2px solid #000;\n}<\/code><\/pre>\n\n\n\n
                4. CSS \u9009\u62e9\u5668<\/strong><\/h3>\n\n\n\n
                CSS \u9009\u62e9\u5668\u7528\u4e8e\u9009\u62e9\u7f51\u9875\u4e2d\u7684 HTML \u5143\u7d20\uff0c\u5e76\u4e3a\u5b83\u4eec\u5e94\u7528\u6837\u5f0f\u3002\u5e38\u89c1\u7684\u9009\u62e9\u5668\u5305\u62ec\uff1a<\/p>\n\n\n\n
                1. \u5143\u7d20\u9009\u62e9\u5668<\/strong><\/h4>\n\n\n\n
                \u9009\u62e9\u6240\u6709\u6307\u5b9a\u6807\u7b7e\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n
                p {\n    color: red;\n}<\/code><\/pre>\n\n\n\n
                2. \u7c7b\u9009\u62e9\u5668<\/strong><\/h4>\n\n\n\n
                \u9009\u62e9\u6240\u6709\u5177\u6709\u6307\u5b9a\u7c7b\u540d\u7684\u5143\u7d20\u3002\u4f7f\u7528 .<\/code> \u524d\u7f00\u3002<\/p>\n\n\n\n
                .classname {\n    color: blue;\n}<\/code><\/pre>\n\n\n\n
                3. ID \u9009\u62e9\u5668<\/strong><\/h4>\n\n\n\n
                \u9009\u62e9\u5177\u6709\u6307\u5b9a ID \u7684\u5143\u7d20\u3002\u4f7f\u7528 #<\/code> \u524d\u7f00\u3002<\/p>\n\n\n\n
                #idname {\n    color: green;\n}<\/code><\/pre>\n\n\n\n
                4. \u540e\u4ee3\u9009\u62e9\u5668<\/strong><\/h4>\n\n\n\n
                \u9009\u62e9\u6307\u5b9a\u5143\u7d20\u7684\u6240\u6709\u540e\u4ee3\u5143\u7d20\u3002<\/p>\n\n\n\n
                div p {\n    color: purple;\n}<\/code><\/pre>\n\n\n\n
                5. \u4f2a\u7c7b\u9009\u62e9\u5668<\/strong><\/h4>\n\n\n\n
                \u9009\u62e9\u5143\u7d20\u7684\u7279\u6b8a\u72b6\u6001\uff0c\u5982\u9f20\u6807\u60ac\u505c\u72b6\u6001\u3002<\/p>\n\n\n\n
                a:hover {\n    color: red;\n}<\/code><\/pre>\n\n\n\n
                6. \u4f2a\u5143\u7d20\u9009\u62e9\u5668<\/strong><\/h4>\n\n\n\n
                \u9009\u62e9\u5143\u7d20\u7684\u7279\u5b9a\u90e8\u5206\uff0c\u5982\u6587\u672c\u7684\u7b2c\u4e00\u5b57\u6bcd\u3002<\/p>\n\n\n\n
                p::first-letter {\n    font-size: 2em;\n}<\/code><\/pre>\n\n\n\n
                5. CSS \u4f18\u5148\u7ea7<\/strong><\/h3>\n\n\n\n
                \u5728 CSS \u4e2d\uff0c\u6837\u5f0f\u7684\u4f18\u5148\u7ea7\u9075\u5faa\u4e00\u5b9a\u7684\u89c4\u5219\u3002\u5f53\u591a\u4e2a\u6837\u5f0f\u5e94\u7528\u4e8e\u540c\u4e00\u5143\u7d20\u65f6\uff0c\u4f18\u5148\u7ea7\u51b3\u5b9a\u4e86\u54ea\u4e2a\u6837\u5f0f\u6700\u7ec8\u751f\u6548\u3002<\/p>\n\n\n\n
                  \n
                • \u5185\u8054\u6837\u5f0f<\/strong>\u4f18\u5148\u7ea7\u6700\u9ad8\u3002<\/li>\n\n\n\n
                • ID \u9009\u62e9\u5668<\/strong>\u7684\u4f18\u5148\u7ea7\u6bd4\u7c7b\u9009\u62e9\u5668\u548c\u5143\u7d20\u9009\u62e9\u5668\u9ad8\u3002<\/li>\n\n\n\n
                • \u7c7b\u9009\u62e9\u5668<\/strong>\u7684\u4f18\u5148\u7ea7\u6bd4\u5143\u7d20\u9009\u62e9\u5668\u9ad8\u3002<\/li>\n<\/ul>\n\n\n\n
                  6. CSS \u5c42\u53e0\u4e0e\u7ee7\u627f<\/strong><\/h3>\n\n\n\n
