2、使用Pinia

• 安装

npm install pinia

• mian.js中 创建一个 pinia（根存储）

import { createApp } from 'vue'
import { createPinia } from 'pinia'

const app = createApp(App)
app.use(createPinia())

• 定义一个Store(/src/store/goods/index.js)

import { defineStore } from "pinia";
//
export const goodStore = defineStore('goodStore', {
   state:()=>{
    return {
        goodcount: 100 
    }
   },
   //
   actions: {
    setGoodCount(){
        this.goodcount++
    }
   }
})

• 使用stroe(src/views/goods/index.vue)

<script lang="ts" setup>
import { goodStore } from '@/store/goods/index'
const goodCount = goodStore();
goodCount.setGoodCount();
console.log('goodCount ==== ', goodCount.goodcount);

</script>