一、创建store文件夹下的index.ts

// index.ts
import {createStore,Store} from 'vuex'
import {InjectionKey} from 'vue'

export const key: InjectionKey<Store<state>> = Symbol('key')

export type state ={
  count:number
}
export default createStore({
    state:{
      count:0
    },
    mutations:{
      add(state){
        state.count +=1
      }
    }
  })

二、声明 类型文件

//vuex.d.ts

import {ComponentCustomProperties} from 'vue'
import {Store} from 'vuex'
import { state } from '../store' 
declare module '@vue/runtime-core' {
  interface ComponentCustomProperties {
    $store : Store<state>
  }
}

三、main.ts文件

import { createApp } from 'vue'
import App from './App.vue'
import  Store,{key} from './store'
createApp(App).use(Store,key).mount('#app')

四、组件中使用

//模板中
<template>
	<p>{{this.$store.state.count}}</p> 
	// 这里就可以直接使用 this.$store.state
</template>

<script lang="ts" setup>
import {computed} from 'vue
import {useStore} from 'vuex'
import {key}  from '../store'  //从store文件夹下的index中引入

const store = useStore(key)

// 在计算属性中使用
let counts = computed(()=>{
return store.state.count
}) 

// 方法中调用mutations
let run =()=>{
return	store.commit('add')
}
</script>