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Welcome to JS Bin
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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="hello">Hello World</p>
</body>
</html>
var ranNum;
$("#hello")
  .mouseenter(function(){
   ranNum = Math.round(Math.random()*10);
    $(this).text(ranNum);
  })
  .mouseleave(function(){
   $(this).text(ranNum+1); 
  });
$(function(){
var timer = setInterval(function() {
  ranNum = Math.round(Math.random()*10);
  $("#hello").text(ranNum);
}, 500);
});
Output

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anonymouspro
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