js 操作數組封裝

function OperateArray(array) {
                this.array = array;
            }
            OperateArray.prototype.hasValue = function(val) {
                for (var i = 0; i < this.array.length; i++) {
                    if (this.array[i] == val) {
                        return i;
                    }
                }
                return -1;
            }
            OperateArray.prototype.removeValue = function(val) {
                var index = this.array.indexOf(val);
                if (index > -1) {
                    this.array.splice(index, 1);
                    return this.array;
                }
            }
            var arr = [1, 2, 3, 4, 5];
            var arrcz = new OperateArray(arr);
            arrcz.hasValue(4);//判斷是否有數組 大於0：含有  返回數組的下標
            if (arrcz.hasValue(4) > 0) {
                var resultArr=arrcz.removeValue(4);//刪除數組
                console.log(resultArr)
            }