HarmonyOS zIndex能否通过状态变量来更新

可以参考如下demo实现zIndex更新，并且已确认Image不会重刷，会在页面渲染完成时触发图片解码上屏操作：

@Entry
@Component
struct TestZIndex {
  @State message: string = 'Hello World';
  @State zIndex1: number = 2
  @State zIndex2: number = 0
  @State mediaSource: Resource = $r('app.media.img_test1')

  build() {
    Column() {
      Button('change')
        .onClick(() => {
          let temp = this.zIndex2
          this.zIndex2 = this.zIndex1
          this.zIndex1 = temp
        })
      Stack() {
        myComp1()
          .width(50)
          .height(50)
          .zIndex(this.zIndex1)
        myComp2()
          .width(50)
          .height(50)
          .zIndex(this.zIndex2)
      }
    }
    .height('100%')
    .width('100%')
  }
}

@Component
struct myComp1 {
  build() {
    Column() {
      Text('my comp 1')
        .width('100%')
        .height(200)
        .backgroundColor(Color.Red)
      Image($r('app.media.app_icon'))
        .width('100%')
        .height(300)
        .backgroundColor(Color.Red)
        .onComplete(() => {
          console.log('comp1 complete')
        })
    }
  }
}

@Component
struct myComp2 {
  build() {
    Column() {
      Text('my comp 2')
        .width('100%')
        .height(200)
        .backgroundColor(Color.White)
      Image($r('app.media.img'))
        .width('100%')
        .height(300)
        .backgroundColor(Color.White)
        .onComplete(() => {
          console.log('comp2 complete')
        })
    }
  }
}
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