<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8"> 
        <title>Bootstrap 实例 - 按钮激活状态</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>

        <p>
            <button type="button" class="btn btn-default btn-lg ">默认按钮</button>
            <button type="button" class="btn btn-default btn-lg active">激活按钮</button>
        </p>
        <p>
            <button type="button" class="btn btn-primary btn-lg ">原始按钮</button>
            <button type="button" class="btn btn-primary btn-lg active">激活的原始按钮</button>
        </p>

    </body>
</html>