code: func (oauth *Oauth) GetQyRedirectURL(redirectURI, agentid, scope, state string) (string, error) {
  	//url encode
  	urlStr := url.QueryEscape(redirectURI)
  	return fmt.Sprintf(qyRedirectOauthURL, oauth.AppID, urlStr, scope, agentid, state), nil
  }
docs: //GetQyRedirectURL 获取企业微信跳转的url地址