$.ajax({
                        type: "POST",
                        url: "xxx.asmx/GetYYXX",
                        contentType: "application/json;utf-8",
                        dataType: "json",
                        data: "{YYHM:'" + yyhm + "'}",
                        success: function (result) {
                          // doSomeThing()  如何在这里取得 result.d里面的值？

                        },

通过调试得到 result.d的值是："{"brxm":"aa","ys":"bb","ks":"cc","hm":"123","sj":"08:50"}"

问题是，如何取到这段json里面的值， 比如要取得  “aa” ，我用了 result.d.brxm, result.d[0].brxm 等等都取不到，eval(result.d)也不行，请教一下这里的各位达人，小弟菜鸟，谢谢先。