xxxxxxxxxx<html><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css"> <script src="//apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script> <script src="//apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Button</h2> <p> .btn 类是按钮的基本样式:</p> <button type="button" class="btn">基本按钮</button></div></body></html>