code: func (user *User) ListAllUserOpenIDs() ([]string, error) {
  	nextOpenid := ""
  	openids := []string{}
  	count := 0
  	for {
  		ul, err := user.ListUserOpenIDs(nextOpenid)
  		if err != nil {
  			return nil, err
  		}
  		openids = append(openids, ul.Data.OpenIDs...)
  		count += ul.Count
  		if ul.Total > count {
  			nextOpenid = ul.NextOpenID
  		} else {
  			return openids, nil
  		}
  	}
  }
docs: // ListAllUserOpenIDs 返回所有用户OpenID列表