KO中对象数组排序时，两个属性的优先顺序不一致时的排序实现

function FromSort(left, right, asc) {
    if (left.属性1 != "") {
        if (right.属性1 != "") {
            return left.属性1 == right.属性1 ? 0 : (left.属性1.localeCompare(right.属性1) < 0 ? -asc : asc);
        } else {
            return -1;
        }
    } else {
        if (right.属性1 != "") {
            return 1;
        } else {
            return left.属性2 == right.属性2 ? 0 : (left.属性2.localeCompare(right.属性2) < 0 ? -asc : asc);
        }
    }
}