不定数量的笛卡尔乘积

入参为不定数量的数组的数组

const data = [
  ['aa','bb','cc'],
  ['11','22'],
  ['AA','BB','CC','DD'],
  ... //个数不定
]

返回数据如下

["aa11AA", "aa11BB", "aa11CC", "aa11DD", "aa22AA", ..., "cc22DD"]

function cp(arr) {
    return arr.reduce(function (a,b) {
        let newArr=[]
        a.map(v0 => {
            b.map(v1 => {
                newArr.push('' + v0 + v1);
            })
        })
        return newArr
    })
}