var findCommonElements= function(arrs) {
    var resArr = [];
    for (var i = arrs[0].length - 1; i > 0; i--) {


        for (var j = arrs.length - 1; j > 0; j--) {
            if (arrs[j].indexOf(arrs[0][i]) == -1) {
                break;
            }
        }

        if (j === 0) {
            resArr.push(arrs[0][i]);
        }


    }
    return resArr;
}

var arrays  = [
    [1, 4, 6, 78, 8, 9, 124, 44],
    [44, 6, 9],
    [124, 44, 16, 9]
]

findCommonElements( arrays )
[44, 9]

var findCommonElements= function(arrs) {
    var nArrs = arrs.length;
    var aLen = arrs.map(function(arr) { return arr.length; });
    var minLen = Math.min.apply(null, aLen);
    for (var k = 0; k < nArrs && aLen[k] > minLen; k++) ;
    var sample = arrs[k];
    var resArr = [];
    for (var n = sample.length, i = 0; i < n; i++) {
        if (i == k) continue;
        var val = sample[i]; // the current element
        for (var j = 0; j < nArrs && j == k || arrs[j].indexOf(val) >= 0; j++) ;
        if (j == nArrs) resArr.push(val);
    }
}