vue不操作dom实现图片轮播的示例代码

<ul>
 <li
	v-for="(demo,index) in demoList"
	:key="index"
	:class="{'demo-left':demoStyle(index) == 0,'demo-active':demoStyle(index) == 1,'demo-right':demoStyle(index) == 2}"
 >
	<img :src="demo.img" alt />
 </li>
</ul>

ul {
 position: relative;
 width: 1190px;
 height: 500px;
 margin: 0 auto;
 display: flex;
}

ul > li {
 position: absolute;
 width: 480px;
 min-width: 480px;
 height: 400px;
 top: 50px;
 bottom: 50px;
 left: 355px;
 font-size: 0;	/* 去除img标签留白，与轮播无关 */
 overflow: hidden;
 background: white;
 box-shadow: 0 0 10px 0 #dddddd;
 transition: 0.6s;
 z-index: 1;
}

ul > .demo-left {
 left: 0;
 z-index: 2;
}

ul > .demo-active {
 width: 600px;
 min-width: 600px;
 height: 500px;
 top: 0;
 bottom: 0;
 left: 295px;
 z-index: 3;
}

ul > .demo-right {
 left: 710px;
 z-index: 2;
}

ul > li > img {
 position: absolute;
 width: 100%;
 top: 0;
 right: 0;
 bottom: 0;
 left: 0;
 margin: auto;
}

export default {
 name: "demo",
 data() {
	return {
	 demoList: [	// 图片列表
    {
		 id: "1",
		 src: "图片路径"
		},
		{
		 id: "2",
		 src: "图片路径"
		},
		{
		 id: "3",
		 src: "图片路径"
		},
		{
		 id: "4",
		 src: "图片路径"
		},
		{
		 id: "5",
		 src: "图片路径"
		}
	 ],
	 demoActive: 0,	// 当前显示的li下标，设置为0，表示首次加载显示第一张图片
   demoTimer: null	// 定时器，声明demoTimer方便停止轮播和重新开始![在这里插入图片描述](https://img-blog.csdnimg.cn/20191217174439432.gif)轮播
	}
 },
 methods: {
 	// 根据返回值给li添加className
 	demoStyle(index) {
   if (index == this.demoActive - 1) return 0;
   if (index == this.demoActive ) return 1;
   if (index == this.demoActive + 1) return 2;
   if (this.demoActive == 0 && index == this.demoList.length - 1) return 0;
   if (this.demoActive == this.demoList.length - 1 && index == 0) return 2;
  },
  // 轮播执行
  demoCarousel() {
   this.demoActive++;
   if (this.demoActive > this.demoList.length - 1) {
    this.demoActive= 0;
   }
  }
 },
 mounted() {
  let _self = this;
  _self.$nextTick(function () {
   // 开始轮播，3秒一次
   _self.demoTimer = setInterval(_self.demoCarousel, 3000);
  });
 }
}