案例：Bootstrap案例     状态：可编辑再运行    进入横版
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   <button type="button" class="btn btn-primary btn-lg btn-block">块级的原始按钮</button>
 
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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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    <title>Bootstrap 实例 - 按钮大小</title>
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    <link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">
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    <script src="/js/bootstrap/jquery.min.js"></script>
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    <script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
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</head>
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<body>
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​
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<p>
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   <button type="button" class="btn btn-primary btn-lg">大的原始按钮</button>
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   <button type="button" class="btn btn-default btn-lg">大的按钮</button>
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</p>
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<p>
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   <button type="button" class="btn btn-primary"> 默认大小的原始按钮</button>
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   <button type="button" class="btn btn-default"> 默认大小的按钮</button>
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</p>
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<p>
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   <button type="button" class="btn btn-primary btn-sm">小的原始按钮</button>
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   <button type="button" class="btn btn-default btn-sm">小的按钮</button>
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</p>
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<p>

 运行结果　
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