<!DOCTYPE html>
<html>
<body>
<p>The toString() method can output numbers as base 16 (hex), base 8 (octal), or base 2 (binary).</p>
<p id="demo"></p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var myNumber = 128;
document.getElementById("demo").innerHTML = "128 = " +
myNumber + " Decimal, " +
myNumber.toString(16) + " Hexadecimal, " +
myNumber.toString(8) + " Octal, " +
myNumber.toString(2) + " Binary."
}
</script>
</body>
</html>