Aspx Ajax 调用 C#函数处理数据

jquery ajax 调用后台函数

         var res;
         $.ajax({
             type: "POST",
             url: "fast_index_overview.aspx/GetOverViewZongLunContent",
             data: "{city:'" + regionCityName + "',time:'" + time + "'}",
             contentType: "application/json",
             dataType: "json",
             async: false,
             success: function (result) {
                 try {
                     res = eval('(' + result.d + ')')[0];

                 } catch (e) {

                 }
             },
             error: function(err) {
                 res = "错误：" + err.d;
             }
         });

         console.log("获取数据:" + res);