The prototype property allows you to add properties or methods to all instances of this class.
<html> <body> <script language="JavaScript"> <!-- var myProp = new Number(); function triple(num){ var result; result = (num * 3); return result; } Number.prototype.calc3 = triple; document.write("Example demonstrates the prototype property for the number object."+ "<br><br>"); document.write("150 tripled is: " + myProp.calc3(150) + "<br>"); --> </script> </body> </html>