npm  install sortable

<template>
  <vxe-modal
    ref="modalRef"
    v-model="showModal"
    title="详情"
    width="70vw"
    height="60vh"
    class="his"
    transfer
  >
    <el-table ref="tableRef" :data="tableData" row-key="id">
      <el-table-column label="顺序号" width="100">
        <template slot-scope="scope">
          <span>{{ scope.$index + 1 }}</span>
        </template>
      </el-table-column>
      <el-table-column prop="name" label="姓名" />
      <el-table-column prop="address" label="地址" />
      <el-table-column prop="date" label="日期" />
      <!--      <el-table-column prop="num" label="顺序号" />-->
    </el-table>
  </vxe-modal>
</template>

<script>
import Sortable from 'sortablejs'
export default {
  data() {
    return {
      showModal: false,
      tableData: [
        {
          id: '1',
          date: '2024-05-01',
          name: '王小虎1',
          num: 1,
          address: '广州市白云区金沙江路 100'
        },
        {
          id: '2',
          date: '2024-05-02',
          name: '王小虎2',
          num: 2,
          address: '广州市白云区金沙江路 200'
        },
        {
          id: '3',
          date: '2024-05-03',
          name: '王小虎3',
          num: 3,
          address: '广州市白云区金沙江路 300'
        },
        {
          id: '4',
          date: '2024-05-04',
          name: '王小虎4',
          num: 4,
          address: '广州市白云区金沙江路 400'
        }
      ]
    }
  },
  methods: {
    openModal() {
      this.showModal = true
      this.$nextTick(() => {
        this.rowDrop()
      })
    },
    // 行拖拽
    rowDrop() {
      // 要侦听拖拽响应的DOM对象（数据存储在.el-table__body-wrapper > .el-table__row > tbody标签中（el-table的数据部分的“最外层”class名为el-table__body-wrapper））
      // const tbody = document.querySelector('.el-table__body-wrapper tbody')
      const tbody = this.$refs.tableRef.$el.querySelector('.el-table__body-wrapper tbody')
      const that = this
      Sortable.create(tbody, {
        // 结束拖拽后的回调函数
        onEnd({ newIndex, oldIndex }) {
          console.log('拖动了行，序号(index)"' + oldIndex + '"拖动到序号(index)"' + newIndex + '"')
          const currentRow = that.tableData.splice(oldIndex, 1)[0] // 将oldIndex位置的数据删除并取出，oldIndex后面位置的数据会依次前移一位
          that.tableData.splice(newIndex, 0, currentRow) // 将被删除元素插入到新位置（currRow表示上面的被删除数据）
        }
      })
    }
  }
}
</script>