1、首先安装vant

npm i vant

2、app.vue中的内容如下：

<template>
  <van-tabs v-model:active="active" @click-tab="indexChange" >
    <van-tab v-for="index in totalData.length" :title="'标签 ' + index">
      <div class="contain">
        <van-list
            v-model:loading="loading"
            :finished="finished"
            finished-text="没有更多了"
            @load="onLoad"
        >
          <van-cell v-for="item in totalData[index-1]['标签']" :key="item" :title="item" />
        </van-list>
      </div>
    </van-tab>
  </van-tabs>

</template>
<script setup>
import {reactive, ref} from "vue";
const active = ref(0);
const totalData = reactive([
  {'标签':['1','2','3','4']},
  {'标签':['a','b','c','d']},
  {'标签':[]},
  {'标签':[]},
  {'标签':[]},
  {'标签':[]},
  {'标签':[]},
  {'标签':[]},
])
const loading = ref(false);
const finished = ref(false);
const indexChange = () => {
  if (totalData[active.value]['标签'].length >= 40) {
    finished.value = true;
  }else {
    finished.value = false;
  }
}
const onLoad = () => {
  // 异步更新数据
  // setTimeout 仅做示例，真实场景中一般为 ajax 请求
  if (active.value === 0){
    console.log('active.value0',active.value)
    setTimeout(() => {
      for (let i = 0; i < 10; i++) {
        totalData[active.value]['标签'].push(totalData[active.value]['标签'].length + 1);
      }

      // 加载状态结束
      loading.value = false;
        // 数据全部加载完成
      if (totalData[active.value]['标签'].length >= 40) {
        finished.value = true;
      }
    }, 1000);
  }
  else if (active.value === 1){
    console.log('active.value1', active.value);
    // 注意标签之间切换的太快了即使不是active.value===1的也会走到这里，这个是个小问题
    setTimeout(() => {
      for (let i = 0; i < 10; i++) {
        totalData[active.value]['标签'].push(totalData[active.value]['标签'].length + 1);
      }
      // 加载状态结束
      loading.value = false;
      // 数据全部加载完成
      if (totalData[active.value]['标签'].length >= 40) {
        finished.value = true;
      }
    }, 1000);
  }else {
    console.log(totalData[active.value]['标签'])
    console.log(totalData)
    loading.value = false;
    finished.value = true;
  }
};
</script>

<style scoped lang="less">
// 最重要的其实就是这个固定定位
.contain{
  position: fixed;
  top: 100px;  // 模拟场景是将上边的不动
  left: 0;
  right: 0px;
  bottom: 100px;  // 模拟场景是下边还有内容
  background-color: pink;
  overflow-y: scroll;
}
</style>

最终效果如下：

把标签一滑动到4

把标签2滑动到c，再次切换到标签1发现还是在4的位置，这就很好