vue el-upload 上传拖拽排序

<template>
   <!-- 省略其他配置 -->
   <el-upload ref="upload" :file-list.sync="fileList"></el-upload>
 </template>
 <script>
 import Sortable from 'sortablejs';
 export default {
   data() {
     return {
       fileList: []
     };
   },
   mounted() {
     this.initDragSort();
   },
   methods: {
     initDragSort() {
       // 支持拖拽排序
       const el = this.$refs.upload.$el.querySelectorAll('.el-upload-list')[0];
       Sortable.create(el, {
         onEnd: ({ oldIndex, newIndex }) => {
           // 交换位置
           const arr = this.fileList;
           const page = arr[oldIndex];
           arr.splice(oldIndex, 1);
           arr.splice(newIndex, 0, page);
         }
       });
     }
   }
 };
 </script>