js实现商品SKU算法（笛卡尔乘积）

笛卡尔乘积指数学中，X和Y两个集合的笛卡尔积。表示为X × Y，第一个对象是X的成员，第二个对象是Y的所有可能有序对的其中一个成员 。

假设X=[A,B,C],Y=[1,2,3]那么X与Y的笛卡尔积为[A1,A2,A3,B1,B2,B3,C1,C2,C3]。

使用Javascript实现Sku算法的方式为：

//假设一个商品有两种规格，[3个颜色]，[3个尺码]。3*3=9个SKU
let spec = [
  ["红","绿","蓝"],
  ["大","中","小"]
]

let sku = spec.reduce((x,y) =>{
    let arr = [];
    x.forEach(x => y.forEach(y => arr.push(x.concat([y]))))
    return arr;
},[[]])

console.log(sku)
//输出
/**
[
  ["红","大"],
  ["红","中"],
  ["红","小"],

  ["绿","大"],
  ["绿","中"],
  ["绿","小"],

  ["蓝","大"],
  ["蓝","中"],
  ["蓝","小"]]
*/

例：2 * 3 * 4 * 5 = 120个SKU

let spec = [
  [
    {attr:"颜色",value:"红色"},
    {attr:"颜色",value:"绿色"}
  ],
  [
    {attr:"尺码",value:"S"},
    {attr:"尺码",value:"M"},
    {attr:"尺码",value:"L"}
  ],[
    {attr:"重量",value:"100"},
    {attr:"重量",value:"200"},
    {attr:"重量",value:"300"},
    {attr:"重量",value:"400"}
  ],
  [
    {attr:"年份",value:"2022"},
    {attr:"年份",value:"2021"},
    {attr:"年份",value:"2020"},
    {attr:"年份",value:"2019"},
    {attr:"年份",value:"2018"}
  ],
]
//120个SKU

更多方法欢迎交流～