Javascript 无法打印json中的属性

我正在动态地将新属性（对象）添加到现有对象中

这是我的密码：

.then(transactionDetails => {
            console.log(transactionDetails);
            if(transactionDetails != null){
                transactionDetails["nextDueDate"];
                for(var i = 0; i < transactionDetails.length; i++){
                    if(transactionDetails[i].customers_installment_detail.installment1_isPaid === false){
                        nextDueDate = {
                            installment1_dueAmount:transactionDetails[i].customers_installment_detail.installment1_dueAmount,
                            installment1_dueDate:transactionDetails[i].customers_installment_detail.installment1_dueDate
                        }
                    }else if(transactionDetails[i].customers_installment_detail.installment2_isPaid === false){
                        nextDueDate = {
                            installment2_dueAmount:transactionDetails[i].customers_installment_detail.installment2_dueAmount,
                            installment2_dueDate:transactionDetails[i].customers_installment_detail.installment2_dueDate
                        }
                    }else if(transactionDetails[i].customers_installment_detail.installment3_isPaid === false){
                        nextDueDate = {
                            installment3_dueAmount:transactionDetails[i].customers_installment_detail.installment3_dueAmount,
                            installment3_dueDate:transactionDetails[i].customers_installment_detail.installment3_dueDate
                        }
                    }else if(transactionDetails[i].customers_installment_detail.installment4_isPaid === false){
                        nextDueDate = {
                            installment2_dueAmount:transactionDetails[i].customers_installment_detail.installment4_dueAmount,
                            installment2_dueDate:transactionDetails[i].customers_installment_detail.installment4_dueDate
                        }
                    }
                    transactionDetails[i]["nextDueDate"] = nextDueDate;
                }
                res.json({response:transactionDetails});
            }else{
                res.json({response:"No active transaction."});
            }
        })

。然后（transactionDetails=>{
console.log（事务细节）；
if（transactionDetails！=null）{
交易详情[“下一个交易日期”]；
对于（var i=0；i

---

我正在动态添加

nextDueDate

。我可以通过键入

transactionDetails[0]在控制台中打印出值。但是，当我尝试用JSON打印出整个对象时，
nextDueDate
丢失，无法打印出来。有什么原因吗？
这是由于根据此线程对问题进行续集：

我通过在模型中添加虚拟列修复了此问题

nextDueDate: Sequelize.VIRTUAL

上面的控制台语句不在顶部吗？我的意思是，您稍后将添加动态属性。正如@YousafHassan所说，您的console.log for transactionDetails将在添加nextDueDate之前执行。此外，该行交易详情[“nextDueDate”]；没有意义。@YousafHassan我在res.json（{response:transactionDetails}）上放了一个断点@kylas这是因为transactionDetails[“nextDueDate”]；什么都不做。为其指定一些值，例如null，以查看差异。