JQuery Tutorial 38 - key up function with an example

Code:
<!doctype html>
<html lang="en">
<head>
 <title>JQueryexamplecode.blogspot.com</title>
   <script type="text/javascript" src="js/jquery.js"></script>
</head>
<body>
 <input type='text' id='txtName' />
 <span id='SampleText'></span>
 <script>
  $('#txtName').keyup(function(){
   var textValue=$('#txtName').val();
   alert(textValue);
  });
 </script>
</body>                                                                                  
</html>

Output:
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