docs: def get_jsapi_ticket(self):
          """
          获取微信 JS-SDK ticket
  
          该方法会通过 session 对象自动缓存管理 ticket
  
          :return: ticket
          """
          ticket_key = '{0}_jsapi_ticket'.format(self.appid)
          expires_at_key = '{0}_jsapi_ticket_expires_at'.format(self.appid)
          ticket = self.session.get(ticket_key)
          expires_at = self.session.get(expires_at_key, 0)
          if not ticket or expires_at < int(time.time()):
              jsapi_ticket_response = self.get_ticket('jsapi')
              ticket = jsapi_ticket_response['ticket']
              expires_at = int(time.time()) + int(jsapi_ticket_response['expires_in'])
              self.session.set(ticket_key, ticket)
              self.session.set(expires_at_key, expires_at)
          return ticket