js对象数组根据某一值排序

      //排序函数
            getSortFun(order, sortBy) {
                var ordAlpah = order == "asc" ? ">" : "<";
                var sortFun = new Function(
                    "a",
                    "b",
                    "return a." + sortBy + ordAlpah + "b." + sortBy + "?1:-1"
                );
                return sortFun;
            },

vm.arr.sort(vm.getSortFun('desc','gift_count'))  gift_count数组某一值  desc降序  asc升序