包含城市及地区的名称及邮编，有层级结构。 [{ "id": 2, "name": "北京", "child": [{ "id": 36, "name": "北京市", "child": [{ "id": 377, "name": "东城区", "zipcode": "100011" }, { "id": 378, "name": "西城区", "zipcode": "100032" }, { "id": 379, "name": "崇文区", "zipcode": "100061" }, {