HarmonyOS 点击tabs如何跳转到二级页面

// xxx.ets  
import { router } from '@kit.ArkUI'  
@Entry  
@Component  
struct onePage {  
  @State fontColor: string = '#182431'  
  @State selectedFontColor: string = '#007DFF'  
  @State currentIndex: number = 0  
  private controller: TabsController = new TabsController()  
  tabTitle: string[] = ['健康', '商城', '预警中心', '消息', '我的']  
  @Builder  
  imgText(item: string, index: number) {  
    if (index === 2) {  
      Column() {  
        Column() {  
          Image($r('app.media.startIcon'))  
            .height(50)  
            .height(50)  
            .objectFit(ImageFit.Contain)  
            .borderRadius(100)  
        }  
        .height(60)  
        .width(60)  
        .offset({ y: -20 })  
        .backgroundColor(Color.White)  
        .borderRadius(100)  
        Text(item)  
          .fontSize(15)  
          .offset({ y: -10 })  
      }  
      .width('20%')  
      .height('100%')  
      .backgroundColor(Color.Blue)  
      .justifyContent(FlexAlign.Center)  
      .onClick(() => {  
        router.pushUrl({  
          url: 'pages/testPage'  
        })  
      })  
    }  
    else {  
      Column({ space: 10 }) {  
        Image($r('app.media.startIcon'))  
          .height(40)  
          .objectFit(ImageFit.Contain)  
        Text(item)  
          .fontSize(15)  
      }  
      .width('20%')  
      .height('100%')  
      .backgroundColor(Color.Blue)  
      .onClick(() => {  
        this.currentIndex = index  
        this.controller.changeIndex(this.currentIndex)  
      })  
    }  
  }  
  @Builder  
  bottomBuilder() {  
    Row() {  
      ForEach(this.tabTitle, (item: string, index: number) => {  
        this.imgText(item, index)  
      })  
    }  
    .justifyContent(FlexAlign.SpaceEvenly)  
    .width('100%')  
    .height('10%')  
  }  
  build() {  
    Column() {  
      Tabs({ index: this.currentIndex, controller: this.controller }) {  
        TabContent() {  
          Column().width('100%').height('100%').backgroundColor('#00CB87')  
        }  
        TabContent() {  
          Column().width('100%').height('100%').backgroundColor('#007DFF')  
        }      
        TabContent() {  
          Column().width('100%').height('100%').backgroundColor('#FFBF00')  
        }  
        TabContent() {  
          Column().width('100%').height('100%').backgroundColor('#cccccc')  
        }  
      }  
      .onChange((index: number) => {  
        this.currentIndex = index  
        if (this.currentIndex == 2) {  
          router.pushUrl({  
            url: 'pages/testPage'  
          })  
        }  
      })  
      .width('100%')  
      .height('90%')  
      this.bottomBuilder()  
    }  
    .width('100%')  
    .height('100%')  
  }  
}