Comment implémenter le scroller en vue pour revenir à la page et mémoriser la position de défilement

router:
{
path: '/actlist',
name: 'actlist',
component: actlist,
meta: {
keepAlive: true
}
}

<keep-alive>
<router-view v-if="$route.meta.keepAlive"></router-view>
</keep-alive>
<router-view v-if="!$route.meta.keepAlive"></router-view>

beforeRouteEnter(to,from,next){
if(!sessionStorage.askPositon || from.path == '/'){//当前页面刷新不需要切换位置
sessionStorage.askPositon = '';
next();
}else{
next(vm => {
if(vm && vm.$refs.my_scroller){//通过vm实例访问this
setTimeout(function () {
vm.$refs.my_scroller.scrollTo(0, sessionStorage.askPositon, true);
},0)//同步转异步操作
}
})
}
},
beforeRouteLeave(to,from,next){//记录离开时的位置
sessionStorage.askPositon = this.$refs.my_scroller && this.$refs.my_scroller.getPosition() && this.$refs.my_scroller.getPosition().top;
next()
}