intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    const token = AuthStorage.getItem('mano');
    const token_snap = AuthStorage.getItem('mano_snap');
    req = req.clone({
      setHeaders: {
        'APIKEY': '33726880C9CE84E67A5C27BD4A2CE91AD2',
        'token': token ? token : token_snap || 'mano'
      }
    });
    return next.handle(req).pipe(
      catchError(this.handleError)
    );
  }

  handleError(error: HttpErrorResponse) {
    console.log(this);    // 此時(shí)的this指向
    const code = error['status'];
    if (code === 401 || code === 417) {
      Auth.loginOut();
    }
    const err = {url: error['url'], status: error['status'], msg: error['error'].msg};
    return new ErrorObservable(err);
  }

在handleError方法中怎么調(diào)用其它方法呢？