原文地址：Bougie的博客
先展示最终效果：
222.gif
Vue的理念是以数据驱动视图，所以拒绝通过改变元素的margin-top来实现滚动效果。写好css样式，只需改变每张图片的class即可实现轮播效果。可以将轮播图看成两个，如图所示：
333.png
写好每个class的样式：
$width: 800px; // 容器宽度
$height: 300px; // 容器高度
$bWidth: 500px; // 大图片宽度
$sWidth: $width - $bWidth; // 小图片宽度
$sHeight: $height / 2; // 小图片高度
#slider-wrapper{
width: $width;
height: $height;
margin: 0 auto;
cursor: pointer;
background: #ddd;
border-radius: 5px;
box-shadow: 0 1px 6px rgba(0,0,0,0.117647), 0 1px 4px rgba(0,0,0,0.117647);
display: flex;
overflow: hidden;
div{
display: inline-block;
}
}
.main-slide{
width: $bWidth;
height: $height;
float: left;
transition: all .4s ease;
}
.extra-slide{
width: $sWidth;
position: relative;
.extra-slide-item{
position: absolute;
width: $sWidth;
height: $sHeight;
left: 0;
transition: .4s ease-out;
}
.extra-slide-top{
top: -$sHeight;
}
.extra-slide-middle-first{
top: 0;
z-index: 2
}
.extra-slide-middle-second{
top: $sHeight;
z-index: 2
}
.extra-slide-bottom{
top: $height
}
.extra-slide-hide{
display: none!important;
}
}
模板包含两个轮播图：
<div id="slider-wrapper" @mouseover="stop" @mouseout="start">
<div class="main-slide" :style="`background: url(${slideConfig[nowIndex].src})`"></div>
<div class="extra-slide">
<div class="extra-slide-item" :class="slideClass(i)" v-for="(v, i) in slideConfig" :key="i" :style="`background: url(${v.src}); background-size: cover`"></div>
</div>
</div>
scripts部分，设置一个nowIndex，定时改变nowIndex。所有图片的class根据这个nowIndex来变化：
import slideConfig from './slideConfig'
const slideLength = slideConfig.length
export default {
name: 'slider',
data: function() {
return {
slideConfig: slideConfig,
slideInterval: null,
nowIndex: 0
}
},
methods: {
resetIndex(i) {
return i > slideLength - 1 ? i - slideLength : i
},
slideClass(i) {
let nowIndex = this.nowIndex
let map = new Map([
[this.resetIndex(nowIndex), 'extra-slide-top'],
[this.resetIndex(nowIndex + 1), 'extra-slide-middle-first'],
[this.resetIndex(nowIndex + 2), 'extra-slide-middle-second'],
[this.resetIndex(nowIndex + 3), 'extra-slide-bottom']
])
return map.get(i) ? map.get(i) : 'extra-slide-hide'
},
start() {
this.slideInterval = setInterval(() => {
this.nowIndex = this.nowIndex > slideLength - 2 ? 0 : this.nowIndex + 1
console.log(this.nowIndex)
}, 2000)
},
stop() {
clearInterval(this.slideInterval)
this.slideInterval = null
}
},
mounted() {
this.start()
},
destroyed() {
this.stop()
}
}
slideConfig，这里可以写成组件的props：
const prefix = '/src/assets/'
const slideConfig = [{
src: prefix + 's1.jpg',
title: '图1',
desc: '说明1'
}, {
src: prefix + 's2.jpg',
title: '图2',
desc: '说明2'
}, {
src: prefix + 's3.jpg',
title: '图3',
desc: '说明3'
}, {
src: prefix + 's4.jpg',
title: '图4',
desc: '说明4'
}, {
src: prefix + 's5.jpg',
title: '图5',
desc: '说明5'
}, {
src: prefix + 's6.jpg',
title: '图6',
desc: '说明6'
}]
export default slideConfig
gitHub传送门：https://github.com/bougieL/jianshuslider
