获取图书借阅页面
        :param ctrlno:
        :return:

def __book_status_html(self, ctrlno):
        """
        获取图书借阅页面
        :param ctrlno:
        :return:
        """
        _params = {
            'ctrlno': ctrlno
        }
        _headers = {
            'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
            'Accept-Encoding': 'gzip, deflate, sdch',
            'Accept-Language': 'zh-CN,zh;q=0.8,en;q=0.6,zh-TW;q=0.4',
            'Host': 'lib.wyu.edu.cn',
            'Referer': 'http://lib.wyu.edu.cn/opac/searchresult.aspx'
        }
        r = requests.get(url=WyuLibrary.url_book_info, headers=_headers, params=_params, timeout=self._timeout)
        # _.d(r.content.decode(_.get_charset(r.content)))
        return r.content.decode(_.get_charset(r.content))