HarmonyOS 鸿蒙Next Scroller.scrollToIndex()，这个方法无效

代码如下：

@Entry
@Component
struct Index{
private scrollerForList:Scroller = new Scroller()
private testData:string[]=[]
aboutToAppear(): void {
for (let i=0;i<100;i++){
this.testData.push(这是第${i}条数据)
}
}
build() {
Column(){
Text(“点我跳到第50条”)
.padding(10)
.onClick(()=>{
this.scrollerForList.scrollToIndex(49)
})
Scroll(this.scrollerForList){
List(){
ForEach(this.testData,(d:string)=>{
ListItem(){
Column(){
Text(d)
.fontColor("#000000")
.fontSize(18)
.fontWeight(FontWeight.Bold)
}
.margin({
top:10
})
.alignItems(HorizontalAlign.Start)
}
})
}
.padding({
left:16,right:16
})
}
.align(Alignment.Top)
.layoutWeight(1)
.width(“100%”)
}
.height(“100%”)
}
}