vue实现滑动超出指定距离回顶部功能

vue实现滑动超出指定距离回顶部功能

1、当页面滑动时执行scrollToTop ()函数,判断滑动的距离是否超出指定距离,注意下面获取getElementsByClassName时,是你被滑动标签的class。

mounted() { window.addEventListener('scroll', this.scrollToTop, true) } scrollToTop () { let This = this let dom = document.getElementsByClassName('content')[0];//获取滑动模块的信息(注意class别写错) This.scrollTop = dom.scrollTop; if (This.scrollTop > 200) { This.btnFlag = true } else { This.btnFlag = false } }

2、当超出指定距离会出来向上的小图标,点击执行backTop ()函数回顶部。图标我是用的阿里矢量图标引入到项目中,样式自己调一下。

// 点击图标回到顶部方法,加计时器是为了缓慢回到顶部 backTop () { let This = this let timer = setInterval(() => { let ispeed = Math.floor(-This.scrollTop / 5) document.getElementsByClassName('content')[0].scrollTop = This.scrollTop + ispeed if (This.scrollTop === 0) { clearInterval(timer) } }, 16) },

完整代码请看下面:

<template> <div> <div v-if="btnFlag"> <li @click="backTop()"></li> </div> </div> </template> <script> import { httpGetMethod } from '../common/httpService' export default { name: 'scrollTop', data: function () { return { btnFlag:false, scrollTop:0//当前滑动距离 } }, mounted() { window.addEventListener('scroll', this.scrollToTop, true) }, destroyed () { window.removeEventListener('scroll', this.scrollToTop, true) }, methods: { // 点击图标回到顶部方法,加计时器是为了缓慢回到顶部 backTop () { let This = this let timer = setInterval(() => { let ispeed = Math.floor(-This.scrollTop / 5) document.getElementsByClassName('content')[0].scrollTop = This.scrollTop + ispeed if (This.scrollTop === 0) { clearInterval(timer) } }, 16) }, // 计算距离顶部的高度,当高度大于200显示回顶部图标,小于200则隐藏 scrollToTop () { let This = this let dom = document.getElementsByClassName('content')[0];//获取滑动模块的信息(注意class别写错) This.scrollTop = dom.scrollTop; if (This.scrollTop > 200) { This.btnFlag = true } else { This.btnFlag = false } } } } </script> <style lang="scss"> @import '../styles/mixin'; .scrollTop-wrap { position: relative; .go-top{ position: absolute; top: 430px; left: 260px; z-index: 15; .iconhuidaodingbu{ font-size: 30px; color: #87878A; background-color:#fff; border-radius: 50%; } } } </style>

在其他页面引用一下:

<template> <div> <div calss="content"> 这里是你的滑动内容 </div> <scrollTop></scrollTop> </div> </template> <script> import scrollTop from '../components/scrollTop' export default { name: 'wtll', data: function () { return { } }, components: { scrollTop }, methods: { } } </script>

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