Accessing variable outside on load function

Question

Hi I am working Android application development using titanium studio.I have developed small application.my problem is that I can not access variable which is define inside the xhr.on load.I used following code:

xhr.onload = function()
{
var json = this.responseText;
var to_array = JSON.parse(json);
var to_count = to_array.length;
};

I want to access to_count and to_array outside onload function and pass it to another child window.For that I used following code:

var feedWin = Titanium.UI.createWindow({
    url:'home/feed.js'
});//alert(to_count);
feedwin.to_array = to_array;
feedwin.to_count = to_count;