<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Bootstrap 辅助类</title>
<link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div class="container" style="padding: 40px;">
<div class="row visible-on">
<div class="col-xs-6 col-sm-3" style="background-color: #dedef8;
box-shadow: inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
<span class="hidden-xs">特别小型</span>
<span class="visible-xs"> 在特别小型设备上可见</span>
</div>
<div class="col-xs-6 col-sm-3" style="background-color: #dedef8;
box-shadow: inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
<span class="hidden-sm">小型</span>
<span class="visible-sm"> 在小型设备上可见</span>
</div>
<div class="clearfix visible-xs"></div>
<div class="col-xs-6 col-sm-3" style="background-color: #dedef8;
box-shadow: inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
<span class="hidden-md">中型</span>
<span class="visible-md"> 在中型设备上可见</span>
</div>
<div class="col-xs-6 col-sm-3" style="background-color: #dedef8;
box-shadow: inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
<span class="hidden-lg">大型</span>
<span class="visible-lg"> 在大型设备上可见</span>
</div>
</div>
</div>
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</body>
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