Json数组合并并求出平均值

Question

现在有一个数组是这样的var arr1=[{"语文":60,"数学":30,"音乐":40},{"语文":30,"数学":10},{"英语":60,"数学":60}]现在我要生成一个json内容为:该数组中一样的key值生成出来的value值为一个平均值 不相同的就是原来的数具体为这样var json={"语文":45,"数学":33.3,"音乐":40,"英语":60}

Answer 1

const arr1=[{"语文":60,"数学":30,"音乐":40},{"语文":30,"数学":10},{"英语":60,"数学":60}]

const output = {}

const record = {}

arr1.forEach((object) => {

  for (let v in object) {

    if (!output[v]) {

      record[v] = 1

      output[v] = object[v]

    } else{

      record[v] += 1

      output[v] += object[v]

    }

  }

})

for (let v in record) {

  output[v] = output[v] / record[v]

}

console.log(output)

console.log(record)