给二维数组动态赋值

　　　　　　　　let arr = []
            for (let i = 0; i < menuList.length; i++) {
                var arr2 = []
                for (let j = 0; j < menuList[i].chileMenuList.length; j++) {
                    arr2[j] = menuList[i].chileMenuList[j].permission
                }
                arr[i] = arr2
            }