Javascript 在数组中操作数组中的数据

我试图弄清楚如何在JS中操作数组中的数据

目前我有：

FuelReceipt.aggregate([
                {$match:{date:{$gte: new Date(fuelStart), $lte: new Date(fuelEnd)}}},
                {$group:{_id: '$truckNumber', 
                         comdataPurchase:{$sum: '$comdataPurchase'},
                         defTotal:{$sum: '$defTotal'}}}]).exec(function(err, data){
                    if(err){
                        console.log('Error Fetching Model');
                        console.log(err);
                    }
                    console.log(JSON.stringify(data, null));
                    fuelArray = data;
                    console.log(fuelArray);
                    fuelArray.forEach(function(_id){
                        console.log(fuelArray['comdataPurchase']);
                    });
                });

我似乎不知道如何访问数组中的数据

我想获取输出：

[
  { _id: 567130, comdataPurchase: 525.49, defTotal: 38.79249 },
  { _id: 567132, comdataPurchase: 1050.98, defTotal: 77.58498 }
]

并从comdataPurchase中减去defTotal

提前非常感谢你

哇，我很特别，哈哈

FuelReceipt.aggregate([
                {$match:{date:{$gte: new Date(fuelStart), $lte: new Date(fuelEnd)}}},
                {$group:{_id: '$truckNumber', 
                         comdataPurchase:{$sum: '$comdataPurchase'},
                         defTotal:{$sum: '$defTotal'}}}]).exec(function(err, data){
                    if(err){
                        console.log('Error Fetching Model');
                        console.log(err);
                    }
                    console.log(JSON.stringify(data, null));
                    fuelArray = data;
                    console.log(fuelArray);
                    fuelArray.forEach(function(data){
                        console.log(data.comdataPurchase-data.defTotal);
                    });
                });

解决