[JavaScript知识库]store这里应该怎么写？

import {  createStore } from 'vuex'
const store = createStore({
    state() {
        return {
            items: ''
        }
    },
    getters: {
        cartItemCount(state) {
            return function(count) {
                let item = state.items.find(item => item.id === id);
                if(item) {
                    return count;
                }
            }
        }
    }
})

export default store

cart.vue

<template>
    <a href="javascript:;" @click="cart"></a>
    <span>购物车{{ cartItemsCount }}</span>
</template>

<script>
import { mapGetters } from 'vuex'
export default {
    name: 'Cart',
    components: {},
    computed: {
        ...mapGetters('cart', {
            cartItemsCount: 'itemsCount'
        })
    },
    methods: {
        cart() {
            this.$router.push("/cart")
        }
    }
}
</script>

<style>

</style>