                    \n
                  • \u5c42\u53e0\uff08Cascade\uff09<\/strong>\uff1aCSS \u7684\u201c\u5c42\u53e0\u201d\u6307\u7684\u662f\u6837\u5f0f\u7684\u5e94\u7528\u987a\u5e8f\uff0c\u540e\u5b9a\u4e49\u7684\u6837\u5f0f\u4f1a\u8986\u76d6\u524d\u9762\u7684\u6837\u5f0f\u3002<\/li>\n\n\n\n
                  • \u7ee7\u627f\uff08Inheritance\uff09<\/strong>\uff1a\u4e00\u4e9b CSS \u5c5e\u6027\u4f1a\u88ab\u5b50\u5143\u7d20\u7ee7\u627f\uff0c\u4f8b\u5982 color<\/code>\u3001font-family<\/code> \u7b49\u3002<\/li>\n<\/ul>\n\n\n\n
                    7. \u54cd\u5e94\u5f0f\u8bbe\u8ba1<\/strong><\/h3>\n\n\n\n
                    \u54cd\u5e94\u5f0f\u8bbe\u8ba1\u4f7f\u7528\u5a92\u4f53\u67e5\u8be2\uff08Media Queries\uff09\u6765\u6839\u636e\u5c4f\u5e55\u5927\u5c0f\u6216\u8bbe\u5907\u7c7b\u578b\u8c03\u6574\u7f51\u9875\u5e03\u5c40\u548c\u6837\u5f0f\u3002\u5e38\u89c1\u7684\u5a92\u4f53\u67e5\u8be2\u6761\u4ef6\u5305\u62ec\u5c4f\u5e55\u5bbd\u5ea6\u3001\u9ad8\u5ea6\u3001\u5206\u8fa8\u7387\u7b49\u3002<\/p>\n\n\n\n
                    \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
                    @media screen and (max-width: 600px) {\n    body {\n        background-color: lightblue;\n    }\n}<\/code><\/pre>\n\n\n\n
                    \u603b\u7ed3<\/h3>\n\n\n\n
                      \n
                    • CSS<\/strong> \u7528\u4e8e\u63a7\u5236\u7f51\u9875\u7684\u5916\u89c2\uff0c\u6d89\u53ca\u6587\u672c\u3001\u80cc\u666f\u3001\u5e03\u5c40\u3001\u5c3a\u5bf8\u7b49\u591a\u4e2a\u65b9\u9762\u3002<\/li>\n\n\n\n
                    • \u6837\u5f0f\u53ef\u4ee5\u901a\u8fc7 \u5185\u8054\u6837\u5f0f<\/strong>\u3001\u5185\u90e8\u6837\u5f0f\u8868<\/strong> \u548c \u5916\u90e8\u6837\u5f0f\u8868<\/strong> \u6765\u5b9a\u4e49\u3002<\/li>\n\n\n\n
                    • \u5e38\u7528\u7684 CSS \u5c5e\u6027\u5305\u62ec\u6587\u672c\u6837\u5f0f\u3001\u80cc\u666f\u3001\u5e03\u5c40\u3001\u8fb9\u6846\u3001\u5706\u89d2\u3001\u4f4d\u7f6e\u7b49\u3002<\/li>\n\n\n\n
                    • CSS \u9009\u62e9\u5668\u7528\u4e8e\u9009\u62e9\u5e76\u4e3a HTML \u5143\u7d20\u5e94\u7528\u6837\u5f0f\uff0c\u53ef\u4ee5\u662f\u5143\u7d20\u3001\u7c7b\u3001ID \u9009\u62e9\u5668\uff0c\u6216\u8005\u4f7f\u7528\u66f4\u590d\u6742\u7684\u7ec4\u5408\u9009\u62e9\u5668\u3002<\/li>\n\n\n\n
                    • \u901a\u8fc7\u5a92\u4f53\u67e5\u8be2\u53ef\u4ee5\u5b9e\u73b0\u54cd\u5e94\u5f0f\u8bbe\u8ba1\uff0c\u786e\u4fdd\u7f51\u9875\u5728\u5404\u79cd\u8bbe\u5907\u4e0a\u826f\u597d\u663e\u793a\u3002<\/li>\n<\/ul>\n\n\n\n
                      CSS \u662f\u524d\u7aef\u5f00\u53d1\u7684\u6838\u5fc3\u6280\u80fd\u4e4b\u4e00\uff0c\u638c\u63e1\u5b83\u80fd\u591f\u8ba9\u4f60\u8bbe\u8ba1\u51fa\u7f8e\u89c2\u3001\u7075\u6d3b\u4e14\u54cd\u5e94\u5f0f\u7684\u7f51\u9875\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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