嵌套滚动回滑，在一些常见的商品预览页，会出现嵌套滚动的场景

@Entry 
@Component 
struct StickyNestedScroll { 
  @State arr: number[] = [] 
  
  @Styles 
  listCard() { 
    .backgroundColor(Color.White) 
    .height(72) 
    .width("100%") 
    .borderRadius(12) 
  } 
  
  @State 
  textOffset: number = 0 
  scroller: Scroller = new Scroller() 
  @State 
  top: number = 200 
  
  build() { 
    Stack({ alignContent: Alignment.TopStart }) { 
      List({ scroller: this.scroller, space: 10 }) { 
        ForEach(this.arr, (item: number) => { 
          ListItem() { 
            Text("item" + item) 
              .fontSize(16) 
          }.listCard() 
        }, (item: string) => item) 
      }.width("100%") 
      .edgeEffect(EdgeEffect.Spring) 
      .margin({ 
        top: this.top 
      }).onScrollFrameBegin((offset: number, state: ScrollState) => { 
  
        if (this.textOffset - offset >= 0) { 
          this.textOffset = 0 
        } else { 
          this.textOffset = this.textOffset - offset 
        } 
        if ( this.textOffset < -200) { 
          this.textOffset = -200 
        } 
        if (this.top - offset >= 200) { 
          this.top = 200 
        } else { 
          if (this.top - offset <0) { 
            this.top = 0 
          } else { 
            this.top = this.top - offset 
          } 
        } 
        if (this.textOffset != -200 && this.textOffset != 0) { 
          return { 
            offsetRemain: 0 
          } 
        } 
        console.log("lizhouze", this.top) 
        return { 
          offsetRemain: offset 
        } 
      }) 
  
      Text("Scroll Area") 
        .width("100%") 
        .height(200) 
        .backgroundColor('#0080DC') 
        .offset({ 
          y: this.textOffset 
        }) 
  
    }.width("100%") 
  
  } 
  
  aboutToAppear() { 
    for (let i = 0; i < 30; i++) { 
      this.arr.push(i) 
    } 
  } 
}
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