修改store

<template>
  <div>{{ store.count }}</div>
  <button @click="add">+1</button>
</template>
<script setup>
import { useStore } from '@/store/index';
let store = useStore()
const add = () => {
  store.count++
}
</script>

<template>
  <div>{{ store.count }}</div>
  <button @click="add">+1</button>
</template>
<script setup>
import { useStore } from '@/store/index';
let store = useStore()
const add = () => {
  store.$patch({
    count: store.count + 1,  
    msg: 'hello pinia!'
  })
}
</script>

import { defineStore } from 'pinia'
export const useStore = defineStore('main', {
  state: () => {
    return {
      msg: 'hello world!',
      count: 0,
      userInfo: {
        name:'张三'
      },
      userItems: []
    }
  },
  getters: {},
  actions: {}
})