Question

I want to move “data” variable to out of success function for other operation.

$("a[class=note]").click(function( evt ){
                    var note = $(this).attr("value");
                    var preid = $(this).attr("id");
                    $.ajax({
                        type: 'GET',
                        url: 'style/ajax.php',
                        data: 'do=note&value=' + note + '&preid=' + preid,
                        success: function(data)
                        {
                            alert(data);
                        }
                    });
                });

For example php have Global pharase..

Answer 1

global var(which is the worse solution, but this is what you asked for):

$("a.note").click(function( evt ){
                var note = $(this).attr("value");
                var preid = $(this).attr("id");
                $.ajax({
                    type: 'GET',
                    url: 'style/ajax.php',
                    data: 'do=note&value=' + note + '&preid=' + preid,
                    success: function(data)
                    {
                        window.data = data;
                        alert(data);
                    }
                });
            });

global variable are dangerous, Maybe variable outside the success scope is enough?
Var outside the success callback:

$("a.note").click(function( evt ){
                var note = $(this).attr("value");
                var preid = $(this).attr("id");
                var dataFromServer = null;
                $.ajax({
                    type: 'GET',
                    url: 'style/ajax.php',
                    data: 'do=note&value=' + note + '&preid=' + preid,
                    success: function(data)
                    {
                        dataFromServer = data;
                        alert(data);
                    }
                });
            });

Last option is to have a hidden input that will store the data;

                    success: function(data)
                    {
                        $('#hiddenFieldId').val(data);
                        alert(data);
                    }

Things to notice:

1. I changed your selector from a[class=note] to a.note which is better.
2. success is a callback which means it will not be fired until the response reach the client, until then your global\outside var\hidden input value will be null. if you don’t want the ajax to be asynchronous you can define it in the options like this:

---

  $.ajax({
    async: false, //  <---
    type: 'GET',
    url: 'style/ajax.php',
    data: 'do=note&value=' + note + '&preid=' + preid,
    success: function(data)
    {
        dataFromServer = data;
        alert(data);
    }
});