1$.ajax({
2        type: "post",
3        url: "ajax/example.php",
4        data: 'page=' + btn_page,
5        success: function (data) {
6            var a = data; 
7            $.ajax({
8                type: "post",
9                url: "example.php",
10                data: 'page=' + a,
11                success: function (data) {
12
13                }
14                error: function (xhr) {
15                   console.log(xhr.responseText); //saves alot of time during debugging
16                }
17            });
18        }
19    });
20