两个数组json 各项相加成新数组

1.简单数组
let sourceData = [
        [1, 2,3,5,56,77,8,89],
        [1, 2,3,5,56,77,8,89],
        [1, 2,3,5,56,77,8,89],
    ]
    function getTotalByArray (sourceData) {
        let col = sourceData[0].length
        let row = sourceData.length
        console.log(col)
        console.log(row)
        let result = []
        
        for(var i = 0; i < col; i++){
            var temp = []
            for (var j = 0; j < row; j++) {
                temp.push(sourceData[j][i])
            }
            console.log(temp); // 代码块一
            let tatal = temp.reduce((total, item) => {
                return total+item
            }, 0)
            result.push(tatal)
        }
        console.log(result); // 代码块二
    }
 代码块一结果
[ 1, 1, 1 ]
[ 2, 2, 2 ]
[ 3, 3, 3 ]
[ 5, 5, 5 ]
[ 56, 56, 56 ]
[ 77, 77, 77 ]
[ 8, 8, 8 ]
[ 89, 89, 89 ]

result结果为
[
    3,   6,  9,  15,  168, 231, 24, 267
]

2.复杂json的运算
getTotalByArray (sourceData) {
      const col = sourceData[0].childArrayList.length
      const row = sourceData.length
      const result = []
      for (var i = 0; i < col; i++) {
        var temp = []
        for (var j = 0; j < row; j++) {
          temp.push(sourceData[j].childArrayList[i])
        }
        //  console.log(temp); // 代码块一
        const tatalorder = temp.reduce((total, item) => {
          return total + item.itemTimeCountVal.orderQuantity
        }, 0)
        const tatalreg = temp.reduce((total, item) => {
          return total + item.itemTimeCountVal.regQuantity
        }, 0)
        result.push({
          monthOrDayVal: i,
          itemTimeCountVal: {
            orderQuantity: tatalorder,
            regQuantity: tatalreg

          }

        })
      }
      return result
    }