今天小编给大家分享一下vue怎么通过笛卡儿积实现sku库存配置的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。

vue通过笛卡儿积实现sku库存配置

以两个属性为例子，举例说明：

1x1:
白色
S
结合之后就是
[白色,S]

 this.selectCheckArr=[
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 00,
            "attrValueName": "白色"
        }
    ],
    [
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        }
    ]
]
 this.selectCheckArr = this.getProducts(this.selectCheckArr)
 console.log(this.selectCheckArr)
 /** 输出：[
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 00,
            "attrValueName": "白色"
        },
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        }
    ]
]
**/

1x2
白色 黄色
S
结合之后就是
[白色,S ],[黄色,S ]

 this.selectCheckArr=[
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 00,
            "attrValueName": "白色"
        },
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 01,
            "attrValueName": "黄色"
        }
    ],
    [
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        }
    ]
]
 this.selectCheckArr = this.getProducts(this.selectCheckArr)
 console.log(this.selectCheckArr)
 /** 输出： 
 [
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 00,
            "attrValueName": "白色"
        },
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        }
    ],
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 01,
            "attrValueName": "黄色"
        },
       {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        }
    ]
]
**/

2x2
白 黄
S M
结合之后就是
[白色,S ],[白色,M ],[黄色,S ],[黄色,M ]

 this.selectCheckArr= [
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 00,
            "attrValueName": "白色"
        },
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 01,
            "attrValueName": "黄色"
        }
    ],
    [
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        },
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 12,
            "attrValueName": "M"
        }
    ]
]
 this.selectCheckArr = this.getProducts(this.selectCheckArr)
 console.log(this.selectCheckArr)
 /** 输出： 
 [
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 00,
            "attrValueName": "白色"
        },
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        }
    ],
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 00,
            "attrValueName": "白色"
        },
        {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 12,
            "attrValueName": "M"
        }
    ],
    [
         {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 01,
            "attrValueName": "黄色"
        },
         {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 11,
            "attrValueName": "S"
        }
    ],
    [
        {
            "attrId": 0,
            "attrName": "颜色",
            "attrValueId": 01,
            "attrValueName": "黄色"
        },
       {
            "attrId": 1,
            "attrName": "大小",
            "attrValueId": 12,
            "attrValueName": "M"
        }
    ]
]
**/

笛卡儿积方法

    // 笛卡儿积
      getProducts(specs) {
        if (!specs || specs.length == 0) {
          return [];
        } else {
          return joinSpec([
            []
          ], specs, 0, specs.length - 1);
        }

        function joinSpec(prevProducts, specs, i, max) {
          var currentProducts = [],
            currentProduct, currentSpecs = specs[i];
          if (i > max) {
            return prevProducts;
          }
          prevProducts.forEach(function (prevProduct) {
            currentSpecs.forEach(function (spec) {
              currentProduct = prevProduct.slice(0);
              currentProduct.push(spec);
              currentProducts.push(currentProduct);
            });
          });
          return joinSpec(currentProducts, specs, ++i, max);
        }
      },

注意

this.getProducts()的入参，需与博主保持一致(数组对象)，否则会有问题哦~
如果是1x1 ，就是总共生成1条
[ [ { } ] , [ { } ] ]，变成 [ [ { } , { } ] ]
如果是2x1 ，就是总共生成2条
[ [ { } ,{ } ] , [ { } ] ] 变成 [ [ { } ,{ } ] , [ { } ,{ } ] ]

笛卡尔积生成商品SKU组合

    var arr = [
        ['黑色', '白色', '蓝色'],
        ['8GB', '16GB', '32GB'],
        ['大', '中', '小']
    ];
 
    /**
     * 生成笛卡尔积
     * @returns {*}
     */
    function descartes(array) {
        if (array.length < 2) return array[0] || [];
        return [].reduce.call(array, function (col, set) {
            var res = [];
            col.forEach(function (c) {
                set.forEach(function (s) {
                    var t = [].concat(Array.isArray(c) ? c : [c]);
                    t.push(s);
                    res.push(t);
                })
            });
            return res;
        });
    }
    console.log(descartes(arr));

该方法用于根据商品规格属性生成商品SKU组合，以上为javascript代码

执行结果如下：

0: ["黑色", "8GB", "大"]
1: ["黑色", "8GB", "中"]
2: ["黑色", "8GB", "小"]
3: ["黑色", "16GB", "大"]
4: ["黑色", "16GB", "中"]
5: ["黑色", "16GB", "小"]
6: ["黑色", "32GB", "大"]
7: ["黑色", "32GB", "中"]
8: ["黑色", "32GB", "小"]
9: ["白色", "8GB", "大"]
10: ["白色", "8GB", "中"]
11: ["白色", "8GB", "小"]
12: ["白色", "16GB", "大"]
13: ["白色", "16GB", "中"]
14: ["白色", "16GB", "小"]
15: ["白色", "32GB", "大"]
16: ["白色", "32GB", "中"]
17: ["白色", "32GB", "小"]
18: ["蓝色", "8GB", "大"]
19: ["蓝色", "8GB", "中"]
20: ["蓝色", "8GB", "小"]
21: ["蓝色", "16GB", "大"]
22: ["蓝色", "16GB", "中"]
23: ["蓝色", "16GB", "小"]
24: ["蓝色", "32GB", "大"]
25: ["蓝色", "32GB", "中"]
26: ["蓝色", "32GB", "小"]