How does el-table achieve automatic scrolling effect

Requirements: The table scrolls up automatically, and there must be a pause effect.

The renderings are as follows:

 Implementation process: Get the real DOM after the current table is mounted, and get the div element that carries the data in the table. After getting the element, increase the distance from the top of the element at regular intervals to achieve the scrolling effect.

The specific code is as follows:

<template>
  <div class="">
    <el-table :data="tableData" ref="table" height="300px" style="width: 100%">
      <el-table-column prop="date" label="日期" width="180" />
      <el-table-column prop="name" label="姓名" width="180" />
      <el-table-column prop="address" label="地址" />
    </el-table>
  </div>
</template>
<script>
export default {
  data() {
    return {
      tableData: [
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1519 弄",
        },
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1516 弄",
        },
      ],
    };
  },
  mounted() {
    this.infinitScroll();
  },
  methods: {
    infinitScroll() {
      // 拿到表格挂载后的真实DOM
      const table = this.$refs.table;
      // 拿到表格中承载数据的div元素
      const divData = table.bodyWrapper;
      divData.onmouseover = function () {
        clearInterval(t);
      }; //鼠标移入，停止滚动
      divData.onmouseout = function () {
        start();
      }; //鼠标移出，继续滚动

      // 拿到元素后，对元素进行定时增加距离顶部距离，实现滚动效果(此配置为每1秒移动20像素)
      let t;
      function start() {
        // 数据少于表格高度停止滚动
        if (divData.clientHeight >= divData.scrollHeight) {
          return;
        }
        t = setInterval(() => {
          // 元素自增距离顶部1像素
          divData.scrollTop += 20;
          // 判断元素是否滚动到底部(可视高度+距离顶部=整个高度)
          if (
            divData.clientHeight + divData.scrollTop ==
            divData.scrollHeight
          ) {
            // 重置table距离顶部距离
            divData.scrollTop = 0;
          }
        }, 1000);
      }
      start();
    },
  },
};
</script>