在回调函数中定义httpResponse时遇到问题

Question

我正在使用一个承诺为matchCenterItem的每个实例创建httpRequest函数，将它们推入一个数组，然后连续运行它们。我想要做的是收集每个函数的httpResponse，并将它们推送到ebayPingResults数组。当我运行这个时，我收到一个错误，说明以下内容：

Failed with: TypeError: Cannot read property 'text' of undefined
    at collectEbayResults (main.js:444:57)
    at null.<anonymous> (main.js:450:15)
    at e (Parse.js:2:5101)
    at c.extend.then (Parse.js:2:5447)
    at main.js:439:40
    at e (Parse.js:2:5101)
    at Parse.js:2:4651
    at Array.forEach (native)
    at Object.x.each.x.forEach [as _arrayEach] (Parse.js:1:665)
    at c.extend.resolve (Parse.js:2:4602)

它指的是这样的： var httpresponse = JSON.parse(httpResponse.text);

这是完整的代码：

Parse.Cloud.define("MatchCenterTest", function(request, response) {

    //defines which parse class to iterate through
    var matchCenterItem = Parse.Object.extend("matchCenterItem");
    var query = new Parse.Query(matchCenterItem);
    var promises = [];
    //setting the limit of items at 10 for now
    query.limit(10);
    query.find().then(function(results) {

      for (i=0; i<results.length; i++) {
          console.log(results[i].get('searchTerm'))

          url = 'http://svcs.ebay.com/services/search/FindingService/v1';
            //push function containing criteria for every matchCenterItem into promises array
          promises.push(function() {
            return Parse.Cloud.httpRequest({
              url: url,
              params: {
                'OPERATION-NAME' : 'findItemsByKeywords',
                'SERVICE-VERSION' : '1.12.0',
                'SECURITY-APPNAME' : '*APP ID GOES HERE*',
                'GLOBAL-ID' : 'EBAY-US',
                'RESPONSE-DATA-FORMAT' : 'JSON',
                'REST-PAYLOAD&sortOrder' : 'BestMatch',
                'paginationInput.entriesPerPage' : '3',
                'outputSelector=AspectHistogram&itemFilter(0).name=Condition&itemFilter(0).value(0)' : results[i].get('itemCondition'),
                'itemFilter(1).name=MaxPrice&itemFilter(1).value' : results[i].get('maxPrice'),
                'itemFilter(1).paramName=Currency&itemFilter(1).paramValue' : 'USD',
                'itemFilter(2).name=MinPrice&itemFilter(2).value' : results[i].get('minPrice'),
                'itemFilter(2).paramName=Currency&itemFilter(2).paramValue' : 'USD',
                //'itemFilter(3).name=LocatedIn&itemFilter(3).Value' : request.params.itemLocation,
                'itemFilter(3).name=ListingType&itemFilter(3).value' : 'FixedPrice',
                'keywords' : results[i].get('searchTerm'),
              }
            });
          });
      }
      console.log(promises);

      Parse.Promise.when(promises).then(function(results){

        var ebayPingResults = [];

        function collectEbayResults (httpResponse){
          var httpresponse = JSON.parse(httpResponse.text);
          ebayPingResults.push(httpresponse);
        }

        for (i=0; i<promises.length; i++)
          {
            collectEbayResults(httpresponse);
          }

        console.log(ebayPingResults);
        response.success(
          {
            "Top 3": ebayPingResults
          }
        );

      }, function(err) {
          console.log('error!');
          response.error('DAMN IT MAN');
          });
    });
});

我已经编写了一个以这种方式为成功函数引用httpResponse的前一个函数，它工作正常，不确定为什么它在这种情况下不起作用。