Not able to access variables outside ajax call

Question

I am accessing json data from other domain using JSONP with callback function.

I am able to access data and in success function i am pushing json data to a array (items[ ]) but i am not able to access that array outside ajax call function.

How can i access the Items[ ] array outside ajax call. below is the code.

Thanks in advance

$.ajaxSetup({ "async": false });

            var items = [];


            $.ajax({
                type: "GET",
                url: "http://aaa.com/.wrf=callback",
                //data: "{}",
                crossDomain: true,
                jsonpCallback: 'callback',
                contentType: "application/json; charset=utf-8",
                dataType: "jsonp",
                success: function (msg) {

                    $.each(msg.response.docs, function (key, value) {

                        items.push([this["ID"]]);

                        return items;

                    });
                },

                async: false,
                error: function (msg) {
                    alert(msg);
                }
            });