vue Treeselect下拉树只能选择第N级元素实现代码

<treeselect 
  :disable-branch-nodes="true"
  :normalizer="normalizer" 
  v-model="formData.goodsTypeId" 
  :multiple="false" 
  :options="goodsType" 
  placeholder='请选择'>
  <label slot="option-label" slot-scope="{ node, shouldShowCount, count, labelClassName, 
   countClassName }">
     {{ node.label }}
  </label>
</treeselect>

normalizer(node) {
  //去掉children=[]的children属性
  if(node.children && !node.children.length) {
   delete node.children;
  }
  if(node.isLeaf=='Y' && node.typeLevel!=3){
   node['isDisabled'] = true;
  }
  return {
   id: node.typeId,
   label: node.typeName,
   children: node.children,
  }       
},

/deep/ .el-tree-node{
   .is-leaf + .el-checkbox .el-checkbox__inner{
     display: inline-block;
   }
   .el-checkbox .el-checkbox__inner{
     display: none;
   }
 }