Vue组件旋转木马动画效果

<template>
  <div id="wrapper">
    <transition-group name="list" tag="ul" mode="out-in">
      <li v-for="(item,index) in piclist" :key="item.url" :style="config[index]">
        <img :src="item.url">
      li>
    transition-group>
    <a href="javascript:;" id="arrLeft" class="prev" @click="turnleft">a>
    <<