el-tree中实现拖拽时弹框确定是否成功

<el-tree
  :data="data"
   node-key="id"
   default-expand-all
   @node-drag-start="handleDragStart"
   @node-drop="handleDrop"
   draggable
   :props="{label:'name',children:'children'}"
 ></el-tree>

拖拽开始时克隆数据

 handleDragStart() {
    this.copyTreeList = JSON.parse(
      JSON.stringify(this.data)
    );
  },

拖拽完成显示弹框

    handleDrop(draggingNode, dropNode, dropType, ev) {
      this.$confirm(
        `是否将节点移动到${dropNode.label}${
          dropType == "before" ? "之前" : dropType == "after" ? "之后" : "下"
        }?`,
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      )
        .then(() => {
       	 // 成功之后调用接口
         //  this.getTreeList(this.data, "");
          this.$message({
            type: "success",
            message: "移动成功!"
          });
        })
        .catch(() => {
          this.data= this.copyTreeList;
          this.$message({
            type: "info",
            message: "取消移动"
          });
        });
    },