@frontend_worker/search-selector/src/styles/mixins/loading.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

// Loading for loop
.zz-load-loop{
    animation: ani-load-loop 1s linear infinite;
}

@keyframes ani-load-loop {
    from { transform: rotate(0deg);}
    50%  { transform: rotate(180deg);}
    to   { transform: rotate(360deg);}
}