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function insertionSort(arr) {

    for (var i = 1; i < arr.length; i++) {

        var element = arr[i];

        for (var j = i - 1; j >= 0; j--) {

            var tmp = arr[j];

            var order = tmp - element;

            if (order > 0) {
                arr[j + 1] = tmp;
            } else {
                break;
            }
        }
        arr[j + 1] = element;
    }

    return arr;
}

var arr = [6, 5, 4, 3, 2, 1];
console.log(insertionSort(arr));