vue利用better-scroll实现轮播图与页面滚动

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>
 <p class="slider" ref="slider">
 <p class="slider-group" ref="sliderGroup">
  <slot>
  </slot>
 </p>
 <p class="dots">
  <span class="dot" :class="{active: currentPageIndex === index }" v-for="(item, index) in dots"></span>
 </p>
 </p>
</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>
 <p ref="wrapper">
 <slot></slot>
 </p>
</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>
 <p>
 <scroll :data="su" class="scroll">
  <p>
   <p class="slider-wrapper">
    <slider>
     <p v-for='item in slider'>
      <a href="">
       <img :src="item.url" alt="">
      </a>
     </p>
    </slider>
   </p>
   <ul v-for='item in su'>
    <li>{{item}}</li>
   </ul>
  </p>
 </scroll>
 </p>
</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：

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