Node.js 异步/等待不按顺序执行

如何解决这个问题？我总是有1000英镑的余额。我希望余额是3000

var checked = [{ _id: '5d96a7ba5ccc6a5850ee5ae7'}, {_id: '5d96a7ba5ccc6a5850ee5ae7' }, {_id: '5d96a7ba5ccc6a5850ee5ae7}];
var income = 1000;

checked.forEach(async x => {

    let balance = CustomerBalanceModel.findOne({user_id: x._id}).exec();

    let balanceValue = {
        balance: (balance + income),
        user_id: x._id,
        updated_at: dateFormatter.date(date)
    }
    await CustomerBalanceModel.findOneAndUpdate({user_id: x._id}, balanceValue, { upsert: true, new: true }).exec();
})

---

您忘记在第一次异步操作之前键入

等待

：

let balance = await CustomerBalanceModel.findOne({user_id: x._id}).exec(); 

所以只需在

CustomerBalanceModel.findOne（…）之前添加
wait