<html>
<body>
<p id="demo">Click the button to call the new myMet() method, and display the number 55 half value, using the new myProp property.</p>
<button onclick="myFunction()">Try it</button>
<script>
Number.prototype.myMet=function()
{
this.myProp=this.valueOf()/2;
}
function myFunction()
{
var d = new Number(55);
d.myMet();
var x=document.getElementById("demo");
x.innerHTML=d.myProp;
}
</script>
</body>
</html>