本文主要包含a-tree的操作，添加、修改、删除和拖拽。

<a-tree
                  showLine
                  showIcon
                  :multiple="multiple"
                  :draggable="draggable"
                  :default-expanded-keys="expandedKeys"
                  :expandedKeys="expandedKeys"
                  :selectedKeys="selectedKeys"
                  :treeData="treeData"
                  v-if="!spinning"
                  @drop="onDrag"
                  @expand="onExpand"
                  @select="onSelect"
                >
                  <template v-if="nodeBtns" slot="custom" slot-scope="item">
                    <a-button size="small" icon="plus" @click="toAdd(item)" />
                    <a-button size="small" icon="edit" @click="toEdit(item)" />
                    <a-button size="small" icon="delete" @click="toDelete(item)" />
                  </template>
              </a-tree>

数据：

const treeData = [
   {
     title: "1",
     key: "0-0",
     scopedSlots: { icon: "rootAdd" },
     children: [
      {
        title: "1.1",
        key: "0-1",
        id:"0-1",
        parentId:"",
        sort:0,
        scopedSlots: { icon: "custom" },
        children: [
          { title: "1.1.1", key: "0-1-1", id: "0-1-1", parentId:"0-1",sort:0, scopedSlots: { icon: "childEdit" } },
          { title: "1.1.2", key: "0-1-2", id: "0-1-2",  parentId:"0-1",sort:1, scopedSlots: { icon: "childEdit" } },
          { title: "1.1.3", key: "0-1-3", id: "0-1-3",  parentId:"0-1",sort:2, scopedSlots: { icon: "childEdit" } },
        ],
      },
    ],
  },
];

增改的操作操作：

    treeAction (node, id, fn) { // fn对应tree节点的操作
      node.some((item,index) => {
        if (item.key === id) {
          fn(node, item, index)
          return true;
        }
        if (item.children && item.children.length) {
          this.treeAction(item.children, id, fn);
        }
      });
    },

1.增加（在接口执行成功后执行，不用刷新整个tree）：

let that = this
that.treeAction(that.treeData, that.item.parentId, (node, item, index) => {
                    item.children = item.children || [];
                    that.item.key=data
                    that.item.scopedSlots = { icon: "custom" }
                    item.children.push(that.item)     
  });

2. 修改（在接口执行成功后执行,不用刷新整个tree）：

 this.treeAction(this.treeData, this.item.key, (node, item, index) => {
                  item.title = that.item.title;
 });

3. 删除（在接口执行成功后执行,不用刷新整个tree）：

 that.treeAction(that.treeData, item.key, (node, item, index) => {
                node.splice(index, 1);
 });