鸿蒙router路由,单例、普通模式，退出app时提醒，鸿蒙跳转

router主要在entry修饰符之
router.getParams()

router.pushUrl({ url: 'pages/WebViewTestPage' })



router.pushUrl({url:''},router.RouterMode.Single)

    router.pushUrl({url:''},router.RouterMode.Standard)

提醒：

  aboutToAppear(): void {

    router.showAlertBeforeBackPage({
      message:'您确定要退出吗'
    })
  }