在IE浏览器中运行最新渲染模式
<meta http-equiv="X-UA-Compatible" content="IE=edge">初始化移动端设备浏览显示
<meta name="viewport" content="width=device-width,initial-scale=1"> 使IE8支持Html5元素与媒体查询
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
[if lt IE 9]
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
[endif]1：CSS文件应放在<head>标签中，JS文件放在<body>标签的最后
2：Jquery.js必须在bootstrap之前引用
3：row必须包含在container中