<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="//www.VeVB.COm/" />
<title>focus事件-武林网</title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("input").focus(function(){
$(this).css("backgroundColor","red")
})
})
</script>
</head>
<body>
<div>
<ul>
<li>用户名:<input type="text" name="username" /></li>
<li>密码:<input type="password" name="userpassword" /></li>
</ul>
</div>
</body>
</html>
