BackboneJS使ID整数

I'm using JSON.stringify and JSON.parse to edit my JSON file based on changes to an online database. Everything works right, except it is making quotes around a number which is screwing up the JSON file. For example it should be "id": 1 but it is printing out "id": "1". How would I edit the quotes out? I prefer to use JSON.stringify and not an alternative.

Here is where I'm stringifying it and using BackboneJS:

var Territories = Backbone.Collection.extend({
  model: Territory,
  url: "examples/olympics.json",
  initialize: function () {
    Backbone.Model.prototype.initialize.apply(this, arguments);
    this.on("change", function (model, options) {
      var data1 = JSON.stringify(this); 
      obj = JSON.parse(data1);
      $.ajax({url:"testingphp.php",type:"POST",data:{
        "data3":obj
      }
    });
    if (options && options.save === false) return;
    });
  }
});