Antdesign a-select 下拉框超出长度换行显示

       <a-form-model-item label="检查诊室：" style="width: 230px !important;">
          <div ref="selectBox" class="selectdrop">
          <a-select v-model="stuRoomId" :getPopupContainer="()=>this.$refs.selectBox" style="width: 140px;" @change="handleChangeRoom">
            <a-select-option v-for="item in localStuRoomList" :key="item.roomId">{
   {item.roomName}}</a-select-option>
          </a-select>
          </div>
        </a-form-model-item>

::v-deep .selectdrop .ant-select-dropdown-menu .ant-select-dropdown-menu-item{
  white-space: normal;
  word-break: break-all;
}