@frontend_worker/search-selector/src/styles/mixins/clearfix.less

《远程搜索+单选》组件区别于element-ui或iview组件库的select远程搜索， ①将头部显示的值和下拉选项显示的值独立开来， ②避免远程加载时头部默认值显示异常， ③支持插槽自定义 ④将搜索框值放置于下拉弹框里面

.clearfix() {
    zoom: 1;
    &:before,
    &:after {
        content: "";
        display: table;
    }
    &:after {
        clear: both;
        visibility: hidden;
        font-size: 0;
        height: 0;
    }
}