我想到了。这是Navigator.pushAndRemoveUntil功能。我必须将PaymentSuccessful小部件作为传递newRoute，将"/Home"路线作为谓词传递

  _navPaymentSuccessful(){
    Navigator.pushAndRemoveUntil(
      context, 
      MaterialPageRoute(
        builder: (context) => PaymentSuccessful()
      ), 
     ModalRoute.withName("/Home")
    );
  }