<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8"> 
        <title>Bootstrap 实例 - 按钮标签</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>

        <a class="btn btn-default" href="#" role="button">链接</a>
        <button class="btn btn-default" type="submit">按钮</button>
        <input class="btn btn-default" type="button" value="输入">
        <input class="btn btn-default" type="submit" value="提交">

    </body>
</html>