<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<link rel="stylesheet" href='http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css'
<title>Hello World</title>
</head>
<body>
<div><h1>Hello World!</h1><br><input input='button' class='btn btn-primary' value='我是按钮,按我一下'>
</div>
</body>
</html>
