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

<script>
  export default {
    data () {
      return {
        transitionName: 'slide-left'
      }
    },
    watch: {
      $route(to, from) {
        // 有主级到次级
        if (to.meta.index > from.meta.index) {
          this.transitionName = 'slide-left' // 向左滑动
        } else if (to.meta.index < from.meta.index) {
          // 由次级到主级
          this.transitionName = 'slide-right'
        } else {
          this.transitionName = ''   //同级无过渡效果
        }
      }
    }
  }
</script>

<style lang="less">
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  // text-align: center;
  color: #2c3e50;
}

.router-view{
    width: 100%;
    height: auto;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: 0 auto;
    -webkit-overflow-scrolling: touch;
    background-color: #f0f1f5;
}

.slide-right-enter-active,
.slide-right-leave-active,
.slide-left-enter-active,
.slide-left-leave-active{
    height: 100%;
    will-change: transform;
    transition: all 500ms;
    position: absolute;
    backface-visibility: hidden;
}
.slide-right-enter{
    opacity: 0;
    transform: translate3d(-100%, 0, 0);
}
.slide-right-leave-active{
    opacity: 0;
    transform: translate3d(100%, 0, 0);
}
.slide-left-enter{
    opacity: 0;
    transform: translate3d(100%, 0, 0);
}
.slide-left-leave-active{
    opacity: 0;
    transform: translate3d(-100%, 0, 0);
}
</style>
