javasript中对象数组赋值问题

Question

RT,首先我从服务器获取的数据是这样的

 var mData = 
[{
    reportTitle:"报表1",
    reportName:"近七周缺货率"
},
{
    reportTitle:"报表1",
    reportName:"近7周商品动销率对比"
},
{
    reportTitle:"报表2",
    reportName:"近7周商品动销率对比"
},
{
    reportTitle:"报表2",
    reportName:"近七周缺货率"
}];

目标（经过处理后）是这样的：

 var results = 
[{
    reportTitle:"英达辉商业调拨店",
    reportArray:
    [{
        reportName:"近七周缺货率"
    },
    {
        reportName:"近7周商品动销率对比"
    }]
},
{
    reportTitle:"英达辉备货通店",
    reportArray:
    [{
        reportName:"近七周缺货率"
    },
    {
        reportName:"近7周商品动销率对比"
    }]
}];

我用的方法是这样的：

 var bizArray = new Array()
var mArray = new Array()
let count = 0,index = 0

for(let i = 0; i < mData.length - 1; i++){

    addData()

    if(mData[i].reportTitle != mData[i+1].reportTitle){
        count++
        index = 0
    }
    else{
        index++
    }

    function addData (){
        bizArray[count] = new Object()
        bizArray[count].dataArray = new Array()
        mArray[index] = new Object()
        mArray[index].reportName = mData[i].reportName
        bizArray[count].dataArray = mArray

        console.log(i,mArray)
        console.log(bizArray[count].dataArray[index].reportName)
    }
}

我觉得我思路应该是对的，但是不知道为什么结果是错的，所以我在处理的过程中进行了打印，结果发现

 console.log(bizArray[count].dataArray[index].reportName)

输出是正确的，但是mArray的输出是错误的，所以我想知道错误的具体原因，或者另一种可行的解决方案，谢谢

Answer 1

看得蛋痛。。帮你录一个还快点

    var mData =
 [{
     reportTitle: "报表1",
     reportName: "近七周缺货率"
 },
 {
     reportTitle: "报表1",
     reportName: "近7周商品动销率对比"
 },
 {
     reportTitle: "报表2",
     reportName: "近7周商品动销率对比"
 },
 {
     reportTitle: "报表2",
     reportName: "近七周缺货率"
 }];
    var kv = {};
    for (var i = 0; i < mData.length ; i++) {
        reportArray = kv[mData[i].reportTitle] || [];
        reportArray.push({ reportName: mData[i].reportName })
        kv[mData[i].reportTitle] = reportArray;
    }
    var newData=[];
    for (attr in kv) newData.push({ reportTitle: attr, reportArray: kv[attr] });
    console.log(newData)