Trying to find factors of a number in JS

Question

I am just starting JS, and understand the concept of finding a factor. However, this snippet of code is what I have so far. I have the str variable that outputs nothing but the

Answer 1

function calculate(num) {
    var str = "0";
    for (var i = 1; i <= num; i++) {
        if (num % i == 0) {
            str += ',' + i;
        }
    }
    alert(str);
}

calculate(232);

http://jsfiddle.net/67qmt/