案例：Bootstrap案例     状态：可编辑再运行    进入竖版
 运行结果　
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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 - 响应式的列重置</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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<div class="container">
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   <div class="row" >
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      <div class="col-xs-6 col-sm-3"
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         style="background-color: #dedef8;
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         box-shadow: inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
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         <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
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      </div>
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      <div class="col-xs-6 col-sm-3"
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         style="background-color: #dedef8;box-shadow:
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         inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
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         <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
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            eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut
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            enim ad minim veniam, quis nostrud exercitation ullamco laboris
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            nisi ut aliquip ex ea commodo consequat.
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         </p>
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         <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
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            eiusmod tempor incididunt ut.
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         </p>
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      </div>
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​
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      <div class="clearfix visible-xs"></div>
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​
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      <div class="col-xs-6 col-sm-3"
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         style="background-color: #dedef8;
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         box-shadow:inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
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         <p>Ut enim ad minim veniam, quis nostrud exercitation ullamco
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            laboris nisi ut aliquip ex ea commodo consequat.
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         </p>
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      </div>
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      <div class="col-xs-6 col-sm-3"
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         style="background-color: #dedef8;box-shadow:
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         inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
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         <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
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            eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut
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            enim ad minim
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         </p>
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      </div>