AlertDialog action回调里调用router.back()不生效

AlertDialog.show( 
  { 
    title: 'test', 
    message: 'test', 
    autoCancel: true, 
    alignment: DialogAlignment.Center, 
    gridCount: 4, 
    showInSubWindow: true, 
    offset: { dx: 0, dy: -20 }, 
    buttonDirection: DialogButtonDirection.HORIZONTAL, 
    buttons: [ 
      { 
        value: CommonUtils.getStringData($r('app.string.txy_dialog_ok')), 
        action: () => { 
          router.back(); //====================================> 不生效 
        } 
      } 
    ] 
  } 
)