常用于电商类项目（超浅显层面）
例如一种商品有三种规格：颜色，尺寸，种类
颜色又分为：[红，黄，蓝]
尺寸：[A,B]
种类：[1,2,3]
可以结合为多种排列
如：[‘红’，A,1],[‘黄’，A,1],....等，可以用到sku排列算法：
摘抄的代码，原地址给忘了，
let arr = [
[1, 2, 3],
['红', '黄', '蓝'],
['A', 'B']
];
function cartesianProductOf() {
return Array.prototype.reduce.call(arguments, (fristItem, secondItem) => {
var ret = [];
fristItem.forEach(function(fristItem) {
secondItem.forEach(function(secondItem) {
ret.push(fristItem.concat([secondItem]));
});
});
return ret;
}, [[]]);
}
let allArr =cartesianProductOf(...arr )
console.log(allArr)
返回结果：
1 (18) [Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3), Array(3)] 2 0: (3) [1, "红", "A"] 3 1: (3) [1, "红", "B"] 4 2: (3) [1, "黄", "A"] 5 3: (3) [1, "黄", "B"] 6 4: (3) [1, "蓝", "A"] 7 5: (3) [1, "蓝", "B"] 8 6: (3) [2, "红", "A"] 9 7: (3) [2, "红", "B"] 10 8: (3) [2, "黄", "A"] 11 9: (3) [2, "黄", "B"] 12 10: (3) [2, "蓝", "A"] 13 11: (3) [2, "蓝", "B"] 14 12: (3) [3, "红", "A"] 15 13: (3) [3, "红", "B"] 16 14: (3) [3, "黄", "A"] 17 15: (3) [3, "黄", "B"] 18 16: (3) [3, "蓝", "A"] 19 17: (3) [3, "蓝", "B"] 20 length: 18 21 __proto__: Array(0)
也可以简化一下：
1 <script type="text/javascript"> 2 let arr = [ 3 [1, 2, 3], 4 ['红', '黄', '蓝'], 5 ['A', 'B'] 6 ]; 7 fn = (a, b) => [].concat(...a.map(d => b.map(e => [].concat(d, e)))); 8 specification = (a, b, ...c) => (b ? specification(fn(a, b), ...c) : a) 9 let output = specification(...arr) 10 console.log(output) 11 </script>
结果和上面相同，记下来 慢慢学习规整
