pinia初始与安装

---

pinia官网

---

https://pinia.vuejs.org/
https://pinia.vuejs.org/introduction.html

pinia安装

---

npm install pinia

main.ts引入pinia

import { createApp } from 'vue'
// import './style.css'
import App from './App.vue'
import router from './router/index'
// 引入element plus
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'
import * as ElementPlusIconsVue from '@element-plus/icons-vue'

//引入pinia构造函数
import { createPinia } from 'pinia'

// 实例化pinia
const pinia = createPinia()

const app = createApp(App);
app.use(router).use(ElementPlus).use(pinia).mount('#app')
// createApp(App).mount('#app')
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
    app.component(key, component)
  }

使用pinia

---

1. 在src下新建store
   然后store下新建test目录与menu，并建index.ts文件
   

    import { defineStore } from "pinia";
    // 创建store
    // defineStore第一个参数：唯一的，不可重复
    export const testStore = defineStore('testStore',{
        state:()=>{
            return{
                count: 0
            }
        },
        // 获取值
        getters:{
            getCount(state){
                return state.count
                // 获取count的值
            }
        },
        // 改变state的值
        actions:{
            setCount(count:number){
                this.count = count;
            }
        }
    })
   

2. HelloWorld.vue

   
    <template>
      <h1>{{ count }}</h1>
      <div>111111</div>
      <el-button>Default</el-button>
      <el-button icon="Edit" type="primary">编辑</el-button>
      <el-button @click="addBtn" icon="Plus" type="success">新增</el-button>
      <el-button type="info">Info</el-button>
      <el-button type="warning">Warning</el-button>
      <el-button type="danger">Danger</el-button>
      <el-icon>
        <Edit />
      </el-icon>
    </template>
    
    <script setup lang="ts">
    import { computed } from 'vue'
    import { testStore } from '@/store/test/index';
    
    // 获取store
    const  store = testStore()
    // 从store里面获取count
    const count = computed(()=>{
      return store.getCount
    })
    
    // 改变store里面的值
    const addBtn = ()=>{
      store.setCount(++store.count)
    }
    </script>
    
    <style scoped>
    .read-the-docs {
      color: #888;
    }
    </style>
   

3. 效果图