js拼接？
如下json字串：

var json = [{"time":"2013-11-11","gn":"自定义分组1","inCount":261},{"time":"2013-11-12","gn":"自定义分组1","inCount":654},,{"time":"2013-11-11","gn":"自定义分组2","inCount":152},{"time":"2013-11-12","gn":"自定义分组2","inCount":362}]

想把　　自定义分组1　拼在一起
自定义分组2  拼在一起

最后成这样：[{"time":["2013-11-11","2013-11-12"],"gn":"自定义分组1","inCount":[261,654]},{"time":["2013-11-11","2013-11-12"],"gn":"自定义分组2","inCount":[152,362]}]

怎么样拼？谢谢．
------解决方案--------------------
把里面的json循环输出，重新拼接成新的JSON！
------解决方案--------------------
序列化，做逻辑处理
再反序列化