​x
 
<!DOCTYPE html>
<html>
<head>
  <script type="text/javascript" src="/jquery/jquery.js"></script>
</head>
​
<body>
​
<p>结果：</p>
​
<script>
$(function(){
  var $p = jQuery("p"), p = $p[0];
  $p.append(jQuery.hasData(p)+" "); /* false */
  jQuery.data(p, "testing", 123);
  $p.append(jQuery.hasData(p)+" "); /* true*/
  jQuery.removeData(p, "testing");
  $p.append(jQuery.hasData(p)+" "); /* false */
});
</script>
​
</body>
</html>
​