用vue写一个仿简书的轮播图

作者: Bougie 创建于: 2018-04-01 | Vue

用vue写一个仿简书的轮播图

用 vue 实现简书轮播图

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 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

上次更新: 2019-5-4 13:19:36