如何使用Node JS访问当前函数定义中一个回调函数返回的值？

Question

我正在学习Node.js。当前，我面临如何在当前函数定义中访问回调函数返回的值的问题？

var list = async(req,res,next) => 
{
let dataQuery = {}; 
let responseArray = [];
let dataArray = [];
let global = {}; 
let records;

if(req.query.type_name != '') {
     dataQuery = {
        type_name: req.query.type_name,
        status:1
    }
} else {
    dataQuery =  {
        status:1
    }
}

Banner.find({},
    (err, banners,callback) => {
        if(banners.length > 0) {
            responseArray.length = 0;
            for(let i=0; i<banners.length; i++) {
                getBannerProducts(banner_id, function(err, result) {

                    dataArray[i] = {
                    _id:banners[i]._id,
                    name:banners[i].name,
                    products:records
                };


            });

            responseArray.push(dataArray[i]);
    }

    res.status(200).json(responseArray);
});       
}



var getBannerProducts = function(banner_id, callback) {
   BannerProductModel.aggregate([
    {
        $lookup:{
                from: "products",       
                localField: "product_id",   
                foreignField: "_id", 
                as: "product"         
        }
    },
    {
        '$match': {
            banner_id: mongoose.Types.ObjectId(banner_id)
        }
    } ,
    {
        "$unwind": {
            path: "$product",
            preserveNullAndEmptyArrays: true
        }
    } ,
    {
        '$project':{
                    _id : 1,
                    banner_id : 1,
                    product_id : 1,
                    product: {
                        name : "$product.name",
                        _id : "$product._id",
                    },
        } 
    }
], function(err, records) {
    callback(err, records);
});

}

结果应该是这样

结果：     [     {        _id：“ 787454545dsds”，        名称：“横幅一”，        产品：[          {             _id：“ 745454554sds”，             名称：“产品一”          }，         {            _id：“ 745454554sds33”，             名称：“产品二”         }      ]    }，    {      _id：“ 787454545dsds23”，      名称：“横幅二”，      产品：[]    }     ]