W260426/16.vue3/project/src/store/count.js

import { defineStore } from 'pinia';

export const useCountStore = defineStore('count1', {
    // data
    state() {
        return {
            sum: 10
        }
    },
    // methods
    actions: {
        addSum(val) {
            this.sum += val;
        }
    }
})