vue.js实现回到顶部动画效果

时间:2021-04-03 人气:0

最近使用vue.js做了几个页面，其中有一个回到顶部的动画效果记录下。

html如下：

<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>回到顶部</title>
 <META HTTP-EQUIV="pragma" CONTENT="no-cache"> 
 <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> 
 <META HTTP-EQUIV="expires" CONTENT="0">
 <meta http-equiv="X-UA-Compatible" content="IE=Edge">
 <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"/>
 <link rel="stylesheet" href="./backTop.css" type="text/css"/>
 </head>
 <body>
 <div class="page">1</div>
 <div class="page">2</div>
 <div class="page">3</div>
 <div class="page">4</div>
 <div class="page">5</div>
 <div id="back-to-top" class="back-to-top" @click="backToTop" v-show="backTopShow" v-cloak>
 <span>回到</span>
 <span>顶部</span>
 </div>
 <script src="https://cdn.bootcss.com/vue/2.5.16/vue.min.js"></script>
 <script src="./backTop.js" type="text/javascript"></script>
 </body>
</html>

backTop.css如下：

* {
 margin: 0px;
 padding: 0px;
 border: 0;
}
 
html, body {
 width: 100%;
 height: 100%;
 position: relative;
 background: #F2F2F2;
 overflow-x: hidden;
 overflow-y: auto;
 z-index: 1;
}
 
[v-cloak] {
 display: none;
}
 
.back-to-top {
 position: fixed;
 bottom: 5px;
 right: 20px;
 z-index: 100;
 border-radius: 5px;
 box-shadow: 0px 0px 2px #222;
 padding: 8px 10px;
 cursor: pointer;
}
 
.back-to-top:hover {
 background: #5AC4D1;
}
 
.back-to-top:hover span {
 color: white;
}
 
.back-to-top span {
 display: block;
}
 
.page {
 width: 100%;
 height: 400px;
 line-height: 400px;
 text-align: center;
}
 
.page:nth-child(odd) {
 background: white;
}

backTop.js 如下：

var backTopVue = new Vue({
 el : "#back-to-top",
 data : {
 //是否显示回到顶部
 backTopShow : false,
 // 是否允许操作返回顶部
 backTopAllow : true,
 // 返回顶部所需时间
 backSeconds : 100,
 // 往下滑动多少显示返回顶部（单位：px）
 showPx : 200
 },
 mounted : function() {
 window.addEventListener("scroll", this.backTopShowOperate, true);
 },
 methods : {
 backTopShowOperate : function() {
 if (!this.backTopAllow) return;
 if (document.body.scrollTop > this.showPx) {
 this.backTopShow = true;
 } else {
 this.backTopShow = false;
 }
 },
 backToTop : function() {
 if (!this.backTopAllow) return;
 this.backToTopShow = false;
 this.backTopAllow = false;
 var step = document.body.scrollTop / this.backSeconds;
 var backTopInterval = setInterval(function() {
 if (document.body.scrollTop > 0) {
 document.body.scrollTop -= step;
 } else {
 backTopVue.backTopAllow = true;
 clearInterval(backTopInterval);
 }
 }, 1);
 }
 }
});

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