Bootstrap3 徽章收件箱—

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Bootstrap3 徽章收件箱 - 迹忆客(jiyik.com)</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>
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<div class="container">
  <h2>徽章</h2>
  <p>.badge 类指定未读消息的数量:</p>
  <p><a href="#">收件箱 <span class="badge">21</span></a></p>
</div>
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</body>
</html>