<el-table v-if="refreshTable" v-loading="loading" :data="classifyList" row-key="classifyId" :default-expand-all="isExpandAll" :tree-props="{children: 'children', hasChildren: 'hasChildren'}" > <el-table-column label="资源分类名称" prop="classifyName" /> <el-table-column label="操作" align="center" class-name="small-padding fixed-width"> <template slot-scope="scope"> <el-button size="mini" type="text" icon="el-icon-edit" @click="handleUpdate(scope.row)" v-hasPermi="['esb:classify:edit']" >修改</el-button> <el-button size="mini" type="text" icon="el-icon-plus" @click="handleAdd(scope.row)" v-hasPermi="['esb:classify:add']" >新增</el-button> <el-button size="mini" type="text" icon="el-icon-delete" @click="handleDelete(scope.row)" v-hasPermi="['esb:classify:remove']" >删除</el-button> </template> </el-table-column> </el-table>实现树形拖拽以及后台树形数据的存储

实现树形拖拽和后台树形数据的存储需要进行以下步骤：

1.在表格上添加一个拖拽事件 `@node-drag-start="handleDragStart" @node-drag-over="handleDragOver" @node-drag-enter="handleDragEnter" @node-drag-leave="handleDragLeave" @node-drag-end="handleDragEnd" @node-drop="handleDrop"`。

2.实现拖拽事件的方法，具体实现方式可以参考 Element UI 的文档。在 `handleDrop` 方法中，可以获取到拖拽的节点和目标节点，然后将拖拽的节点移动到目标节点的子节点中。

3.在后台存储树形数据时，可以使用递归的方式将树形数据转换成一个数组，然后将数组存储到数据库中。在获取树形数据时，可以将数组转换成树形数据。

下面是一个简单的代码示例，仅供参考：

<template>
  <el-table
    :data="treeData"
    :tree-props="treeProps"
    row-key="id"
    @node-drag-start="handleDragStart"
    @node-drag-over="handleDragOver"
    @node-drag-enter="handleDragEnter"
    @node-drag-leave="handleDragLeave"
    @node-drag-end="handleDragEnd"
    @node-drop="handleDrop"
  >
    <el-table-column prop="name" label="名称"></el-table-column>
  </el-table>
</template>

<script>
export default {
  data() {
    return {
      treeData: [
        {
          id: 1,
          name: "节点1",
          children: [
            {
              id: 2,
              name: "节点2",
            },
          ],
        },
        {
          id: 3,
          name: "节点3",
        },
      ],
      treeProps: {
        children: "children",
        hasChildren: (data) => data.children && data.children.length > 0,
      },
    };
  },
  methods: {
    handleDragStart(draggingNode) {
      console.log("handleDragStart", draggingNode);
    },
    handleDragOver(draggingNode, dropNode) {
      console.log("handleDragOver", draggingNode, dropNode);
    },
    handleDragEnter(draggingNode, dropNode) {
      console.log("handleDragEnter", draggingNode, dropNode);
    },
    handleDragLeave(draggingNode, dropNode) {
      console.log("handleDragLeave", draggingNode, dropNode);
    },
    handleDragEnd(draggingNode) {
      console.log("handleDragEnd", draggingNode);
    },
    handleDrop(draggingNode, dropNode, dropType) {
      console.log("handleDrop", draggingNode, dropNode, dropType);
      if (dropType === "inner") {
        draggingNode.parent.children.splice(draggingNode.parent.children.indexOf(draggingNode), 1);
        dropNode.children.push(draggingNode);
        draggingNode.parent = dropNode;
      } else {
        const index = dropNode.parent.children.indexOf(dropNode);
        draggingNode.parent.children.splice(draggingNode.parent.children.indexOf(draggingNode), 1);
        dropNode.parent.children.splice(index + (dropType === "before" ? 0 : 1), 0, draggingNode);
        draggingNode.parent = dropNode.parent;
      }
    },
  },
};
</script>