uniappで擬似スクロール機能を実装する方法

<template>
  <view class="container" :style="'height:' + containerHeight + 'px'">
    <scroll-view class="content" :style="'height:' + contentHeight + 'px'" scroll-y @scroll="onScroll">
      <view class="item" v-for="item in items" :key="item.id">{{ item.text }}</view>
    </scroll-view>
    <view class="scrollbar" :style="{height: scrollbarHeight + 'px', transform: 'translateY(' + scrollbarTop + 'px)'}"></view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      containerHeight: 400,
      contentHeight: 800,
      scrollbarHeight: 100,
      scrollbarTop: 0,
      items: [
        { id: 1, text: 'Item 1' },
        { id: 2, text: 'Item 2' },
        { id: 3, text: 'Item 3' },
        // ...
      ]
    }
  },
  methods: {
    onScroll(event) {
      const { scrollTop } = event.detail
      const contentHeight = this.contentHeight
      const containerHeight = this.containerHeight
      const scrollbarHeight = this.scrollbarHeight

      // 计算滚动条高度和位置
      const maxScrollTop = contentHeight - containerHeight
      const maxScrollbarTop = containerHeight - scrollbarHeight
      const scrollbarTop = scrollTop * maxScrollbarTop / maxScrollTop

      // 更新滚动条高度和位置
      this.scrollbarTop = scrollbarTop
    }
  }
}
</script>

<style>
.container {
  position: relative;
  overflow: hidden;
}

.content {
  overflow: hidden;
}

.item {
  height: 100px;
  line-height: 100px;
  text-align: center;
  border-bottom:1px solid #ccc;
}

.scrollbar {
  position: absolute;
  right: 0;
  width: 6px;
  background-color: rgba(0, 0, 0, 0.5);
}
</style>