获取可换地区列表

{
    "code": 0,
    "msg": "OK",
    "data": [
        {
            "title": "全国随机",
            "city_id": -3,
            "province_name": "全国随机",
            "isp": "",
            "remain_count": 10545
        },
        {
            "title": "西安市电信Max",
            "city_id": 489,
            "province_name": "陕西省",
            "isp": "电信",
            "remain_count": 95
        },
        {
            "title": "重庆市移动Max",
            "city_id": 562,
            "province_name": "重庆",
            "isp": "移动",
            "remain_count": 124
        },
        {
            "title": "临沂市联通Max",
            "city_id": 707,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 140
        },
        {
            "title": "南通市电信Max",
            "city_id": 522,
            "province_name": "江苏省",
            "isp": "电信",
            "remain_count": 59
        },
        {
            "title": "武汉市移动Max",
            "city_id": 515,
            "province_name": "湖北省",
            "isp": "移动",
            "remain_count": 99
        },
        {
            "title": "青岛市联通Max",
            "city_id": 706,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 153
        },
        {
            "title": "重庆市电信Max",
            "city_id": 439,
            "province_name": "重庆",
            "isp": "电信",
            "remain_count": 82
        },
        {
            "title": "济宁市联通Max",
            "city_id": 905,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 82
        },
        {
            "title": "德州市联通Max",
            "city_id": 649,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 84
        },
        {
            "title": "遵义市移动Max",
            "city_id": 944,
            "province_name": "贵州省",
            "isp": "移动",
            "remain_count": 94
        },
        {
            "title": "天津市联通Max",
            "city_id": 412,
            "province_name": "天津",
            "isp": "联通",
            "remain_count": 59
        },
        {
            "title": "无锡市电信Max",
            "city_id": 453,
            "province_name": "江苏省",
            "isp": "电信",
            "remain_count": 77
        },
        {
            "title": "德州市移动Max",
            "city_id": 967,
            "province_name": "山东省",
            "isp": "移动",
            "remain_count": 81
        },
        {
            "title": "菏泽市联通Max",
            "city_id": 765,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 89
        },
        {
            "title": "泰安市联通Max",
            "city_id": 886,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 85
        },
        {
            "title": "海口市电信Max",
            "city_id": 601,
            "province_name": "海南省",
            "isp": "电信",
            "remain_count": 57
        },
        {
            "title": "潍坊市联通Max",
            "city_id": 687,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 80
        },
        {
            "title": "大连市移动Max",
            "city_id": 851,
            "province_name": "辽宁省",
            "isp": "移动",
            "remain_count": 68
        },
        {
            "title": "西宁市电信Max",
            "city_id": 1402,
            "province_name": "青海省",
            "isp": "电信",
            "remain_count": 88
        },
        {
            "title": "聊城市联通Max",
            "city_id": 686,
            "province_name": "山东省",
            "isp": "联通",
            "remain_count": 70
        },
        {
            "title": "贵阳市联通Max",
            "city_id": 741,
            "province_name": "贵州省",
            "isp": "联通",
            "remain_count": 81
        },
        {
            "title": "武汉市电信Max",
            "city_id": 501,
            "province_name": "湖北省",
            "isp": "电信",
            "remain_count": 72
        },
        {
            "title": "沧州市联通Max",
            "city_id": 513,
            "province_name": "河北省",
            "isp": "联通",
            "remain_count": 65
        },
        {
            "title": "郑州市移动Max",
            "city_id": 521,
            "province_name": "河南省",
            "isp": "移动",
            "remain_count": 68
        },
        {
            "title": "北京市联通Max",
            "city_id": 459,
            "province_name": "北京",
            "isp": "联通",
            "remain_count": 53
        },
        {
            "title": "南宁市移动Max",
            "city_id": 934,
            "province_name": "广西",
            "isp": "移动",
            "remain_count": 52
        },
        {
            "title": "淮安市电信Max",
            "city_id": 429,
            "province_name": "江苏省",
            "isp": "电信",
            "remain_count": 58
        },
        {
            "title": "毕节市移动Max",
            "city_id": 1190,