用vue写一个仿简书的轮播图的示例代码

$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: $sHeight;
    left: 0;
    transition: .4s ease-out;
  }
  .extra-slide-{
    : -$sHeight;
  }
  .extra-slide-middle-first{
    : 0;
    z-index: 2
  }
  .extra-slide-middle-second{
    : $sHeight;
    z-index: 2
  }
  .extra-slide-bottom{
    : $height
  }
  .extra-slide-hide{
    display: none!important;
  }
}

<div id="slider-wrapper" @mouseover="s" @mouseout="start">
  <!-- 轮播图1，mainSlide -->
  <div class="main-slide" :style="`background: url(${slideConfig[nowIndex].src})`"></div>
  <!-- 轮播图2，extraSlide -->
  <div class="extra-slide">
    <div class="extra-slide-item" :class="slideClass(i)" v-for="(v, i) in slideConfig" :key="i" :style="`background: url(${v.src}); background-size: cover`"></div>
  </div>
</div>

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-'],
        [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)
    },
    s() {
      clearInterval(this.slideInterval)
      this.slideInterval = null
    }
  },
  mounted() {
    this.start()
  },
  destroyed() {
    this.s()
  }
}

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

<slider :slideConfig="slideConfig" />