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源代码：
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<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta content="width=device-width, initial-scale=1" name="viewport"> <link href="//cdn.staticfile.net/twitter-bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"> <script src="//cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script> <script src="//cdn.staticfile.net/popper.js/1.12.5/umd/popper.min.js"></script> <script src="//cdn.staticfile.net/twitter-bootstrap/4.0.0/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>下拉菜单</h2> <p>.active 类会让下拉菜单的选项高亮显示 (添加蓝色背景)。</p> <p>如果要禁用下拉菜单的选项，可以使用.disabled 类。</p> <div class="dropdown"> <button class="btn btn-primary dropdown-toggle" data-toggle="dropdown" type="button"> Dropdown button </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Normal</a> <a class="dropdown-item active" href="#">Active</a> <a class="dropdown-item disabled" href="#">Disabled</a> </div> </div> </div> </body> </html>
运行结果