table表格表头拖拽呼唤位置

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<template>   <div class="">     <table>       <thead class="el-table__header-wrapper has-gutter">         <tr>           <th v-for="(columns,index) in tablesColumns"               :key="index"               draggable="true"               @dragstart="dragstartEvent(index)"               @dragenter="dragenterEvent($event,columns)"               @dragend="dragendEvent($event,columns)"           >             <label class="cell">{{ columns.name }}</label>           </th>         </tr>       </thead>       <tbody class="el-table__body">         <tr>           <td />         </tr>       </tbody>     </table>   </div> </template>   <script> export default {   data() {     return {       tablesColumns: [{           id: 0,           name: '债券代码'         }, {           id: 1,           name: '买卖方向'         }, {           id: 2,           name: '量(万元)'         }, {           id: 3,           name: '收益率'         }]       }   },   created() {},   methods: {     // 拖动开始--- 拿到当前目标对象的索引       dragstartEvent(index) {       this.dragStartIndex = index     },     // 拖动过程 --- 拿到结束后的对象       dragenterEvent(ev, col) {       this.dragEndColumn = col     },       // 拖动结束       dragendEvent(ev, col) {       this.tablesColumns.splice(this.dragEndColumn.id, 1, ...this.tablesColumns.splice(this.dragStartIndex, 1, this.tablesColumns[this.dragEndColumn.id])) // 这里用到了 数组对象的交换，id其实就是 索引下标         for (let i = 0; i < this.tablesColumns.length; i++) { // 重新把id 整理一遍         this.tablesColumns[i].id = i       }     }     } } </script> <style scoped lang='less'> </style>