<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>code2</title>
<link rel="stylesheet" href="css/bootstrap.min.css"/>
<script type="application/javascript" src="js/jquery-1.12.3.min.js"></script>
<script type="application/javascript" src="js/bootstrap.min.js"></script>
<style>
div{border:1px solid red}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-6 col-sm-3">col-xs-6 col-sm-3 1<br/>胡大臣数胡大臣</div>
<div class="col-xs-6 col-sm-3">col-xs-6 col-sm-3 2</div>
<div class="clearfix visible-xs"></div>
<!--清除了3的浮动使得3排在1的下面-->
<div class="col-xs-6 col-sm-3">col-xs-6 col-sm-3 3</div>
<div class="col-xs-6 col-sm-3">col-xs-6 col-sm-3 4</div>
</div>
</div>
</body>
</html>
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