JSONArray 处理问题

后台log info :打印的是这样的数据 [[{"CompanyId":1,"EndTime":2010-04-16}],[{"ConpamyInfoId":1,"ConpamyInfoName":文员}]]

在客户端用alert() 打印：
$.each(json, function(i, m) {
$.each(m, function(j, n) {
alert("CompanyId:"+n.CompanyId);
alert("EndTime:"+n.EndTime);
alert("ConpamyInfoId:"+n.ConpamyInfoId);
alert("ConpamyInfoName:"+n.ConpamyInfoName);
});
});

会出现 CompanyId:1 ,EndTime:2010-04-16 ,CompanyInfoId:undefined ,ConpamyInfoName:undefined
CompanyId:undefined ,EndTime:undefined6 ,CompanyInfoId:1 ,ConpamyInfoName:文员

请问怎么遍历能 出现 CompanyId:1 ,EndTime:2010-04-16 ,CompanyInfoId:1 ,ConpamyInfoName:文员

$.each(json, function(i, m) {
$.each(m, function(j, n) {
alert(j + ":" + n[j]);
});
});