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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>表单控件: select</h2> <p>以下表单包含了两个下拉菜单 (select 列表):</p> <form> <div class="form-group"> <label for="sel1">单选下拉菜单:</label> <select class="form-control" id="sel1"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select> <br> <label for="sel2">多选下拉菜单(按住 shift 键，可以选取多个选项):</label> <select class="form-control" id="sel2" multiple> <option>1</option> <option>2</option> <option>3</option> <option>4</option> <option>5</option> </select> </div> </form> </div> </body> </html>
运行结果