<template>
 <div id="app">
 <transition :name="transitionName">
 <keep-alive >
 <router-view v-if="$route.meta.keepAlive" class="Router"></router-view>
 </keep-alive>
 </transition >
 <transition :name="transitionName">
 <router-view v-if="!$route.meta.keepAlive" class="Router"></router-view>
 </transition >
 <Play></Play>
 </div>
</template>
<script>import Play from './components/play'
export default {
 name: 'App',
 data () {
 return {
 transitionName: 'slide-left'
 }
 },
 watch: {
 '$route' (to, from) {
 // 切换动画
 let isBack = this.$router.isBack // 监听路由变化时的状态为前进还是后退
 if (isBack === true) {
 this.transitionName = 'slide-right'
 // from.meta.keepAlive = false
 // to.meta.keepAlive = true
 } else {
 // from.meta.keepAlive = true
 // to.meta.keepAlive = false
 // this.transitionName = 'slide-left'
 if (this.$route.path.split('/').length < 3) {
 this.transitionName = 'slide-fade'
 } else {
 this.transitionName = 'slide-left'
 }
 }
 this.$router.isBack = false
 }
 },
 components: {
 Play
 }
}
</script>

<style>
.Router {
 font-family: Roboto, Lato, sans-serif;
 position: absolute;
 width: 100%;
 height: 100%;
 padding-bottom: 60px;
 transition: all .377s ease;
 box-sizing: border-box;
 overflow: auto;
}
.slide-left-enter,
.slide-right-leave-active {
 opacity: 0;
 -webkit-transform: translate(100%, 0);
 transform: translate(100%, 0);
}

.slide-left-leave-active,
.slide-right-enter {
 opacity: 0;
 -webkit-transform: translate(-100%, 0);
 transform: translate(-100% 0);
}
.ovf {
 overflow: hidden;
}
.center {
 width: 95%;
 margin: 0 auto;
 overflow-y: hidden;
}
li {
 list-style: none;
}
</style>

{
 path: '/playListDetail/:id',
 name: 'playListDetail',
 component: pather => require(['../components/playListDetail.vue'], pather),
 meta: {
 title: '歌单详情',
 keepAlive: true,
 isBack: false
 }
 },

back () {
 this.$router.go(-1)
 this.$router.isBack = true
 }