SOURCE

function getObjKeys(obj) {
  if (obj !== Object(obj)) {
    throw new TypeError('Invalid object');
  }
  var keys = [];
  for (var key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) {
      keys[keys.length] = key;
    }
  }
  return keys;
}

function arrayCombine(targetArr) {
  var resultArr = [];
  for (var n = 0; n <= targetArr.length; n++) {
    var flagArrs = getFlagArrs(targetArr.length, n);
    while (flagArrs.length) {
      var flagArr = flagArrs.shift();
      var combArr = Array(targetArr.length);
      for (var i = 0; i < targetArr.length; i++) {
        if (flagArr[i]) {
          combArr[i] = targetArr[i];
        }
      }
      resultArr.push(combArr);
    }
  }
  return resultArr;
}
// 从m中取n的所有组合
function getFlagArrs(m, n) {
  var flagArrs = [],
    flagArr = [],
    isEnd = false;
  for (var i = 0; i < m; i++) {
    flagArr[i] = i < n ? 1 : 0;
  }
  flagArrs.push(flagArr.concat());
  // 当n不等于0并且m大于n的时候进入
  if (n && m > n) {
    while (!isEnd) {
      var leftCnt = 0;
      for (var i = 0; i < m - 1; i++) {
        if (flagArr[i] == 1 && flagArr[i + 1] == 0) {
          for (var j = 0; j < i; j++) {
            flagArr[j] = j < leftCnt ? 1 : 0;
          }
          flagArr[i] = 0;
          flagArr[i + 1] = 1;
          var aTmp = flagArr.concat();
          flagArrs.push(aTmp);
          if (aTmp.slice(-n).join('').indexOf('0') == -1) {
            isEnd = true;
          }
          break;
        }
        flagArr[i] == 1 && leftCnt++;
      }
    }
  }
  return flagArrs;
}

function initSKU(sku) {
  var resultSKU = [];
  var skuKeys = getObjKeys(sku);
  for (var i in skuKeys) {
    var skuKey = skuKeys[i]; // 获取一条SKU的key
    var skuData = sku[skuKey]; // 获取一条SKU的相关数据
    var skuKeyAttrs = skuKey.split(';'); // 获取SKU的key的属性数组
    var combArr = arrayCombine(skuKeyAttrs);
    for (var j = 0; j < combArr.length; j++) {
      var key = combArr[j].join(';');
      if (resultSKU[key]) {
        resultSKU[key].count += skuData.count;
        resultSKU[key].prices.push(skuData.price);
      } else {
        resultSKU[key] = {
          count: skuData.count,
          prices: [skuData.price]
        };
      }
    }
  }
  return resultSKU;
}

var skuStockList = [{
    "id": 171,
    "productId": 35,
    "skuCode": "202002250035001",
    "price": 200,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"红色\"},{\"key\":\"尺寸\",\"value\":\"38\"},{\"key\":\"风格\",\"value\":\"夏季\"}]"
  },
  {
    "id": 172,
    "productId": 35,
    "skuCode": "202002250035002",
    "price": 240,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"红色\"},{\"key\":\"尺寸\",\"value\":\"38\"},{\"key\":\"风格\",\"value\":\"秋季\"}]"
  },
  {
    "id": 173,
    "productId": 35,
    "skuCode": "202002250035003",
    "price": 200,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"红色\"},{\"key\":\"尺寸\",\"value\":\"39\"},{\"key\":\"风格\",\"value\":\"夏季\"}]"
  },
  {
    "id": 174,
    "productId": 35,
    "skuCode": "202002250035004",
    "price": 200,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"红色\"},{\"key\":\"尺寸\",\"value\":\"39\"},{\"key\":\"风格\",\"value\":\"秋季\"}]"
  },
  {
    "id": 175,
    "productId": 35,
    "skuCode": "202002250035005",
    "price": 200,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"蓝色\"},{\"key\":\"尺寸\",\"value\":\"38\"},{\"key\":\"风格\",\"value\":\"夏季\"}]"
  },
  {
    "id": 176,
    "productId": 35,
    "skuCode": "202002250035006",
    "price": 200,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"蓝色\"},{\"key\":\"尺寸\",\"value\":\"38\"},{\"key\":\"风格\",\"value\":\"秋季\"}]"
  },
  {
    "id": 177,
    "productId": 35,
    "skuCode": "202002250035007",
    "price": 200,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"蓝色\"},{\"key\":\"尺寸\",\"value\":\"39\"},{\"key\":\"风格\",\"value\":\"夏季\"}]"
  },
  {
    "id": 178,
    "productId": 35,
    "skuCode": "202002250035008",
    "price": 200,
    "stock": 100,
    "lowStock": 50,
    "lockStock": 0,
    "spData": "[{\"key\":\"颜色\",\"value\":\"蓝色\"},{\"key\":\"尺寸\",\"value\":\"39\"},{\"key\":\"风格\",\"value\":\"秋季\"}]"
  }
]

/**
*
*
* /**
       * 生成sku
       * key = [
       * {name: '颜色', item: ['红色', '蓝色'],price: 200 },
       * {name: '尺寸', item: ['38', '39'],price: 250 },
       * {name: '风格', item: ['春季', '夏季', '秋季', '冬季'],price: 200 },
       * ]
       * 数据集合
       * sku = {
       * '颜色;16G;电信': {price: 100, stock: 10}
       * }
       */
*/

var skuArr = [];
var skuMap = {};