代码编辑器：
x
1
2
<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>4
<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script> 5
6
<p>结果: </p>7
<script>8
$(function () { 9
var $p = jQuery( "p" ), p = $p[ 0 ];10
$p.append( jQuery.hasData( p ) + " " ); // false11
$.data( p, "testing", 123 );12
$p.append( jQuery.hasData( p ) + " " ); // true13
$.removeData( p, "testing" );14
$p.append( jQuery.hasData( p ) + " " ); // false15
$p.on( "click", function() {} );16
$p.append( jQuery.hasData( p ) + " " ); // true17
$p.off( "click" );18
$p.append( jQuery.hasData( p ) + " " ); // false