<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("p").removeAttr("id class");
});
});
</script>
<style type="text/css">
#p1
{
color:white;
background-color:green;
font-size:20px;
padding:5px;
}
.blue
{
color:white;
background-color:blue;
font-size:20px;
padding:5px;
}
</style>
</head>
<body>
<h1>This is a heading</h1>
<p id="p1">This is a paragraph.</p>
<p class="blue">This is another paragraph.</p>
<button>Remove id and class attribute from all p elements</button>
</body>
</html>