关于前端:数组元素上下移动

        /**         * 上、下挪动         * @param {number} code 下标         * @param {number} dir  1上移  0下移         */        onMove(code, dir) {            let moveComm = (curIndex, nextIndex) => {                let arr = this.commodityInfo                arr[curIndex] = arr.splice(nextIndex, 1, arr[curIndex])[0]                return arr            }            this.commodityInfo.some((val, index) => {                if (index === code) {                    if(val.primarySku) { // 判断是否为主样式                        this.$message.warning('主样式不能够挪动！')                    } else {                        if (dir === 1 && index === 1) {                            this.$message.warning('已在顶部！')                        } else if (dir === 0 && index === this.commodityInfo.length - 1) {                            this.$message.warning('已在底部！')                        } else {                            let nextIndex = dir === 1 ? index - 1 : index + 1                            this.commodityInfo = moveComm(index, nextIndex)                            this.$message.success('已挪动！')                        }                    }                    return true                }                return false            })        },