源代码:
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css"> </head> <body> <div class="container"> <h2>实例</h2> <p> .caret 类显示了一个下拉的功能: <span class="caret"></span></p> <p> .caret 类在按钮中使用：</p> <div class="btn-group"> <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">Menu <span class="caret"></span></button> <ul class="dropdown-menu" role="menu"> <li><a href="#">一个链接</a></li> <li><a href="#">另一个链接 link</a></li> <li><a href="#">其他功能</a></li> </ul> </div> </div> <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script> <script src="http://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script> </body> </html>
运行结果：