js实现超简单sku组合算法

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

let arr = [     [1, 2, 3],     [4, 5, 6],     [7, 8, 9],     [10, 11, 12], ];   function cartesianProductOf() {     return Array.prototype.reduce.call(arguments,       function(a, b) {         var ret = [];         a.forEach(function(a) {             b.forEach(function(b) {                 ret.push(a.concat([b]));             });         });         return ret;     }, [[]]); }   let allArr =cartesianProductOf(...arr ) console.log(allArr)

　　此算法类似笛卡尔积