Get next-level geographic information

```javascript WXAPI.nextRegionV2(pid) ``` + pid passes the parent’s location id ```json { "code": 0, "data": [ { "firstLetter": "h", "id": "330100000000", "jianpin": "hzs", "level": 2, "name": "Hangzhou City", "nameEn": "Hangzhou", "pid": "330000000000", "pinyin": "hangzhoushi" }, { "firstLetter": "n", "id": "330200000000", "jianpin": "nbs", "level": 2, "name": "Ningbo City", "nameEn": "Ningbo", "pid": "330000000000", "pinyin": "ningboshi" } ], "msg": "success" } ```