Bootstrap案例 - W3xue在线HTML/CSS/JS运行工具

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Bootstrap 实例 - 嵌套的按钮组</title>
    <link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">  
    <script src="/js/bootstrap/jquery.min.js"></script>
    <script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
</head>
<body>
​
<div class="btn-group">
    <button type="button" class="btn btn-default">按钮 1</button>
    <button type="button" class="btn btn-default">按钮 2</button>
    <div class="btn-group">
        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
            下列
            <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
            <li><a href="#">下拉链接 1</a></li>
            <li><a href="#">下拉链接 2</a></li>
        </ul>
  </div>