vue利用better-scroll实现轮播图与页面滚动详解

更新时间：2020-06-11 15:06:01 作者：startmvc

前言better-scroll也很强大,不仅可以做普通的滚动列表,还可以做轮播图、picker等等...所以本文

前言

better-scroll 也很强大,不仅可以做普通的滚动列表,还可以做轮播图、picker 等等...所以本文主要给大家介绍了关于vue用better-scroll实现轮播图与页面滚动的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。

1.安装better-scroll

在根目录中package.json的dependencies中添加：


"better-scroll": "^0.1.15"

然后 npm i 安装。

2.封装代码

将better-scroll封装成两个基础组件slider和scroll放于src/base文件夹中。

slider.vue 代码


<template>
 <div class="slider" ref="slider">
 <div class="slider-group" ref="sliderGroup">
 <slot>
 </slot>
 </div>
 <div class="dots">
 <span class="dot" :class="{active: currentPageIndex === index }" v-for="(item, index) in dots"></span>
 </div>
 </div>
</template>

<script>
 import {addClass} from '../common/js/dom'
 import BScroll from 'better-scroll'
 export default{
 data() {
 return {
 dots:[],
 currentPageIndex: 0
 }
 },
 props:{
 loop:{
 type:Boolean,
 default:true
 },
 autoPlay:{
 type:Boolean,
 default:true
 },
 interval:{
 type: Number,
 default:4000
 }
 },
 mounted() {
 this._setSliderWidth()
 setTimeout(() => {
 // 在初始化slider前初始化dot
 this._initDots()
 this._initSlider()
 if (this.autoPlay) {
 this._play()
 }
 }, 20)
 // 监听窗口大小改变时间
 window.addEventListener('resize', () => {
 if (!this.slider) {
 return
 }
 this._setSliderWidth(true)
 this.slider.refresh()
 })
 },
 methods:{
 _setSliderWidth(isResize) {
 this.children = this.$refs.sliderGroup.children
 let width = 0
 // slider 可见宽度
 let sliderWidth = this.$refs.slider.clientWidth
 for (let i = 0; i < this.children.length; i++) {
 let child = this.children[i]
 // 设置每个子元素的样式及高度
 addClass(child, 'slider-item')
 child.style.width = sliderWidth + 'px'
 // 计算总宽度
 width += sliderWidth
 }
 // 循环播放首尾各加一个,因此总宽度还要加两倍的宽度
 if (this.loop && !isResize) {
 width += 2 * sliderWidth
 }
 this.$refs.sliderGroup.style.width = width + 'px'
 },
 _initSlider() {
 this.slider = new BScroll(this.$refs.slider, {
 scrollX: true,
 scrollY: false,
 momentum: false,
 snap: true,
 snapLoop: this.loop,
 snapThreshold: 0.3,
 snapSpeed: 400,
 // click:true
 })
 // 监听滚动结束时间获取pageX
 this.slider.on('scrollEnd', () => {
 let pageIndex = this.slider.getCurrentPage().pageX
 if (this.loop) {
 // 由于bscroll循环播放首尾各加一个,因此索引-1
 pageIndex -= 1
 }
 this.currentPageIndex = pageIndex
 if (this.autoPlay) {
 this._play()
 }
 })
 this.slider.on('beforeScrollStart', () => {
 if (this.autoPlay) {
 clearTimeout(this.timer)
 }
 })
 },
 _initDots() {
 // 长度为n的空数组
 this.dots = new Array(this.children.length)
 },
 _play() {
 // currentPageIndex为不含首尾副本的索引，因此若有循环要+2
 let pageIndex = this.currentPageIndex + 1
 if (this.loop) {
 pageIndex += 1
 }
 this.timer = setTimeout(() => {
 this.slider.goToPage(pageIndex, 0, 400)
 }, this.interval)
 }
 },
 // 生命周期destroyed销毁清除定时器，有利于内存释放
 destroyed() {
 clearTimeout(this.timer)
 },
 }
</script>
<style scoped>
 .slider{
 min-height: 1px;
 position: relative;
 }

 .slider-group{
 position: relative;
 overflow: hidden;
 white-space: nowrap;
 }

 .slider-item{
 float: left;
 box-sizing: border-box;
 overflow: hidden;
 text-align: center;
 height: 150px;
 overflow: hidden;
 }

 .slider-item a{
 display: block;
 width: 100%;
 overflow: hidden;
 text-decoration: none;
 }


 .slider-item img{
 display: block;
 width: 100%;
 }

 .dots{
 position: absolute;
 right: 0;
 left: 0;
 bottom: 12px;
 text-align: center;
 font-size: 0;
 }

 .dot{
 display: inline-block;
 margin: 0 4px;
 width: 8px;
 height: 8px;
 border-radius: 50%;
 background: red;
 }

