題目：JavaScript實(shí)現(xiàn)笛卡爾乘積，一般用于商品sku屬性配置，例如輸入['1','2'],['a','b'],['+','-','x']，輸出['1a+','2a+','1b+','2b+','1a-','2a-','1b-','2b-','1ax','2ax','1bx','2bx']

解決方案：case1

case2若：考察的是dfs全排列，而不是復(fù)雜reduce/map