<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="https://www.jb51.net/" />
<title>脚本之家</title>
<style type="text/css">
div{
height:200px;
width:200px;
border:1px solid blue
}
.reset{
font-size:20px;
color:green;
}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#btn").click(function(){
$("div").removeAttr("class");
})
})
</script>
</head>
<body>
<div class="reset">脚本之家欢迎您</div>
<button id="btn">点击查看效果</button>
</body>
</html>