$.ajax

                    (

                        {

                            type: "post",

                            url: urlAdd,

                            dataType: "jeson",  //传输的数据类型

                            contentType: "application/json",

                            data: '{"state":"' + val + '"}',

                            error: function (x, e) {

                                alert(x.responseText);

                                return false;

                            },

                            success: function (data) {

                                alert("OK");

                                var i;

                                var json = eval(data);