HarmonyOS 是否有navigation示例

示例参考如下：

@Entry
@Component
struct Index {
  @Provide('pageInfos') pageInfos: NavPathStack = new NavPathStack()
  isLogin: boolean = false;
  @State fontColor: string = '#182431'
  @State selectedFontColor: string = '#007DFF'
  @State currentIndex: number = 0
  private controller: TabsController = new TabsController()

  @Builder
  PagesMap(name: string) {
    if (name == 'Login') {
      Login()
    }
  }

  @Builder
  tabBuilder(index: number, name: string) {
    Column() {
      Text(name)
        .fontColor(this.currentIndex === index ? this.selectedFontColor : this.fontColor)
        .fontSize(16)
        .fontWeight(this.currentIndex === index ? 500 : 400)
        .lineHeight(22)
        .margin({ top: 17, bottom: 7 })
      Divider().strokeWidth(2).color('#007DFF').opacity(this.currentIndex === index ? 1 : 0)
    }.width('100%')
  }

  build() {
    Navigation(this.pageInfos) {
      Button('登录模块').width('80%').margin(2).onClick(() => {
        this.pageInfos.pushPathByName('Login', '');
      })
      NavRouter() {
        Button('页1').width('80%').margin(2)
        NavDestination() {
          Text("页1")
        }
      }

      NavRouter() {
        Button('页2').width('80%').margin(2)
        NavDestination() {
          Text("页2")
        }
      }

      NavRouter() {
        Button('页3').width('80%').margin(2)
        NavDestination() {
          Text("页3")
        }
      }

      Tabs({ barPosition: BarPosition.Start, index: this.currentIndex, controller: this.controller }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#00CB87')
        }.tabBar(this.tabBuilder(0, 'green'))

        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#007DFF')
        }.tabBar(this.tabBuilder(1, 'blue'))

        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#FFBF00')
        }.tabBar(this.tabBuilder(2, 'yellow'))

        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#E67C92')
        }.tabBar(this.tabBuilder(3, 'pink'))
      }
      .vertical(false)
      .barMode(BarMode.Fixed)
      .barWidth(360)
      .barHeight(56)
      .animationDuration(400)
      .onChange((index: number) => {
        this.currentIndex = index
      })
      .width(360)
      .height(296)
      .margin({ top: 52 })
      .backgroundColor('#F1F3F5')
    }.navDestination(this.PagesMap)
  }
}

@Component
struct Login {
  build() {
    NavDestination() {
      Navigation() {
        NavRouter() {
          Button('功能1').width('80%').margin(2)
          NavDestination() {
            Text("页1")
          }
        }

        NavRouter() {
          Button('功能2').width('80%').margin(2)
          NavDestination() {
            Text("页2")
          }
        }

        NavRouter() {
          Button('功能3').width('80%').margin(2)
          NavDestination() {
            Text("页3")
          }
        }
      }
    }
  }
}
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参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-basic-components-navigation-V5