### 发现话题 ~~~[api] post:http://api.satin.com/api/v1/categoryFollow *user_id=c64148def264f925f000b4943da1ce1f,#用户id 选填 *pid=2,#分类id <<< scucess { "code": 200, "msg": "关注分类成功", "data": [] } <<< error { "code": 400, "msg": "关注失败", "data": [] }