小编yac*_*uat的帖子

/* error handler that will be used below in pipe with catchError() 
 * when resource fetched with HttpClient get() */

private _handleError<T> (operation: string, result?:T) {
     return( error: any): Observable<T> => {
          console.error( operation + ' ' + error.message );
          // or something else I want to do
          return of(result as T); // lets me return innocuous results
     }
}

getObjects() {
  return this.http.get<any[]>(this.myUrl).pipe(
    catchError(this._handleError('my error', [])
  );
}

现在tap用于处理错误

getObjects() {
  return this.http.get<any[]>(this.myUrl).pipe(
    tap( objects => { …