用vue實現一個仿簡書的輪播圖效果

 

 

 

先展現最終效果：

解決思路：

vue的理念是以數據驅動視圖，因此拒絕經過改變元素的margin-top來實現滾動效果。

寫好css樣式，只需改變每張圖片的class便可實現輪播效果。能夠將輪播圖當作兩個，如圖所示：

代碼實現：

各個slide的樣式： 

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$width: 800px;      // 容器寬度$height: 300px;     // 容器高度$bWidth: 500px;     // 大圖片寬度$sWidth: $width - $bWidth;  // 小圖片寬度$sHeight: $height / 2;  // 小圖片高度

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#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;    }}

模板包含兩個輪播圖：

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<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，設置一個nowIndex，定時改變nowIndex。全部圖片的class根據這個nowIndex來變化，這裏使用了es6的map類型：

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import slideConfig from './slideConfig'const slideLength = slideConfig.lengthexport 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，這裏能夠寫成組件的props：

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const prefix = '/src/assets/'const slideConfig = [{  src: prefix + 's1.jpg',  title: '圖1',  desc: '說明1'}, {  src: prefix + 's2.jpg',  title: '圖2',  desc: '說明2'}, {  src: prefix + 's3.jpg',  title: '圖3',  desc: '說明3'}, {  src: prefix + 's4.jpg',  title: '圖4',  desc: '說明4'}, {  src: prefix + 's5.jpg',  title: '圖5',  desc: '說明5'}, {  src: prefix + 's6.jpg',  title: '圖6',  desc: '說明6'}]export default slideConfig

gitHub傳送門：https://github.com/bougieL/jianshuslider

本文完〜