<title>Bootstrap3 清除浮动 - 迹忆客(jiyik.com)</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="container-fluid">
<div class="col-xs-6 col-sm-3" style="background-color:lavender;">
重置窗口大小，查看效果。也尝试删除有 clearfix 的 div 查看效果。
<div class="col-xs-6 col-sm-3" style="background-color:lavenderblush;">列 2</div>
<div class="clearfix visible-xs"></div>
<div class="col-xs-6 col-sm-3" style="background-color:lightcyan;">列 3</div>
<div class="col-xs-6 col-sm-3" style="background-color:lightgray;">列 4</div>
