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源代码：
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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css"> </head> <body> <div class="container"> <h2>Collapse-down Glyph</h2> <p>Collapse-down icon: <span class="glyphicon glyphicon-collapse-down"></span></p> <p>Collapse-down icon as a link: <a href="#"> <span class="glyphicon glyphicon-collapse-down"></span> </a> </p> <p>Collapse-down icon on a button: <button type="button" class="btn btn-default btn-sm"> <span class="glyphicon glyphicon-collapse-down"></span> Collapse-down </button> </p> <p>Collapse-down icon on a styled link button: <a href="#" class="btn btn-info btn-lg"> <span class="glyphicon glyphicon-collapse-down"></span> Collapse-down </a> </p> </div> <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> </body> </html>
运行结果
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