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)

Answer 2

var json = new Object();
var count = new Object();
for(var i in arr1){
    var obj = arr1[i]
    for(var x in obj){
        if (typeof json[x] == 'undefined'){
            count[x] = 1;
            json[x] = parseInt(obj[x]);
        }else{
            count[x] += 1;
            json[x] += parseInt(obj[x]);
        }
    }
}
for(var c in count){
    json[c] = (json[c] / count[c]).toFixed(1);
}
JSON.stringify(json)