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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <p id="hello1">Hello World</p>
  <p id="hello2">Hello World</p>
  <p id="hello3">Hello World</p>
  <p id="hello4">Hello World</p>
</body>
</html>
 
                                        
$(function(){
  $("#hello2").click(function(){alert("click1");});
  $("#hello2").click(function(){alert("click2");});
  $("#hello1").click(function(){alert("click1");});
  $("#hello3").click(function(){alert("click1");});
  $("#hello4").click(function(){alert("click1");});
                    
 
 
 $.fn.hasMultipleEventHandlersFor = function(event) {
    return this.filter(function() {
        var events =  $(this).data('events');
        return events && events[event] && events[event].length > 1;
    });
};
 
 
 $('*').hasMultipleEventHandlersFor('click').css('color', 'red');
 
 });  
​
Output 300px

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