element的select选择器结合Tree树形

https://vue-treeselect.js.org/#basic-features

https://blog.csdn.net/w_quan/article/details/105711669

https://blog.csdn.net/webshao/article/details/104517683

首先安装

npm install @riophae/vue-treeselect --save
然后在页面中引入

import Treeselect from '@riophae/vue-treeselect'
import '@riophae/vue-treeselect/dist/vue-treeselect.css'