效果：

代碼：

<template> <div class='back-top'> <div > <img src='http://www.b3g6.com/bcjs/imgsrc' : : @click='backTop'> </div> </div></template><script>export default { name: 'backTop', data(){ return { firstShow: false,//初始化隱藏組件 isHide: false, scrollFLag: true, } }, created() { document.addEventListener(’scroll’, () => { let scroll = document.documentElement.scrollTop if(scroll > 200){ this.isHide = false this.firstShow = true }else{ this.isHide = true } }) }, methods: { backTop(){ if(this.scrollFLag){ this.scrollFLag = false //屏幕高度 let scroll = document.documentElement.scrollTop let scrollTimer = setInterval(()=> { scroll -= 50 document.documentElement.scrollTop = Math.max(scroll, 0) if( scroll <= 0){ clearInterval(scrollTimer) } }, 10) this.scrollFLag = true } }, },}</script><style scoped lang='scss'>.back-top{ position: fixed; top: 0; right: 10vw; width: 20px; height: 500px; z-index: 200; .line{ width: 12vw; height: 100%; z-index: 20; cursor: pointer; opacity: 0.8; transform: translateY(-100%); &:hover{ opacity: 1; } } .isShow{ animation: back-top-move 0.5s forwards linear, back-top-yurayura 2s 0.6s forwards linear infinite; } .isHide{ animation: back-top-hide 0.5s forwards linear; }}@keyframes back-top-hide { from { transform: translateY(0); } to { transform: translateY(-100%); }}@keyframes back-top-move { to { transform: translateY(0); }}@keyframes back-top-yurayura { 0%{transform-origin: top center;transform: rotate(0)} 25%{transform-origin: top center;transform: rotate(2deg)} 75%{transform-origin: top center;transform: rotate(-2deg)} 100%{transform-origin: top center;transform: rotate(0)}}</style>

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