用vue写一个仿简书的轮播图
- 作者:Bougie
- 创建于:2018-04-01
- 更新于:2023-03-09
用 vue 实现简书轮播图
先展示最终效果: 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: 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 0.4s ease;
}
.extra-slide {
width: $sWidth;
position: relative;
.extra-slide-item {
position: absolute;
width: $sWidth;
height: $sHeight;
left: 0;
transition: 0.4s ease-out;
}
.extra-slide-top {
top: -$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