HarmonyOS 扫码时多个二维码扫码结果上的箭头动画怎么实现

参考：

@Entry
@Component
struct ytt {

  @State btnWidth:number|string =60;
  @State btnHeight:number|string=60;

  build() {

    Button('点我')
      .fontColor(Color.Black)
      .width(this.btnWidth)
      .height(this.btnHeight)
      .onClick((event: ClickEvent) => {

        setInterval(() => {
          animateTo({
            duration: 400,
            tempo: 1,
            curve: Curve.Linear,
            iterations: 4,
            playMode: PlayMode.Alternate,
            onFinish: () => {
              this.btnWidth = '60';
              this.btnHeight = '60';
            }
          }, () => {
            this.btnWidth = '30';
            this.btnHeight = '30';
          })
        }, 1300)

      })
      .width(this.btnWidth)
      .height(this.btnHeight)
  }
}