h5标签兼容

<!--[if lt IE 9]>

　　<script src="//cdn.bootcss.com/respond.js/1.4.2/respond.js"></script>

 　　<script src="http://cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>

<![endif]—>


http://www.bootcdn.cn/