vueにおけるkeep-alive,includeのキャッシュの問題

1.app.vue

export default {
  data () {
    return {}
  },
  computed: {
    keepAlive () {
      return this.$store.getters.keepAlive
    }
  }
}

2.store.js

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    keepAlive: []
  },
  mutations: {
    SET_KEEP_ALIVE: (state, keepAlive) => {
      state.keepAlive = keepAlive
    }
  },
  getters: {
    keepAlive: state => state.keepAlive
  }
})

3.最初のページvue

    export default {
        name: 'A',
        methods: {
            buttonClick () {
                this.$store.commit('SET_KEEP_ALIVE', ['B', 'C', 'D']) 
　　　　　　　　　 this.$router.push('/B') 
　　　　　　　} 
　　　　　} 
　　}

4.2ページ目vue

    export default {
        name: 'B',
        beforeRouteEnter (to, from, next) {
            next(vm => {
               if (from.path.indexOf('C') > -1) {
                    vm.$store.commit('SET_KEEP_ALIVE', ['B'])
               }
            })
        },
        beforeRouteLeave (to, from, next) {
            if (to.path.indexOf('C') > -1) {
               this.$store.commit('SET_KEEP_ALIVE', ['B', 'C'])
            } else if (to.path.indexOf('A') > -1) {
　　　　　　　　　this.$store.commit('SET_KEEP_ALIVE', [])　
            }
            next()
        }
　}