nativescript: new object is not an new an empty opject - nativescript

Question

As example only.
I have:
var ListingModel = require("~/shared/view-models/listing-view-model");
function listing10(){
var Listing = new ListingModel.ListingViewModel();
Listing.horizontalAddData('10');
frameModule.topmost().navigate("/views/listing/list");
}
function listing20(){
var Listing = new ListingModel.ListingViewModel();
Listing.horizontalAddData('20');
frameModule.topmost().navigate("/views/listing/list");
}
function listing50(){
var Listing = new ListingModel.ListingViewModel();
Listing.horizontalAddData('50');
frameModule.topmost().navigate("/views/listing/list");
}
exports.listing10 = listing10;
exports.listing20 = listing20;
exports.listing50 = listing50;
When i now tap on event listing10 i receive all information which i require.
But, when i now tap event listing20 i become back the information from listing10 and listing20. That means, the the new object isnt a new object with cleared data?
Question: How i must call the new ListingModel.ListingViewModel(); so that i really become back a new, clear ListingViewModel Object?

Answer 1

var __extends = this.__extends || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
__.prototype = b.prototype;
d.prototype = new __();
};
var Model = require('~/shared/view-models/view-model');
var ListingViewModel = (function (_super) {
__extends(ListingViewModel, _super);
function ListingViewModel() {
_super.apply(this, arguments);
}
var params = {start: 0 , limit: 7};
var page = 0;
var _listRequested = new virtualArray.VirtualArray(7);
_listRequested.loadSize = params.limit;
var _fetch = new f.fetchHelper();
var loading = 0;
var that=this;
var indexes = [];
var horizontalindex = [];
var fetchlist = [];
var listing ='';
Object.defineProperty(ListingViewModel.prototype, "list", {
get: function () {
return _listRequested;
},
enumerable: true,
configurable: true
});
ListingViewModel.prototype.horizontalAddData = function(val) {
listing = val;
that.loadItems();
};
loadItems = function (args) {
if(loading == 1) return;
loading = 1;
fetchlist = [];
var url = config.apiUrl + '?t=listing'
+ '&listing=' + list
+ '&start=' + params.start
+ '&limit=' + params.limit;
_fetch.getJSON(url).then(function (res) {
try {
for (var i = 0; i < res.list.length; i++) {
var am = new Model.Model(res.list[i]);
fetchlist.push(am);
}
_listRequested.length = _listRequested.length + fetchlist.length;
_listRequested.load(params.start, fetchlist);
} catch (e) {
alert('error' + e);
}
params.start = params.start + params.limit;
loading = 0;
});
};
return ListingViewModel;
})(observable.Observable);
exports.ListingViewModel = ListingViewModel;