factorial of a number

Question

I have the following code but it is not giving perfect result for factorial can u find it out plz

Answer 1

    function factorial(num) {

    var result = 1;

    for (var i = 1; i <= num; i++) {
        result = result * i;

    }

    return result;
}
//call function e.g factorial(4).. 1*2*3*4 it will evaluate in ascending order