 .active{
 width: 20px;
 border-radius: 5px;
 }
</style>

该代码引用common/js/dom.js中的addClass()方法为每个轮播图添加一个slider-item类，dom.js代码如下：


export function hasClass (el, className) {
 // 开始或空白字符+类名+空白字符或结束
 let reg = new RegExp('(^|\\s)' + className + '(\\s|$)')
 // 测试元素是否有该类名，返回布尔值
 return reg.test(el.className)
}

export function addClass (el, className) {
 if (hasClass(el, className)) {
 return
 }
// 以空白符为切割位置切割生成新数组
 let newClass = el.className.split(' ')
// 数组中加入新类名
 newClass.push(className)
// 将数组元素放入一个字符串，以空白符间隔
 el.className = newClass.join(' ')
}

scroll.vue代码


<template>
 <div ref="wrapper">
 <slot></slot>
 </div>
</template>

<script>
 import BScroll from 'better-scroll'

 export default {
 props: {
 probeType: {
 type: Number,
 default: 1
 },
 click: {
 type: Boolean,
 default: true
 },
 listenScroll: {
 type: Boolean,
 default: false
 },
 object: {
 type: Object,
 default: null
 },
 data: {
 type: Array,
 default: null
 },
 string: {
 type: String,
 default: ''
 },
 pullup: {
 type: Boolean,
 default: false
 },
 beforeScroll: {
 type: Boolean,
 default: false
 },
 refreshDelay: {
 type: Number,
 default: 20
 }
 },
 mounted() {
 setTimeout(() => {
 this._initScroll()
 }, 20)
 },
 methods: {
 _initScroll() {
 if (!this.$refs.wrapper) {
 return
 }
 this.scroll = new BScroll(this.$refs.wrapper, {
 probeType: this.probeType,
 click: this.click
 })

 if (this.listenScroll) {
 let me = this
 // pos为位置参数
 this.scroll.on('scroll', (pos) => {
 me.$emit('scroll', pos)
 })
 }

 if (this.pullup) {
 this.scroll.on('scrollEnd', () => {
 if (this.scroll.y <= (this.scroll.maxScrollY + 50)) {
 this.$emit('scrollToEnd')
 }
 })
 }

 if (this.beforeScroll) {
 this.scroll.on('beforeScrollStart', () => {
 this.$emit('beforeScroll')
 })
 }
 },
 disable() {
 this.scroll && this.scroll.disable()
 },
 enable() {
 this.scroll && this.scroll.enable()
 },
 refresh() {
 this.scroll && this.scroll.refresh()
 },
 scrollTo() {
 this.scroll && this.scroll.scrollTo.apply(this.scroll, arguments)
 },
 scrollToElement() {
 this.scroll && this.scroll.scrollToElement.apply(this.scroll, arguments)
 }
 },
 watch: {
 data() {
 setTimeout(() => {
 this.refresh()
 }, this.refreshDelay)
 },
 string() {
 setTimeout(() => {
 this.refresh()
 }, this.refreshDelay)
 },
 object() {
 setTimeout(() => {
 this.refresh()
 }, this.refreshDelay)
 }
 }
 }
</script>
<style>
</style>

3.使用封装组件

使用这两个组件的页面组件home.vue 代码如下：


<template>
 <div>
 <scroll :data="su" class="scroll">
 <div>
 <div class="slider-wrapper">
 <slider>
 <div v-for='item in slider'>
 <a href="">
 <img :src="item.url" alt="">
 </a>
 </div>
 </slider>
 </div>
 <ul v-for='item in su'>
 <li>{{item}}</li>
 </ul>
 </div>
 </scroll>
 </div>
</template>
<script>
 import Slider from '../base/slider'
 import Scroll from '../base/scroll'
export default {
 data () {
 return {
 slider: [
 {url: 'http://upload-images.jianshu.io/upload_images/7932253-54c81df0beed405b.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1080/q/50'},
 {url: 'https://y.gtimg.cn/music/photo_new/T003R720x288M000004ERTpn1UBu2f.jpg?max_age=2592000&max_age=2592000'},
 {url: 'https://y.gtimg.cn/music/photo_new/T003R720x288M00000077s7P0HaZpc.jpg?max_age=2592000&max_age=2592000'},
 {url: 'https://y.gtimg.cn/music/photo_new/T003R720x288M000001QL1Si05yMPq.jpg?max_age=2592000&max_age=2592000'},
 {url: 'https://y.gtimg.cn/music/photo_new/T003R720x288M000002ke7OC3ooZ5g.jpg?max_age=2592000&max_age=2592000'},
 ],
 su:[1,2,3,4,5,6,7,8,9,10,1,2,3,4,2,3,5,8,7,4,]
 }
 },
 methods: {
 },
 components: {
 Slider,
 Scroll
 }
}
</script>
<style>
.slider-wrapper{
 width: 100%;
 position: relative;
 overflow: hidden;
}
.scroll{
 height: 500px;
}
</style>

注意点：

slider组件的父元素必须给他一个100%的宽度且定义overflow:hidden，否则整个页面会被撑开，整个页面都能横向滚动 scroll组件在引用时必须给他一个固定高度。只有拥有固定高度才会发生滚动。

效果图如下：