FizzBuzz Challenge using JS

simpleFizzBuzz.js

function fizz_buzz(start, last)
{
    var i;

    for (i = start; i <= last; i++) {
        var isFizz = i % 3 == 0;
        var isBuzz = i % 5 == 0;
        var string = '';

        if (isFizz)
            string += "Fizz";
        if (isBuzz)
            string += "Buzz";
        if (! isFizz && ! isBuzz)
            string += i;
        
        console.log(string);
    }
}

fizz_buzz(1, 30);