HarmonyOS listitem有直接返回index的方法吗？

@Entry  
@Component  
struct ListItemExample {  
  scroll: ListScroller = new ListScroller()  
  listIndex: number = 0  
  targetObj: Record<string, number> = {}  
  articleDetail: ESObject = {  
    header: 'header1',  
    content1: 'cont1',  
    content2: '',  
    content3: 'cont3',  
    footer: 'footer1'  
  }  
  @Builder  
  TextBuild(name: string) {  
    Text('' + name)  
      .width('100%')  
      .height(400)  
      .fontSize(16)  
      .textAlign(TextAlign.Center)  
      .borderRadius(10)  
      .backgroundColor(0xFFFFFF)  
  }  
  getTargetIndex(index: number): boolean {  
    this.targetObj[index] = this.listIndex  
    this.listIndex++  
    return true  
  }  
  build() {  
    Stack({ alignContent: Alignment.Bottom }) {  
      List({ space: 20, initialIndex: 0, scroller: this.scroll }) {  
        if (this.articleDetail.header && this.getTargetIndex(0)) {  
          ListItem() {  
            this.TextBuild(this.articleDetail.header)  
          }  
        }  
        if (this.articleDetail.content1 && this.getTargetIndex(1)) {  
          ListItem() {  
            this.TextBuild(this.articleDetail.content1)  
          }  
        }  
        if (this.articleDetail.content2 && this.getTargetIndex(2)) {  
          ListItem() {  
            this.TextBuild(this.articleDetail.content2)  
          }  
        }  
        if (this.articleDetail.content3 && this.getTargetIndex(3)) {  
          ListItem() {  
            this.TextBuild(this.articleDetail.content3)  
          }  
        }  
        if (this.articleDetail.footer && this.getTargetIndex(4)) {  
          ListItem() {  
            this.TextBuild(this.articleDetail.footer)  
          }  
        }  
      }.width('90%')  
      .height('100%')  
      .scrollBar(BarState.Off)  
      Button('click').onClick(() => {  
        console.log('targetObj' + JSON.stringify(this.targetObj), this.targetObj[3])  
        this.scroll.scrollToIndex(this.targetObj[3], true)  
      })  
    }.width('100%').height('100%').backgroundColor(0xDCDCDC).padding({ top: 5 })  
  }  
}