官方文档：https://www.vue-treeselect.cn/
导入引用：

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

注冊:components: { Treeselect },
html代码：

<el-form-item label="货区&架&位" prop="gid">
  <treeselect
          :options="gridArr"
          :value="form.gid"
          :normalizer="normalizer"
          @select="onClickGid"
          placeholder="请选择货区&位&架"
          noOptionsText="暂无数据"
          style="width: 270px;"
  />
</el-form-item>

js代码：

data() {
    return {
    	normalizer(node){
	        //去掉children=[]的children属性 respectively
	        if(node.children && !node.children.length){
	          delete node.children;
	        }
	      }
    }
}
methods: {
	 onClickGid(node,i) {
      this.form.gid = node.id
    }
}