1.创建文件

stores
-index.js
-global.js

2.对应文件内容 index.js
安装插件 npm i pinia-plugin-persistedstate

import { createPinia } from 'pinia';
import persist from 'pinia-plugin-persistedstate';
const pinia = createPinia();
pinia.use(persist);
export default pinia;

3.对应文件内容 global.js

import { defineStore } from 'pinia';
import { ref,reactive } from "vue";

export const useGlobalStore = defineStore('global', () => {
  const tabBarStatus = ref('1');
  const system = ref({})
  
  const changeTabBarStatus = (status) => {
    tabBarStatus.value = status; // 示例：改变 tabBarStatus 的值
  };
  const setSystem=(options)=>{
	  system.value=options;
  }
  const getSystem=()=>{
	  return system.value;
  }
  return { 
    tabBarStatus, 
	system,
    changeTabBarStatus,
	setSystem,
	getSystem
  };
},
{
	// 网页端配置
	// persisit:true,
	// 小程序端  修改其设置 获取方法
	persist:{
		storage:{
			getItem(key){
				return uni.getStorageSync(key);
			},
			setItem(key,value){
				uni.setStorageSync(key,value);
			}
		}
	}
	
});

4.注册到main.js中

import App from './App'
// #ifndef VUE3
import Vue from 'vue'
import './uni.promisify.adaptor'
Vue.config.productionTip = false
App.mpType = 'app'
const app = new Vue({
  ...App
})
app.$mount()
// #endif

// #ifdef VUE3
import { createSSRApp } from 'vue'
import pinia from '@/stores/index'
export function createApp() {
  const app = createSSRApp(App)
  app.use(pinia);
  return {
    app
  }
}
// #endif

如果想在utils 下的工具中使用可以使用一下写法

import pinia from '@/stores/index.js'
import { useGlobalStore } from "@/stores/global";
const globalStore = useGlobalStore(pinia)
export default {
	getUploadImageDomainName(){
		return  globalStore.system.img_host;
	}
}