@frontend_worker/search-selector/src/styles/animation/fade.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

.fade-motion(@className, @keyframeName) {
    .make-motion(@className, @keyframeName, @animation-time-quick);
    .@{className}-enter-active, .@{className}-appear {
        opacity: 0;
        animation-timing-function: linear;
    }
    .@{className}-leave-active {
        animation-timing-function: linear;
    }
}

.fade-motion(fade, ivuFade);

@keyframes ivuFadeIn {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes ivuFadeOut {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}