<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="https://www.jb51.net/" />
<title>脚本之家</title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#btn").click(function(){
$(":password").css("background-color","red");
})
})
</script>
</head>
<body>
<ul>
<li>密码框:<input type="password" name="mima" /></li>
</ul>
<button id="btn">点击查看效果</button>
</body>
</html>
