javascript - js请教：A数组的某个元素如何更新为B数组的值 ？

Question

盘点前库存表

[
  {'item':'aaa','model':'9×9×9','stock':'成品仓','qty':100},
  {'item':'bbb','model':'5×5×5','stock':'成品仓','qty':200},
  {'item':'ccc','model':'8×8×8','stock':'成品仓','qty':400}
]

盘点表（含有些空白废数据)

[
  {'item':'aaa','qty':888},
  {'item':'ccc','qty':999},
  {'item':'','qty':},
  {'item':'','qty':},
  {'item':'','qty':}
]

希望得到：正确库存表

[
  {'item':'aaa','model':'9×9×9','stock':'成品仓','qty':888},
  {'item':'ccc','model':'8×8×8','stock':'成品仓','qty':999}
]

Answer 1

const preStock = [
  {'item': 'aaa', 'model': '9×9×9', 'stock': '成品仓', 'qty': 100},
  {'item': 'bbb', 'model': '5×5×5', 'stock': '成品仓', 'qty': 200},
  {'item': 'ccc', 'model': '8×8×8', 'stock': '成品仓', 'qty': 400}
];

const checkStock = [
  {'item':'aaa','qty':888},
  {'item':'ccc','qty':999},
  {'item':'','qty':''},
  {'item':'','qty':''},
  {'item':'','qty':''}
];

const preStockObj = {};
preStock.forEach(item => preStockObj[item.item] = item);

checkStock.forEach(item => {
  if (item.item && preStockObj.hasOwnProperty(item.item)) {
    const targetItem = preStockObj[item.item];
    targetItem.qty = item.qty;
  }
});

const result = [];
for (let key in preStockObj) {
  const item = preStockObj[key];
  if (item.qty) {
    result.push(item);
  }
}

console.log(result);

Answer 2

function mergeArrays(arr1, arr2) {
    let result = [];
    for (let i = 0; i < arr1.length; i++) {
        for (let j = 0; j < arr2.length; j++) {
            if (arr1[i].item === arr2[j].item && arr2[j].item !== '') {
                result.push(Object.assign({}, arr1[i], arr2[j]));
            }
        }
    }
    return result;
}

let newArray = mergeArrays(arr1, arr2);
console.log(newArray);