Angular2 rxjs - switchmap catch错误

使用catchError方法

this.authService.refreshToken()
  .pipe(
     switchMap(() => {...}),
     catchError((e) => {
       // handle e and return a safe value or re-throw
       if (isCritical(e)) {
         return throwError(e);
       }
       return of([]);
    })
  );