el-tree 懒加载自动展开一级

loadGroupOrgId(node, resolve) {
      const { level } = node

      this.$get(`/emergency/bizGroupOrg/list`).then(({ data }) => {
        if (level === 0) {
          setTimeout(() => {
            node.childNodes[0].expanded = true
            node.childNodes[0].loadData()
          }, 100)
        }

        return resolve(data)
      })
    },