Use Math.abs() inside a JavaScript function to get the difference between two numbers in JavaScript.
Example
You can try to run the following code to get the difference of numbers
Live Demo
<html>
<head>
<script>
var num1, num2;
num1 = 50;
num2 = 35;
var difference = function (num1, num2){
return Math.abs(num1 - num2);
}
document.write("Difference = "+difference(num1,num2));
</script>
</head>
<body></body>
</html>