案例：Bootstrap案例     状态：可编辑再运行    进入横版
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<!DOCTYPE html>
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<html>
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  <head>
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    <meta charset="utf-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1">
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    <link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">
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  </head>
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​
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  <body>
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    <div class="container">
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      <h2>Envelope Glyph</h2>
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      <p>Envelope icon: <span class="glyphicon glyphicon-envelope"></span></p>
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      <p>Envelope icon as a link:
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        <a href="#">
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          <span class="glyphicon glyphicon-envelope"></span>
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        </a>
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      </p>
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      <p>Envelope icon on a button:
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        <button type="button" class="btn btn-default btn-sm">
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          <span class="glyphicon glyphicon-envelope"></span> Envelope
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        </button>
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      </p>
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      <p>Envelope icon on a styled link button:
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        <a href="#" class="btn btn-info btn-lg">

 运行结果　
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