使用better-scroll插件为什么会出现回退到初始位置

Question

问题遇到的现象和发生背景

左右联动使用better-scroll后会回退到起始位置
this.scroll.scrollTo(0,-this.allHeight[index],300);写法没问题为什么还会回退到初始位置

问题相关代码，请勿粘贴截图

```javascript
 <!-- 右侧内容部分 -->
      <div class="ultwo"  ref="right">
        <ul  @scroll="scrollClick($event)" >
          <li v-for="(i, ind) in img" :key="ind" class="li">
            <div
              class="ultwodiv"
              v-for="(item, index) in i.app_category_items"
              :key="index"
            >
              <van-image
                width="100%"
                height="80"
                :src="item.cover"
                class="vanimg"
              />
              <p>{{ item.name }}</p>
            </div>
          </li>
        </ul>
      </div>
    

```javascript
onChange(index) {
      // let ul = document.querySelector('ul')
      let uls = this.scroll.content.childNodes;
      console.log(uls);
      let height = 0;
      this.allHeight.push(height);
      uls.forEach((v) => {
        height += v.scrollHeight;
        //  console.log(v.clientHeight);
        this.allHeight.push(height);
        console.log(height);
      });
      console.log();
      this.scroll.scrollTo(0,-this.allHeight[index],300);
    },

```javascript
 mounted() {
    if (!this.scroll) {
          this.$nextTick(() => {
      this.scroll = new b(this.$refs.right, {
        click: true,
      });
      console.log(this.scroll);
    });
    }else{
      this.scroll.refresh()
    }

运行结果及报错内容

我的解答思路和尝试过的方法

我想要达到的结果

Answer 1

this.scroll.scrollTo(0,-this.allHeight[index],300);这句延时执行试试，还有onChange怎么调用的？better-scroll什么版本的

setTimeout(()=>{
this.scroll.scrollTo(0,-this.allHeight[index],300);
},200);