前端处理返回数据为数组对象且对象嵌套数组并重名的数据，合并名称并叠加数据

var newList=[];
var table={};
var dataObj={};
var finalList=[];
var tableData=[
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'20',tacheName:'奔驰'}]},
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'30',tacheName:'宝马'}]},
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'40',tacheName:'宝马'}]},
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'50',tacheName:'帕萨特'}]},
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'60',tacheName:'法拉利'}]},
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'70',tacheName:'帕萨特'}]},
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'80',tacheName:'法拉利'}]},
    {brName:'营业部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'90',tacheName:'奔驰'}]},
    {brName:'销售部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'10',tacheName:'奔驰'}]},
    {brName:'销售部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'50',tacheName:'奔驰'}]},
    {brName:'销售部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'70',tacheName:'帕萨特'}]},
    {brName:'销售部',dateStr:'2023-11-23',tacheArr:[{dealCnt:'20',tacheName:'帕萨特'}]},
];
for(let i in tableData){
    brName=tableData[i].brName;
    dateStr=tableData[i].dateStr;
    tacheArr=tableData[i].tacheArr;
    if(table[brName]==null){
         if(tacheArr[0].tacheName=='奔驰'){
               table[brName]={'name':brName,'dateStr':dateStr,'val1':Number(tacheArr[0].dealCnt),'val2':0,'val3':0,'val4':0,'val5':0,}
         }else if(tacheArr[0].tacheName=='宝马'){
               table[brName]={'name':brName,'dateStr':dateStr,'val1':0,'val2':Number(tacheArr[0].dealCnt),'val3':0,'val4':0,'val5':0,}
         }else if(tacheArr[0].tacheName=='法拉利'){
               table[brName]={'name':brName,'dateStr':dateStr,'val1':0,'val2':0,'val3':Number(tacheArr[0].dealCnt),'val4':0,'val5':0,}
         }else if(tacheArr[0].tacheName=='布加迪'){
               table[brName]={'name':brName,'dateStr':dateStr,'val1':0,'val2':0,'val3':0,'val4':Number(tacheArr[0].dealCnt),'val5':0,}
         }else if(tacheArr[0].tacheName=='帕萨特'){
               table[brName]={'name':brName,'dateStr':dateStr,'val1':0,'val2':0,'val3':0,'val4':0,'val5':Number(tacheArr[0].dealCnt),}
         }
    }else{
         if(tacheArr[0].tacheName=='奔驰'){
               table[brName].val1+=Number(tacheArr[0].dealCnt)
         }else if(tacheArr[0].tacheName=='宝马'){
               table[brName].val2+=Number(tacheArr[0].dealCnt)
         }else if(tacheArr[0].tacheName=='法拉利'){
               table[brName].val3+=Number(tacheArr[0].dealCnt)
         }else if(tacheArr[0].tacheName=='布加迪'){
               table[brName].val4+=Number(tacheArr[0].dealCnt)
         }else if(tacheArr[0].tacheName=='帕萨特'){
               table[brName].val5+=Number(tacheArr[0].dealCnt)
         }
    }
}
for(key in table){
    newList.push(table[key])
}
for(let k=0;k<newList.length;k++){
    dataObj={'brName':newList[k].name,'dateStr':newList[k].dateStr,'val1':newList[k].val1,'val2':newList[k].val2,'val3':newList[k].val3,'val4':newList[k].val4,'val5':newList[k].val5,}
    finalList.push(dataObj)
}
console.log(finalList)

这里可以看到我们输出的结果，我们已经将重名的数据合并并且相同的数据叠加合并