json数组解析失败

Question

[{"vehicleNum":"\u9c81Q24956","shipDtPlan":WedJan1414:15:00CST2015,"orderCode":"20150117104","originAddress":"345","consigneeTelphone":"","goodsQuantity":234,"consigneePhoneNum":"","userName":"","limitHours":62,"goodsWeight":234,"goodsUnit":"234","driverName":"\u5f20\u4e09","orderId":104,"createDt":SatJan1700:00:00CST2015,"customerName":"3\u989d\u5934\u513f\u7ae5","overdueDt":TueJan2004:15:44CST2015,"consigneeName":"","customerPhoneNum":"13000000001","collPayRemark":"","customerCompany":"345","transactor":"","sendTime":ThuJan1500:00:00CST2015,"origin":"345","orderStatus":2,"deliveryReamrk":"","destination":"","consigneeCompany":"","driverPhoneNum":"13511111111","destinationAddress":"","arriveDtPlan":SatJan1700:00:00CST2015,"goodsName":"rwerw"},
{"vehicleNum":"\u9c81Q24956","shipDtPlan":WedJan1413:25:00CST2015,"orderCode":"20150115105","originAddress":"345","consigneeTelphone":"","consigneePhoneNum":"","goodsWeight":234,"goodsUnit":"234","driverName":"\u5f20\u4e09","orderId":105,"createDt":ThuJan1513:25:25CST2015,"customerName":"3\u989d\u5934\u513f\u7ae5","consigneeName":"","customerPhoneNum":"13000000001","collPayRemark":"","customerCompany":"345","transactor":"","origin":"345","orderStatus":1,"destination":"","consigneeCompany":"","deliveryReamrk":"","driverPhoneNum":"13511111111","destinationAddress":"","goodsName":"234234"}]
返回的json是nsstring格式的，用asi接收有乱码，但是用
NSArray*arrlist=[strJsonobjectFromJSONString];
返回的是null，转换成data用
ret=[NSJSONSerializationJSONObjectWithData:jsonDataoptions:NSJSONReadingMutableContainerserror:nil];
也不能转换成数组，本人较菜，望大神不吝赐教。