Bootstrap 引入文件顺序及IE兼容性js
<!DOCTYPE html>
<html >
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<link rel="stylesheet" href="css/bootstrap.css">
<!--[if lt IE 9]>
<script src=“http://css3-mediaqueries-js.googlecode.com/svn/trunk/css3-mediaqueries.js”></script> //可选
</body>
</html>