轮播图指示器一点一点加载动效
示例效果如下所示
<template>
<div class="lunbo-point-tab">
<el-carousel :interval="6000" type="card" height="200px">
<el-carousel-item v-for="item in 6" :key="item">
<h3 class="medium">{{ item }}</h3>
</el-carousel-item>
</el-carousel>
</div>
</template>
<script>
</script>
<style scoped>
.lunbo-point-tab {
text-align: center;
}
.lunbo-point-tab .el-carousel__item h3 {
color: #475669;
font-size: 14px;
opacity: 0.75;
line-height: 200px;
margin: 0;
}
.lunbo-point-tab .el-carousel__item:nth-child(2n) {
background-color: #42b983;
}
.lunbo-point-tab .el-carousel__item:nth-child(2n+1) {
background-color: #abcdef;
}
.lunbo-point-tab .el-carousel__indicator--horizontal.is-active::after {
content: "";
display: block;
width: 100%;
height: 2px;
background: red;
transform: scaleX(0);
animation: progress 6s linear 0s infinite;
transform-origin: left;
margin-top: -2px;
}
@keyframes progress {
0% {
transform: scaleX(0);
}
to {
transform: scaleX(1);
}
}
</style>
核心的css
代码,就是如下所示,主要结合伪类实现,css3
中的变换transform
以及动画关键帧来实现
.lunbo-point-tab .el-carousel__indicator--horizontal.is-active::after {
content: "";
display: block;
width: 100%;
height: 2px;
background: red;
transform: scaleX(0);
animation: progress 6s linear 0s infinite;
transform-origin: left; // 旋转变换的基点,从左边开始
margin-top: -2px;
}
@keyframes progress {
0% {
transform: scaleX(0);
}
to {
transform: scaleX(1);
}
}
轮播图指示器一点一点加载动效,主要结合给激活指示元素添加伪元素,并结合css3动画关键帧去实现,需要注意的是,需要给激活元素样式添加margin-top:-高度值,才会与原元素保持重合
旋转基点:通过transform-origin:left/center/right属性进行控制