长链接/短链接转换

# 长链接转短链接 ```javascript WXAPI.shortUrlV2(url) ``` + url 长链接地址 ```json { "code": 0, "data": "http://t.cn/A6K8InrI", "msg": "success" } ``` # 短链接反查长链接 ```javascript WXAPI.shortUrlExpand(url) ``` + url 端链接地址编号，或者整个短链接地址 ```json { "code": 0, "data": "https://www.baidu.com/", "msg": "success" } ```