<!doctype html>
<html >
<head>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
</head>
<body>
<div class="container">
<br/>
<div class="input-group">
<input type="text" class="form-control"/>
<span class="input-group-addon">@qq.com</span>
</div>
</div>
</body>
</html>
原文：http://www.cnblogs.com/qiyc/p/6021156.html