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
