HTML CSS Bootstrap4（CSS，升级版）

头文件写法

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4.   <title>Bootstrap 实例</title>
  5.   <meta charset="utf-8">
  6.   <meta name="viewport" content="width=device-width, initial-scale=1">
  7.   <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
  8.   <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
  9.   <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
  10.   <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
  11. </head>
  12. <body>
  14. <div class="container">
  15.   <h2>基本样式</h2> 
  16. </div>
  18. </body>
  19. </html>

文件上传样式

背景颜色

image.png

  1. <div class="container">
  2.   <h2>背景颜色</h2>
  3.   <p class="bg-primary text-white">重要的背景颜色。</p>
  4.   <p class="bg-success text-white">执行成功背景颜色。</p>
  5.   <p class="bg-info text-white">信息提示背景颜色。</p>
  6.   <p class="bg-warning text-white">警告背景颜色</p>
  7.   <p class="bg-danger text-white">危险背景颜色。</p>
  8.   <p class="bg-secondary text-white">副标题背景颜色。</p>
  9.   <p class="bg-dark text-white">深灰背景颜色。</p>
  10.   <p class="bg-light text-dark">浅灰背景颜色。</p>
  11. </div>

按钮

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  1. <button type="button" class="btn">基本按钮</button>
  2. <button type="button" class="btn btn-primary">主要按钮</button>
  3. <button type="button" class="btn btn-secondary">次要按钮</button>
  4. <button type="button" class="btn btn-success">成功</button>
  5. <button type="button" class="btn btn-info">信息</button>
  6. <button type="button" class="btn btn-warning">警告</button>
  7. <button type="button" class="btn btn-danger">危险</button>
  8. <button type="button" class="btn btn-dark">黑色</button>
  9. <button type="button" class="btn btn-light">浅色</button>
  10. <button type="button" class="btn btn-link">链接</button>

按钮组

image.png

  1. <div class="container">
  2.   <h2>按钮组</h2>
  3.   <p> .btn-group 类用于创建按钮组:</p>
  4.   <div class="btn-group">
  5.     <button type="button" class="btn btn-primary">Apple</button>
  6.     <button type="button" class="btn btn-primary">Samsung</button>
  7.     <button type="button" class="btn btn-primary">Sony</button>
  8.   </div>
  9. </div>

垂直按钮

image.png

  1. <div class="container">
  2.   <h2>垂直按钮组</h2>
  3.   <p>U可以使用 .btn-group-vertical 类来创建垂直的按钮组：</p>
  4.   <div class="btn-group-vertical">
  5.     <button type="button" class="btn btn-primary">Apple</button>
  6.     <button type="button" class="btn btn-primary">Samsung</button>
  7.     <button type="button" class="btn btn-primary">Sony</button>
  8.   </div>
  9. </div>

内嵌下拉

image.png

  1. <div class="container">
  2.   <h2>内嵌按钮组</h2>
  3.   <p>按钮组设置下拉菜单:</p>
  4.   <div class="btn-group">
  5.     <button type="button" class="btn btn-primary">Apple</button>
  6.     <button type="button" class="btn btn-primary">Samsung</button>
  7.     <div class="btn-group">
  8.       <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
  9.       Sony
  10.       </button>
  11.       <div class="dropdown-menu">
  12.         <a class="dropdown-item" href="#">Tablet</a>
  13.         <a class="dropdown-item" href="#">Smartphone</a>
  14.       </div>
  15.     </div>
  16.   </div>
  17. </div>

内嵌垂直

image.png

  1. <div class="btn-group-vertical">
  2.   <button type="button" class="btn btn-primary">Apple</button>
  3.   <button type="button" class="btn btn-primary">Samsung</button>
  4.   <div class="btn-group">
  5.     <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
  6.        Sony
  7.     </button>
  8.     <div class="dropdown-menu">
  9.       <a class="dropdown-item" href="#">Tablet</a>
  10.       <a class="dropdown-item" href="#">Smartphone</a>
  11.     </div>
  12.   </div>
  13. </div>

徽章

药丸

image.png

  1. <div class="container">
  2.   <h2>药丸形状徽章</h2>
  3.   <span class="badge badge-pill badge-default">默认</span>
  4.   <span class="badge badge-pill badge-primary">主要</span>
  5.   <span class="badge badge-pill badge-success">成功</span>
  6.   <span class="badge badge-pill badge-info">信息</span>
  7.   <span class="badge badge-pill badge-warning">警告</span>
  8.   <span class="badge badge-pill badge-danger">危险</span>
  9. </div>

嵌入

image.png

  1. <div class="container">
  2.   <h2>徽章嵌入到按钮内</h2>
  3.   <button type="button" class="btn btn-primary">
  4.     Messages <span class="badge badge-light">4</span>
  5.   </button>
  6.   <button type="button" class="btn btn-danger">
  7.     Notifications <span class="badge badge-light">7</span>
  8.   </button>
  9. </div>

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