vue滑动切换页面（vue实现点击翻转效果）

//html代码   测试 demo命名随便复制来的
<li class="Demo">
        <li class="Before" :class="isTop  ? 'contain-Before' : ''" @click="handleBefore"></li>
        <li class="After" :class="isTop  ? 'contain-After' : ''" @click="handleAfter" style="font-size:20px;color:black">这个是背面内容</li>
    </li>

//在data中定义
isTop:false

//methods中的方法
handleBefore(){
  if(!this.isTop){
         this.isTop = true
     }
 },
 handleAfter(){
     if(this.isTop){
         this.isTop = false
     }
 }

//css
.Demo{
    width: 375px;
    height: 300px;
    margin-top: 50px;
    /* margin-left: 500px; */
    position: relative;
    perspective: 800px;
    box-sizing: border-box;
    
    
}
.Before{
    width: 100px;
    height: 200px;
    position: absolute;
    top:0;
    left: 0;
    background-repeat: no-repeat;
    background-position: center center;
    backface-visibility: hidden;
    transition: 1.5s;
    background-image:url('../assets/images/chunfen4.jpg" alt="vue滑动切换页面（vue实现点击翻转效果）" border="0" />