javascript實現正整數分數約分

//m,n為正整數的分子和分母
function reductionTo(m, n) {
    var arr = [];
    if (!isInteger(m) || !isInteger(n)) {
        console.log('m和n必須為整數');
        return;
    } else if (m<=0||n <= 0) {
        console.log('m和n必須大於0');
        return;
    }
    var a = m;
    var b = n;
    (a >= b) ? (a = m, b = n) : (a = n, b = m);
    if (m != 1 && n != 1) {
        for (var i = b; i >= 2; i--) {
            if (m % i == 0 && n % i == 0) {
                m = m / i;
                n = n / i;
            }
        }
    }
    arr[0] = m;
    arr[1] = n;
    return arr;
}

//判斷一個數是否為整數
function isInteger(obj) {
    return obj % 1 === 0
}