JavaScript DHTML/Object Oriented/prototype

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Add description property to Number objects

  
<html>
<head>
  
  <script type="text/javascript">
     
    Number.prototype.description = null;
    slHighway = new Number(65);
    slHighway.description = "Interstate Highway Speed Limit";
    function tellDifference(num1) {
      document.write(num1.description);
    }
  </script>
</head>
<body>
  <script type="text/javascript">
    tellDifference(slHighway);
  </script>
</body>
</html>
Источник — «http://wbex.ru/index.php?title=JavaScript_DHTML/Object_Oriented/prototype&oldid=3536»