json问题,高手进.

 "T000032530": {
        "transit_id": "T000032530",
        "transit_name": "4e2a4eba8f664e3b38f666e90",
        "vehicle_owner_id": "p_vehicle3",
        "vehicle_owner_name": "4e2a4eba8f664e3b3",
        "contact_man_tel_no": "0731-28874501",
        "reputation_value": null,
        "reputation_level": null,
        "vehicle_id": "V000032533",
        "carrying_type": "01|02|03|04|05|06",
        "carrying_type_name": "666e901a8d277269,59274ef68d277269,537196698d277269,9c9c6d3b66138150,4fdd966951b785cf,5feb901f8d277269",
        "vehicle_no": "6caaBX0009",
        "vehicle_type": "01",
        "vehicle_type_name": "666e901a",
        "box_type": "01",
        "box_type_name": "7bb15f0f8f66",
        "load_weight": "0",
        "load_length": "5",
        "load_width": "4",
        "load_height": "3",
        "path_detail": "4e0a6d775e025e028f96533a6d664e1c65b0533a--->65e095215e025d075b89533a",
        "freight": "",
        "freight_unit": "",
        "transit_pay_method": null,
        "pay_method_name": "",
        "user_pay_type": null,
        "user_pay_type_name": "",
        "can_load": "1",
        "can_load_name": "53ef",
        "re": "",
        "path_id": "P000032570",
        "can_load_weight": "0",
        "can_load_height": "3",
        "can_load_length": "5",
        "can_load_width": "4",
        "vehicle_status": "3",
        "vehicle_status_name": "6ee18f7d",
        "toll_fee": "200",
        "journey_time": "8",
        "totle_journey_time": "8",
        "freight_percent": "50",
        "cargo_type_experience": "65e0",
        "path_experience": "65e0",
        "delivery_province": "31",
        "delivery_city": "3101",
        "delivery_county": "310115",
        "delivery_day_from": "2010/09/16",
        "delivery_time_from": "",
        "delivery_day_to": "2010/09/16",
        "delivery_time_to": "",
        "arrive_province": "32",
        "arrive_city": "3202",
        "arrive_county": "320202",
        "arrive_day_from": "2010/09/16",
        "arrive_time_from": "",
        "arrive_day_to": "2010/09/16",
        "arrive_time_to": "",
}
如何用js找到delivery_province 然后更改值. 求解.