Element Plus el-tree懒加载默认选中

const loadNode = async (node: Node, resolve: (data: AreaType[]) => void) => {
  if (node.level === 0) {
    const {data} = await getRegionList(areaOptions)
    if (!props.special) {
      for (let i = 0; i < 4; i++) {
        data[i].isLeaf = true;
      }
      emit('checkNode', data[0].id, data);
      await nextTick(() => {
        treeRef.value?.setCurrentKey(data[0].id);
        return resolve(data);
      });
    } else {
      resolve(data) //先接收数据 重点，不然获取不到节点
      const node = treeRef.value?.getNode(data[0].id) //获取要展开的父节点，这边业务要求是展开第一个节点，我这边只有层级两层，层级更深的在node.level>=1中调整逻辑
      node?.expand() //调用节点的展开，会再次触发loadNode，相当于模拟了一次节点点击
      return
    }
  }
  if (node.level >= 1) {
    areaOptions.parentId = node.data.id;
    const {data} = await getRegionList(areaOptions)
    data.forEach(item => {
      item.isLeaf = true;
    });
    if(props.special){
      await nextTick(() => {
        treeRef.value?.setCurrentKey(data[0].id)
        emit('checkNode', data[0].id, data);
      })
    }
    return resolve(data);
  }
};