跑马灯的两种实现方式

方式一：利用元素尺寸变化监听api，计算宽度，得出时间，进行无限次数动画。

优点：能自定义速度（0 - 1）。

<template><div class="box"><i class="iconfont icon-gonggao"></i><div class="marquee-box"><div ref="elRef" class="marquee"><slot></slot></div></div></div>
</template>
<script setup lang="ts">
import { onMounted, ref } from 'vue';
const props = defineProps({speed: {type: Number,default: 0.1},
})
const elRef = ref()onMounted(() => {marquee(elRef.value, props.speed)
})function marquee(el: HTMLElement, speed: number = 0.1) {const startMarquee = () => {const parentWidth = parseInt(window.getComputedStyle(el?.parentNode).width)const allWidth = window.innerWidth + parseInt(window.getComputedStyle(el).width)const _speed = speed >= 1 ? 0.99 : speed <= 0 ? 0.01 : speed;const time = allWidth * 30000 / 1920 * (1 - _speed);el.animate([{ transform: `translateX(${parentWidth}px)` },{ transform: `translateX(-100%)`}], {duration: time,easing: 'linear',iterations: Infinity,})}const ro= new ResizeObserver((entries, observer) => {startMarquee()});ro.observe(el);
}
</script>
<style lang="less" scoped>.box{display: flex;align-items: center;padding: 1.875rem 0 1.875rem 1rem;background-color: #FFF8EE;color: #FC7D3C;font-size: 18px;.marquee-box{flex: 1;min-width: 0px;margin-left: .2rem;overflow: hidden;}.marquee{display: inline-block;white-space:nowrap;}.iconfont{font-size: 1.875rem;line-height: 1;}}.h5{.box{padding: .5rem 0;font-size: 0.875rem;}.iconfont{font-size: 1.2rem;}}
</style>

方式二：利用原生跑马灯标签，简单。

缺点：不能定义速度。

<template><div class="box"><i class="iconfont icon-gonggao"></i><marquee bgcolor= "#FFF8EE"><slot></slot></marquee></div>
</template>
<style lang="less" scoped>.box{display: flex;align-items: center;padding: 1.875rem 0 1.875rem 1rem;background-color: #FFF8EE;color: #FC7D3C;font-size: 18px;.iconfont{font-size: 1.875rem;line-height: 1;}}.h5{.box{padding: .5rem 0;font-size: 0.875rem;}.iconfont{font-size: 1.2rem;}}
</style>