def fetch(self): login_url = 'http://lib.ecjtu.jx.cn/gdweb/ReaderTable.aspx' history_url = 'http://lib.ecjtu.jx.cn/gdweb/HisdoryList.aspx?PageNo='+str(self._page) r = Request() r.setCookie(self.username,self.password).get(login_url) self._html = r.get(history_url) return self