jquery ajax嵌套ajax 的问题

            $.post("../ajax/CrossDomain.ashx",

                               { Action: 2,

                                   Mobile: Mobile,

                                   Message: $("#Message").val()

                               },

                                function (data) {

                                    //alert(data);

                                    $.post("../ajax/EditData.ashx?TableName=EditSMS",

                                           { FCompany: rows[i].JSON_fcompany,

                                               Mobile: Mobile,

                                               Message: $("#Message").val(),

                                               FState: data

                                           }, function (data2) { alert(FCompany + Mobile + Message + FState + data2) });

                                    $("#tab_list").datagrid("reload");

                                });

利用第一个里面的返回值 ，二次执行ajax，第二次没有执行，为什么，求高手解