.vux-pop-out-enter-active,
.vux-pop-out-leave-active,
.vux-pop-in-enter-active,
.vux-pop-in-leave-active {
 will-change: transform;
 transition: all 500ms;
 height: 100%;
 position: absolute;
 backface-visibility: hidden;
 perspective: 1000;
}
.vux-pop-out-enter {
 opacity: 0;
 transform: translate3d(-100%, 0, 0);
}
.vux-pop-out-leave-active {
 opacity: 0;
 transform: translate3d(100%, 0, 0);
}
.vux-pop-in-enter {
 opacity: 0;
 transform: translate3d(100%, 0, 0);
}
.vux-pop-in-leave-active {
 opacity: 0;
 transform: translate3d(-100%, 0, 0);
}

.router-view{
  width: 100%;
  position: absolute;
  -webkit-transition: all .3s cubic-bezier(.55,0,.1,1);
  -moz-transition: all .3s cubic-bezier(.55,0,.1,1);
  -ms-transition: all .3s cubic-bezier(.55,0,.1,1);
  -o-transition: all .3s cubic-bezier(.55,0,.1,1);
  transition: all .3s cubic-bezier(.55,0,.1,1);
  height:100%;
 }

<template>
 <div id="app">
  <transition :name="transitionName">  
   <router-view class="router-view"></router-view>
  </transition>
 </div>
</template>

export default {
  name: 'app',
  data(){
   return {
    transitionName:'vux-pop-in'
   }
  },
 }

watch:{
  $route(to, from) {
   if(to.meta.index > from.meta.index){
    this.transitionName = 'vux-pop-in';
   }else{
    this.transitionName = 'vux-pop-out';
   }
  }
 }