get html

        :param apart_id: 栋数
        :param meter_room: 宿舍号

def _get_electricity_info_html( apart_id, meter_room):
        """get html

        :param apart_id: 栋数
        :param meter_room: 宿舍号
        """
        if apart.get(apart_id) is None:
            raise KeyError('not support the apart_id= ' + apart_id)
        post_data = {
            'action': 'search',
            'apartID': apart.get(apart_id),
            'meter_room': apart_id + meter_room
        }
        r = requests.post('http://202.192.252.140/index.asp', data=post_data)
        return r.content.decode(_.get_charset(r.content))