Ant Design Vue中a-select组件下拉列表在局部滚动时不跟随问题解决方法

问题如下：

修改方法如下

<a-tree-select:getPopupContainer="triggerNode => {return triggerNode.parentNode || document.body;}"style="width: 100%":dropdownStyle="{ maxHeight: '400px', overflow: 'auto' }":treeData="treeData"placeholder="请选择行使主体!"treeDefaultExpandAllv-decorator="['deptCode',{ rules: [{ required: true, message: '请选择行使主体!' }] },]">