vue transition 过渡

//template
  <div id="app">
    <transition name="vux-pop-in">
      <router-view/>
    </transition>
  </div>
//style
.vux-pop-in-enter-active,
.vux-pop-in-leave-active {
 transition: all 500ms;
 position: absolute;
 backface-visibility: hidden;
}
.vux-pop-in-enter {
 opacity: 0;
}
.vux-pop-in-leave-active {
 opacity: 0;
}