code: func (oauth *Oauth) GetUserInfo(accessToken, openID string) (result UserInfo, err error) {
  	urlStr := fmt.Sprintf(userInfoURL, accessToken, openID)
  	var response []byte
  	response, err = util.HTTPGet(urlStr)
  	if err != nil {
  		return
  	}
  	err = json.Unmarshal(response, &result)
  	if err != nil {
  		return
  	}
  	if result.ErrCode != 0 {
  		err = fmt.Errorf("GetUserInfo error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
  		return
  	}
  	return
  }
docs: //GetUserInfo 如果scope为 snsapi_userinfo 则可以通过此方法获取到用户基本信息