BootWiki教程网
源代码：
点击运行
<!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>按钮中的下拉菜单</h2> <div class="btn-group"> <button class="btn btn-primary" type="button">Primary</button> <button class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" type="button"> <span class="caret"></span> </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Link 1</a> <a class="dropdown-item" href="#">Link 2</a> </div> </div> <div class="btn-group"> <button class="btn btn-secondary" type="button">Secondary</button> <button class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" type="button"> <span class="caret"></span> </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Link 1</a> <a class="dropdown-item" href="#">Link 2</a> </div> </div> <div class="btn-group"> <button class="btn btn-success" type="button">Success</button> <button class="btn btn-success dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" type="button"> <span class="caret"></span> </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Link 1</a> <a class="dropdown-item" href="#">Link 2</a> </div> </div> <div class="btn-group"> <button class="btn btn-info" type="button">Info</button> <button class="btn btn-info dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" type="button"> <span class="caret"></span> </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Link 1</a> <a class="dropdown-item" href="#">Link 2</a> </div> </div> <div class="btn-group"> <button class="btn btn-warning" type="button">Warning</button> <button class="btn btn-warning dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" type="button"> <span class="caret"></span> </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Link 1</a> <a class="dropdown-item" href="#">Link 2</a> </div> </div> <div class="btn-group"> <button class="btn btn-danger" type="button">Danger</button> <button class="btn btn-danger dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" type="button"> <span class="caret"></span> </button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Link 1</a> <a class="dropdown-item" href="#">Link 2</a> </div> </div> </div> </body> </html>
运行结果