效果

1. 使用插件vue-scrollto

//安装
yarn add vue-scrollto

2. 配置（在main.js中配置）

var VueScrollTo = require('vue-scrollto');
let app = createApp(App)
app.use(VueScrollTo,{
    container: ".content",
    duration: 500,
    easing: "ease",
    offset: 0,
    force: true,
    cancelable: true,
    onStart: false,
    onDone: false,
    onCancel: false,
    x: false,
    y: true
}).mount('#app')

3. 使用

<template>
  <van-nav-bar title="测试页面" fixed placeholder safe-area-inset-top></van-nav-bar>
  <div class="navbar">
    <div
      class="item"
      v-scroll-to="'#data'"
      :class="active == 0 ? 'active' : ''"
      @click="tapNav(0)"
    >
      <van-icon class-prefix="yzl-icon" name="shenpi1" />
      <span>审批内容</span>
    </div>
    <div
      class="item"
      v-scroll-to="'#flow'"
      :class="active == 1 ? 'active' : ''"
      @click="tapNav(1)"
    >
      <van-icon class-prefix="yzl-icon" name="shenpi" />
      <span>流程状态</span>
    </div>
  </div>

  <div class="content" @scroll="handleScroll">
    <div id="data">
      <div class="list" v-for="item in 20" :key="item">
        <div class="item">
          <span>{{ item }}今天天气很好</span>
        </div>
      </div>
    </div>
    <div id="flow">
      <div v-for="item in 40" :key="item">
        <span>{{ item }}流程</span>
      </div>
    </div>
  </div>
</template>

<script>
import { NavBar, Icon } from "vant";

export default {
  components: {
    [NavBar.name]: NavBar,
    [Icon.name]: Icon,
  },
  setup() {
    return {};
  },
  data() {
    return {
      active: 0,
    };
  },

  methods: {
    handleScroll(e) {
      let dataHeight = e.target.children[0].scrollHeight; //审批内容高度
      let flowHeight = e.target.children[1].scrollHeight; //流程状态高度
      let scrollTop = e.target.scrollTop; //滚动高度
      let clientHeight = e.target.clientHeight; //可见高度

      if (flowHeight > clientHeight) {
        //流程状态大于页面
        if (dataHeight > scrollTop) {
          this.active = 0;
        } else {
          this.active = 1;
        }
      } else {
        if (dataHeight - clientHeight > scrollTop) {
          this.active = 0;
        } else {
          this.active = 1;
        }
      }
    },
    tapNav(index) {
      this.active = index;
    },
  },
};
</script>

<style lang="scss" scoped>
.content {
  position: fixed;
  top: 90px;
  bottom: 0;
  left: 0;
  right: 0;
  overflow: auto;
  font-size: 14px;
  #data {
    padding: 0 20px;
    .list {
      padding: 20px;
    }
  }
  #flow {
    padding: 0 20px;
  }
}
.navbar {
  position: fixed;
  height: 44px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;

  background: #fff;
  color: #909399;

  .item {
    width: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}

.active {
  color: #409eff;
}
</style>