antd-vue ： 修改a-select下拉框的滚动条样式

通过给 a-select 标签设置 dropdown-class-name 属性，添加一个 class 类，然后修改这个类的样式

<a-select
    v-model="countName"
    default-value="xx市"
    style="width: 80px"
    dropdown-class-name="eia-dropdown-class"
>
    <a-select-option v-for="item in countNameArr" :key="item.key" :value="item">{{ item }}</a-select-option>
</a-select>

<style lang="scss"> // 这里一定不能加scoped!! 否则不生效
  .eia-dropdown-class {
    .ant-select-dropdown-menu-item {
      font-size: 13px;
      padding: 2px 6px;
    }
    .ant-select-dropdown-menu{
      &::-webkit-scrollbar {
        width: 8px;
        height: 2px;
        background: #dee4e9;
        border-radius: 6px; /*外层轨道*/
      }
      &::-webkit-scrollbar-thumb {
        display: block;
        width: 8px;
        margin: 0 auto;
        border-radius: 6px;
        background: rgba(54, 138, 241, 0.5); /*内层轨道*/
      }
    }
  }
</style>