ios - json数组解析失败

[{"vehicleNum":"\u9c81Q24956","shipDtPlan":Wed Jan 14 14:15:00 CST 2015,"orderCode":"20150117104","originAddress":"345","consigneeTelphone":"","goodsQuantity":234,"consigneePhoneNum":"","userName":"","limitHours":62,"goodsWeight":234,"goodsUnit":"234","driverName":"\u5f20\u4e09","orderId":104,"createDt":Sat Jan 17 00:00:00 CST 2015,"customerName":"3\u989d\u5934\u513f\u7ae5","overdueDt":Tue Jan 20 04:15:44 CST 2015,"consigneeName":"","customerPhoneNum":"13000000001","collPayRemark":"","customerCompany":"345","transactor":"","sendTime":Thu Jan 15 00:00:00 CST 2015,"origin":"345                                               ","orderStatus":2,"deliveryReamrk":"","destination":"","consigneeCompany":"","driverPhoneNum":"13511111111","destinationAddress":"","arriveDtPlan":Sat Jan 17 00:00:00 CST 2015,"goodsName":"rwerw"},


{"vehicleNum":"\u9c81Q24956","shipDtPlan":Wed Jan 14 13:25:00 CST 2015,"orderCode":"20150115105","originAddress":"345","consigneeTelphone":"","consigneePhoneNum":"","goodsWeight":234,"goodsUnit":"234","driverName":"\u5f20\u4e09","orderId":105,"createDt":Thu Jan 15 13:25:25 CST 2015,"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=[strJson objectFromJSONString];

返回的是null，转换成data 用

ret = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];

也不能转换成数组，本人较菜，望大神不吝赐教。