MongoDB找出子集数据并输出结果

MongoDB数据库格式：

{
"SerialNo": "NJW8888888",
"ManifestServiceCode": "USPS",
"CreateManifestDatas": [{
"TrackingNumber": "7488888109972671",
"PackageSn": "NTX180518ARTN000010",
"ClientNo": "ABC"
},
{
"TrackingNumber": "7488888109972672",
"PackageSn": "NTX180518ARTN000027",
"ClientNo": "BCD"
},
{
"TrackingNumber": "7488888109972673",
"PackageSn": "NTX180518ARTN000027",
"ClientNo": "BCD"
}
]
}

找出ClientNo为BCD的PackageSn：

var dataResult = [];
var clientNos = ['BCD'];
var result = db.getCollection('Manifest').find({"SerialNo" : "NJW8888888"});

var datas = result[0].CreateManifestDatas;

datas.forEach(function(item){
clientNos.forEach(function(clientNo){
if(clientNo==item.ClientNo){
dataResult.push(item.PackageSn);
}
});
});

print(dataResult);