1.先展示最终效果:
2.解决思路
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。动画效果交给transition完成。可以将轮播图看成两个(mainSlide和extraSlide),各个图片的位置如图所示:
3.代码实现
各个slide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: $height } .extra-slide-hide{ display: none!important; } }
模板包含两个轮播图:
<div @mouseover="stop" @mouseout="start"> <!-- 轮播图1,mainSlide --> <div :style="`background: url(${slideConfig[nowIndex].src})`"></div> <!-- 轮播图2,extraSlide --> <div> <div :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,这里使用了es6的map类型,详情点击:https://www.jb51.net/article/111734.htm
export default { name: 'slider', data: function() { return { slideInterval: null, nowIndex: 0, slideLength: this.slideConfig.length } }, props: { slideConfig: { type: Array } }, methods: { // 限制index不能超出图片列表长度 resetIndex(i) { return i > this.slideLength - 1 ? i - this.slideLength : i }, slideClass(i) { let nowIndex = this.nowIndex // Map就是key也可以是非字符串的对象,不用Map多写几个 if else 也可以 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'] ]) // 图片的class根据nowIndex的变化而变化 return map.get(i) ? map.get(i) : 'extra-slide-hide' }, start() { // 定时改变nowIndex this.slideInterval = setInterval(() => { this.nowIndex = this.nowIndex > this.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,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
使用:
<slider :slideConfig="slideConfig" />
2018/3/12 16:55 : slideConfig已修改成Props,提取slider.vue就可以直接用了
gitHub传送门:https://github.com/bougieL/jianshuslider