code: def jsapi_ticket(self):
          
          self._check_appid_appsecret()
  
          if callable(self.__jsapi_ticket_getfunc):
              self.__jsapi_ticket, self.__jsapi_ticket_expires_at = self.__jsapi_ticket_getfunc()
  
          if self.__jsapi_ticket:
              now = time.time()
              if self.__jsapi_ticket_expires_at - now > 60:
                  return self.__jsapi_ticket
  
          self.grant_jsapi_ticket()  # 从腾讯服务器获取 jsapi ticket 并更新
          return self.__jsapi_ticket
docs: 获取当前 jsapi ticket 值, 本方法会自行维护 jsapi ticket 有效性