javascript - Returns undefined when attempting to run JQuery -

$.getjson('http://robloxplus.com:2052/inventory?username=itracking',   function(data){  $.each(data, function(item){  console.log(item['id']) }); });` 

returns undefined when attempting run on external website. supposed output each id of every item in list (http://robloxplus.com:2052/inventory?username=itracking)

how fix this?

edits>

i want iterate on each individual id, each of these numbers "168167114": , "135470963": etc. etc. , fetch data follows (i.e. name:"", totalserial:"")

is request being made on same domain robloxplus.com ?
i'm new this.. don't understand javascript and/or jquery. @pedro lobito no, it's not. –

explanation:

http requests javascript traditionally bound same origin policy, means ajax requests must have same domain , port. common ways around json-p, proxying , message passing via s. these have quirks, thing have in common legacy browser support.

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solution

1 - if robloxplus.com yours, can enable cors

2 - if not, can use yql (yahoo! query language) bypass cors

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when 1 of above options fulfilled, can make json request, i.e.:

$.ajax({     url: 'http://robloxplus.com:2052/inventory?username=itracking',     type: 'get',     datatype: 'json',     success: function(data) {        $.each(data.id, function(item) {         console.log(item);         });     },     error: function(e) {         console.log(e.message);     } });