HarmonyOS 鸿蒙Next ABCDE 5个TabContent，进入APP在A页面，点击D页面，会导致BC都实例化并请求数据

可以尝试懒加载，切换到目标TabContent时，才进行接口请求

[@Entry](/user/Entry)
[@Component](/user/Component)
struct demo {
  [@State](/user/State) currentIndex: number = 0
  [@State](/user/State) tabContentArr: boolean[] = [true, false, false, false]
  tabContents: string[] = ["首页", "推荐", "发现", "我的"]
  build() {
    Row() {
      Column() {
        Tabs({ barPosition: BarPosition.End }) {
          ForEach(this.tabContents, (item, index) => {
            TabContent() {
              if (this.currentIndex === index || this.tabContentArr[index]) {
                TabChild({ index: this.currentIndex })//懒加载接口可以放在子组件页面中
              }
            }.tabBar(item)
          })
        }
        .onChange((index) => {
          this.currentIndex = index
          this.tabContentArr[index] = true
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}