如何使用代码生成多个数据项的笛卡尔积？

let combine = function(...chunks) {
  let res = []

  let helper = function(chunkindex, prev) {
    let chunk = chunks[chunkindex]
    let islast = chunkindex === chunks.length - 1
    for (let val of chunk) {
      let cur = prev.concat({name: val})
      if (islast) {
        // 如果已经处理到数组的最后一项了 则把拼接的结果放入返回值中
        res.push({spec: cur})
      } else {
        // 如果还没处理到数组的最后一项 则继续递归遍历下一项
        helper(chunkindex + 1, cur)
      }
    }
  }

  // 从属性数组下标为 0 开始处理
  // 并且此时的 prev 是个空数组
  helper(0, [])

  return res
}

let names = ["iphone x", "iphone xs"]
let colors = ["黑色", "白色"]
let storages = ["64g", "256g"]

console.log(combine(names, colors, storages))

[
  { spec: [ { name: 'iPhone X' }, { name: '黑色' }, { name: '64g' } ] },
  { spec: [ { name: 'iPhone X' }, { name: '黑色' }, { name: '256g' } ] },
  { spec: [ { name: 'iPhone X' }, { name: '白色' }, { name: '64g' } ] },
  { spec: [ { name: 'iPhone X' }, { name: '白色' }, { name: '256g' } ] },
  { spec: [ { name: 'iPhone XS' }, { name: '黑色' }, { name: '64g' } ] },
  { spec: [ { name: 'iPhone XS' }, { name: '黑色' }, { name: '256g' } ] },
  { spec: [ { name: 'iPhone XS' }, { name: '白色' }, { name: '64g' } ] },
  { spec: [ { name: 'iPhone XS' }, { name: '白色' }, { name: '256g' } ] }
]