Modulus

The modulus (remainder) operator is %.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
        var result = 26 % 5; //equal to 1 
        document.writeln(result); //1
    </script>
</head>
<body>
</body>
</html>

Click to view the demo

If either of the operands isn't a number, it is converted to a number using the Number() casting function. An empty string is treated as 0, and the Boolean value of true is treated as 1.

The modulus operator has the following behaviors:

dividend	divided by	RESULT
number	number	regular arithmetic division
infinite number	finite number	NaN
finite number	0	NaN
Infinity	Infinity	NaN
finite number	infinite number	return dividend
0	nonzero	zero