NodeJS POST保持挂起状态

我用jQuery向NodeJS后端发布了一个json字符串,在后端处理post数据时遇到了问题。后端似乎在某处受阻,但我找不到位置。因此,我的POSTS将状态保持为待定状态,有时会返回200。

我下面的代码使用async.forEach retValTravelInsurerList循环,这是一个由23个保险公司组成的数组。我有一个嵌套的async.forEach,它用值设置构造函数,并在filterTravelInsurerOverage中执行查询。这意味着23个查询通过Mongoose(MongoDB)数据库执行。

如果在filterTravelInsurerOverage数组中找到retValTravelInsureerList中的项目,我只需要这些项目,并且我将填充一个新的数组(retValTravelInsurerAndCoverageList),其中存储了所有需要的项目。

如果旅行保险公司承保范围包含retValTravelInsurerList=>假设23。

但是,如果生成的数组(retValTravelInsurerAndCoverageList)长度小于(travelinsurercoverage)长度,则会发生POST问题,如果我向服务器发布几次,则Chrome的javascript控制台中的状态保持为“待定”。

在我看来,NodeJS调用堆栈中仍然有一些项,即使在返回callback()时也会阻止未来的POSTS;被调用。

有人知道如何解决这个问题吗?

顺便说一句:我使用异步库,在返回callback()之后;调用res.send(JSON.stringify(retValTravelInsurerAndCoverageList));被调用。

function(callback) {
  var count = 0;
  async.forEach(retValTravelInsurerList, function(item, callback1) {

    count++;

    travelinsurercoverageMdl.constructorTravelInsurerCoverage('', item._id, item.familytype,'','',this.wintersport,'',this.adventuresport, this.accidents,'','','','',this.motoristaid,'','','');
    travelinsurercoverageMdl.filterTravelInsurerCoverage(function(travelinsurercoverage, callback2){

      count--;

      async.forEach(travelinsurercoverage, function(item2, callback3) {

        retValTravelInsurerAndCoverageList.push({

          //I have shorted the list below, to 
          //get a better overview of the code
          //travel_insurer
          _id: item._id,
          name: item.name

          //travel_insurercoverage                        
          adventuresport: item2.adventuresport,
          accidents: item2.accidents,
          cashcoverageextraamount: item2.cashcoverageextraamount

          //extra fields
          familytype: item.familytype
        });

        if(count == 0) {
          return callback(); //if count is subtracted completely, then the list is finished and can be calledback to the res.send function.
        }
      }, callback1); //callback to retValTravelInsurerList to get the next item in the array.
    });
  });
}],
function(err) {
  if(err){
    return (err);
  } else {
    res.send(JSON.stringify(retValTravelInsurerAndCoverageList));
  }
});

下面是声明的函数filterTravelInsurerOverage,它由内部async.forEach调用。。。

   async.series([

    function(callback)
    {
        //define the model
        var travelinsurercoverageModel = conn.model('travel_insurercoverages', schema);

        //define the query
        var query = travelinsurercoverageModel.find();

        //build dynamic where
        if(utilnull.isItemNullValue(locals._cancellation3000))
        { query.where({'Cancellation3000': {'$gte' : 0}}); }
        if(utilnull.isItemNullValue(locals._motoristaid))
        { query.where({'MotoristAid': {'$gte' : 0}}); }
        if(utilnull.isItemNullValue(locals._businesstravel))
        { query.where({'BusinessTravel': {'$gte' : 0}}); }
        if(utilnull.isItemNullValue(locals._extendedtravelperiod))
        { query.where({'ExtendedTravelPeriod': {'$gte' : 0}}); }
        if(utilnull.isItemNullValue(locals._extendedtravelprice))
        { query.where({'ExtendedTravelPrice': {'$gte' : 0}}); }

        //execute query
        query.exec(function (err, reis) {
            if (err) return callback(err);

            reis.forEach(function(item) {

                retVal.push({
                    _id: item.id,
                    insuranceidref: item.InsuranceIDREF,
                    familytype: item.FamilyType,
                    basepriceeurope: item.BasePriceEurope,
                    businesstravel: item.BusinessTravel,
                    extendedtravelperiod: item.ExtendedTravelPeriod,
                    extendedtravelprice: item.ExtendedTravelPrice
                });
            });
            callback();
        })
    }
    ],
    function(err)
    {
        if(err){
            return err;
        }
        else {
            callback(retVal);
        }
    }
    );