路由配置文件里

const router = new VueRouter({
  mode: 'history',
  [
      {
        path: '/',
        name: 'home',
        component: home,
        meta: {
          title: 'home',
          keepAlive: true
        }
      }
  ],
  scrollBehavior (to, from, savedPosition) {
    if (savedPosition) {
      return savedPosition
    } else {
      if (from.meta.keepAlive) {
        from.meta.savedPosition = document.body.scrollTop
      }
      return { x: 0, y: to.meta.savedPosition || 0 }
    }
  }
})

在组件中

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