<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8"> 
        <title>Bootstrap 实例 - 按钮</title>
        <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
        <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
        <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
    </head>
    <body>

        <div class="container">
            <h2>内嵌按钮组</h2>
            <p>内嵌按钮组创建下拉菜单:</p>
            <div class="btn-group">
                <button type="button" class="btn btn-primary">Apple</button>
                <button type="button" class="btn btn-primary">Samsung</button>
                <div class="btn-group">
                    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
                        Sony <span class="caret"></span></button>
                    <ul class="dropdown-menu" role="menu">
                        <li><a href="#">Tablet</a></li>
                        <li><a href="#">Smartphone</a></li>
                    </ul>
                </div>
            </div>
        </div>

    </body>
</html>