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主要加入draggable拖拽属性和drop事件，支持拖拽

<a-tree 
  v-model="checkedKeys4"
  checkStrictly
  :showLine="true"
  checkable
  @check="onCheckChange"
  :tree-data="treeData"
  draggable
  @drop="onDrop"
>
</a-tree>

具体drop事件代码实现如下

onDrop(info){
    const dropPos = info.node.pos.split('-');
    const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);
    const dropKey = info.node.dataRef.key;
    const dragKey = info.dragNode.dataRef.key;
    
    const loop = (data, key, callback) => {
        data.forEach((item, index) => {
        if (item.key === key) {
            return callback(item, index, data);
        }

        if (item.children) {
            return loop(item.children, key, callback);
        }
        });
    };

    const data = [...this.treeData]; // Find dragObject

    let dragObj;
    loop(data, dragKey, (item, index, arr) => {
        arr.splice(index, 1);
        dragObj = item;
    });

    if (!info.dropToGap) {
        // Drop on the content
        loop(data, dropKey, item => {
        item.children = item.children || []; /// where to insert 示例添加到头部，可以是随意位置

        item.children.unshift(dragObj);
        });
    } else if ((info.node.children || []).length > 0 && // Has children
    info.node.expanded && // Is expanded
    dropPosition === 1 // On the bottom gap
    ) {
        loop(data, dropKey, item => {
        item.children = item.children || []; // where to insert 示例添加到头部，可以是随意位置

        item.children.unshift(dragObj);
        });
    } else {
        let ar = [];
        let i = 0;
        loop(data, dropKey, (_item, index, arr) => {
        ar = arr;
        i = index;
        });

        if (dropPosition === -1) {
        ar.splice(i, 0, dragObj);
        } else {
        ar.splice(i + 1, 0, dragObj);
        }
    }
    this.treeData=data
},