<html><head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css"> <script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script> <script src="https://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Badge</h2> <p>The .badge class indicates new or unread items (will automatically collapse when there are no new or unread items, via CSS's :empty selector):</p> <p><a href="#">Inbox <span class="badge">17</span></a></p> </div></body></html>