Store states in sessionstorage

counter-component.js

//Component
import Counter from '../store/counter';

export default {
    data() {
        return {
        };
    },
    computed: {
        counter() {
            return Counter.state;
        }
    },
    watch: {
        itinerary: {
            handler() {
                sessionStorage.setItem('counter', JSON.stringify(this.$get('counter')));
            },
            deep: true
        }
    },
    ready() {},
    methods: {},
    replace: true,
    template: require('./template.html'),
    components: {

    }
};

counter-store.js

//Store
let session = JSON.parse(sessionStorage.getItem('counter'));
let model = {
    count: 1
};

export default new Vuex.Store({
    state: Object.is(session, null) ? model : session
});