完整示例代码分享：

{
    "reason": "success",
    "result": [
        {
            "province_name": "北京市",
            "province_code": "110000",
            "citys": [
                {
                    "province_code": "110000",
                    "city_name": "北京市",
                    "city_code": "110100"
                },
                {
                    "province_code": "110000",
                    "city_name": "东城区",
                    "city_code": "110101"
                },
                {
                    "province_code": "110000",
                    "city_name": "西城区",
                    "city_code": "110102"
                },
                {
                    "province_code": "110000",
                    "city_name": "朝阳区",
                    "city_code": "110105"
                },
                {
                    "province_code": "110000",
                    "city_name": "丰台区",
                    "city_code": "110106"
                },
                {
                    "province_code": "110000",
                    "city_name": "石景山区",
                    "city_code": "110107"
                },
                {
                    "province_code": "110000",
                    "city_name": "海淀区",
                    "city_code": "110108"
                },
                {
                    "province_code": "110000",
                    "city_name": "门头沟区",
                    "city_code": "110109"
                },
                {
                    "province_code": "110000",
                    "city_name": "房山区",
                    "city_code": "110111"
                },
                {
                    "province_code": "110000",
                    "city_name": "通州区",
                    "city_code": "110112"
                },
                {
                    "province_code": "110000",
                    "city_name": "顺义区",
                    "city_code": "110113"
                },
                {
                    "province_code": "110000",
                    "city_name": "昌平区",
                    "city_code": "110114"
                },
                {
                    "province_code": "110000",
                    "city_name": "大兴区",
                    "city_code": "110115"
                },
                {
                    "province_code": "110000",
                    "city_name": "怀柔区",
                    "city_code": "110116"
                },
                {
                    "province_code": "110000",
                    "city_name": "平谷区",
                    "city_code": "110117"
                },
                {
                    "province_code": "110000",
                    "city_name": "密云区",
                    "city_code": "110118"
                },
                {
                    "province_code": "110000",
                    "city_name": "延庆区",
                    "city_code": "110119"
                }
            ]
        }
    ],
    "error_code": 0
}