​x
 
<!DOCTYPE html>
<html>
<head>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("p").removeAttr("style");
  });
});
</script>
</head>
<body>
​
<h1>This is a heading</h1>
​
<p style="font-size:120%;color:red">This is a paragraph.</p>
<p style="font-weight:bold;color:blue">This is another paragraph.</p>
​
<button>Remove the style attribute from all p elements</button>
​
</body>
</html>