Vue3中怎么引入Pinia存储库并使用

1.用自己最喜欢的方式安装

yarn add pinia
# 或者使用 npm
npm install pinia

2.main.js引入

import { createApp } from &#39;vue&#39;
import App from &#39;./App.vue&#39;
 
const app=createApp(App)
import { createPinia } from &#39;pinia&#39; //引入pinia
app.use(createPinia())
 
app.mount(&#39;#app&#39;)

3.创建store文件并配置内部的index.js文件

import { defineStore } from &#39;pinia&#39; //引入pinia
 
//这里官网是单独导出  是可以写成默认导出的  官方的解释为大家一起约定仓库用use打头的单词 固定统一小仓库的名字不易混乱
export const useCar=defineStore("test",{ 
    state: () =>{
        return  ({
            msg:"这是pinia",
            name:"小小",
            age:18
            }) //为了避免出错，返回的值用()包起来
    } 
})

4.组件使用方法

<template>
    <h2>{{store.msg}}{{store.name}}{{store.age}}</h2>
    <button @click="modify">修改store.name</button>
</template>
 
<script>
import { defineComponent, ref } from &#39;vue&#39;;
import {
  reactive,
  toRefs,
  onMounted,
  onActivated
} from "vue";
import {useCar} from "../store/index.js" //将之前配置的pinia文件夹中的index.js文件引入
export default defineComponent({
  let store=useCar() //接收
  setup() {
    const state = reactive({
      testMsg: "原始值",
    });
    onMounted(async () => {});
    onActivated(() => {})
    const methods = {
        modify(){
             store.name = state.testMsg //修改pinia里面的数据
             console.log(store.name)
        }
    };
    return {
      ...toRefs(state),
      ...methods,
    };
  }
})
</script>

5.重置store.$reset()

<template>
    <h2>{{store.msg}}{{store.name}}{{store.age}}</h2>
    <button @click="reset">重置store.name</button>
</template>
 
<script>
import { defineComponent, ref } from &#39;vue&#39;;
import {
  reactive,
  toRefs,
  onMounted,
  onActivated
} from "vue";
import {useCar} from "../store/index.js" //将之前配置的pinia文件夹中的index.js文件引入
export default defineComponent({
  let store=useCar() //接收
  setup() {
    const state = reactive({
      testMsg: "原始值",
    });
    onMounted(async () => {});
    onActivated(() => {})
    const methods = {
        reset(){
             store.$reset() //重置pinia里面的数据
             console.log(store.name)
        }
    };
    return {
      ...toRefs(state),
      ...methods,
    };
  }
})
</script>

6.群体修改store.$patch,可以将pinia的数据进行同一修改

特点：批量修改但状态只刷新一次

<template>
    <h2>{{store.msg}}{{store.name}}{{store.age}}</h2>
    <button @click="modify">修改store.name</button>
    <button @click="reset">重置store.name</button>
    <button @click="allModify">群体修改store.name</button>
</template>
 
<script>
import { defineComponent, ref } from &#39;vue&#39;;
import {
  reactive,
  toRefs,
  onMounted,
  onActivated
} from "vue";
import {useCar} from "../store/index.js" //将之前配置的pinia文件夹中的index.js文件引入
export default defineComponent({
  let store=useCar() //接收
  setup() {
    const state = reactive({
      testMsg: "原始值",
    });
    onMounted(async () => {});
    onActivated(() => {})
    const methods = {
        modify(){
             store.name = state.testMsg //修改pinia里面的数据
             console.log(store.name)
        },
        reset(){
             store.$reset() //重置pinia里面的数据
             console.log(store.name)
        },
        allModify(){
             store.$patch({
              name:"花花",
              age:20,
            })
        }
    };
    return {
      ...toRefs(state),
      ...methods,
    };
  }
})
</script>

7.订阅修改

//可以通过 store 的 $subscribe() 方法查看状态及其变化,通过patch修改状态时就会触发一次
store.$subscribe((mutation, state) => { 
  // 每当它发生变化时，将整个状态持久化到本地存储
  localStorage.setItem(&#39;hello&#39;, JSON.stringify(state))
})

8.Getter

Getter 完全等同于 Store 状态的计算值。它们可以用 defineStore() 中的 getters 属性定义。他们接收“状态”作为第一个参数以鼓励箭头函数的使用：(ps:虽然鼓励但是依然提供了非es6玩家的使用方式内部可以用this代表state)

//store/index.js文件
export const useStore = defineStore(&#39;main&#39;, {
  state: () => ({
    counter: 0,
  }),
  getters: {
    doubleCount: (state) => state.counter * 2,
  },
})
 
//组件中直接使用:  <p>Double count is {{ store.doubleCount }}</p>

9.Actions

在pinia中没有提供mutaion 因为Actions就够了(它可以异步同步的统一修改状态)之所以提供这个功能就是为了项目中的公共修改状态的业务统一

export const useStore = defineStore(&#39;main&#39;, {
  state: () => ({
    counter: 0,
  }),
  actions: {
    increment() {
      this.counter++//1.有this
    },
    randomizeCounter(state) {//2.有参数   想用哪个用哪个
      state.counter = Math.round(100 * Math.random())
    },
    randomizeCounter(state) {
        //异步函数.接口成功赋值
     ajax.hplBaseApi("app/productSelection/categoryRows", {}, "post").then((res) => {
        state.counter = res.data.length
     });
    }
  },
})
 
//组件中的使用:
  setup() {
    const store = useStore()
    store.increment()
    store.randomizeCounter()
  }

以上就是Vue3中怎么引入Pinia存储库并使用的详细内容，更多请关注其它相关文章！