Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>Click the button to call myMethod() that display a number's half value.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
Number.prototype.myMethod = function() {
    return this.valueOf() / 2;
};

function myFunction() {
    var n = 55;
    document.getElementById("demo").innerHTML = n.myMethod();
}
</script>

</body>
</html>