五、Vue3中使用Pinia的同步异步操作及getters用法

Pinia的同步操作

src/store/index.ts

import { defineStore } from 'pinia';
import { Names } from './store-name';
type User = {
    name: string,
    age: number
}
const result:User = {
    name: '白素贞',
    age: 999
}
export const useTestStore = defineStore(Names.Test, {
    state:()=>{
        return {
            user: <User>{}
        }
    },
    getters:{ // 类似computed计算属性 同样有缓存的

    },
    actions:{ // 
        setUser(){ // 同步操作 注意此处不要写箭头函数,否则this指向就不对了
            this.user = result;
        }
    }
});

src/store/store-name.ts

export const enum Names {
    Test = 'TEST'
}

组件调用

<template>
     <div>
         <button @click="change">+</button>
          <div>
             {
   
   {Test.counter}}
          </div>    
     </div>
</template>
 
<script setup lang='ts'>
import {useTestStore} from './store'
const Test = useTestStore()
const change = () => {
     Test.setUser()
}
 
</script>
 
<style></style>

Pinia的异步操作

src/store/index.ts

import { defineStore } from 'pinia'
import { Names } from './store-name'
type Result = {
    name: string
    age: number
}
const Login = (): Promise<Result> => {
    return new Promise((resolve) => {
        setTimeout(() => {
            resolve({
                name: '小青',
                age: 999
            })
        }, 3000)
    })
}
export const useTestStore = defineStore(Names.TEST, {
    state: () => ({
        user: <Result>{}
    }),
    actions: {
        async getLoginInfo() { // 异步操作
            const result = await Login()
            this.user = result;
        }
    },
})

组件调用

<template>
  <div>
    actions-user: {
   
   { Test.user }}
  </div>
  <hr />
  <div>
    getters: 
  </div>
  <button  @click="change">change</button>
</template>
<script setup lang="ts">
import { useTestStore } from './store';
const Test = useTestStore();
const change = () => {
  Test.getLoginInfo();
}
</script>
<style scoped></style>

getters用法

import { defineStore } from 'pinia';
import { Names } from './store-name';
export const useTestStore = defineStore(Names.TEST, {
    state:()=>{
        return {
            name: "小飞机"
        }
    },
    getters:{ // 类似computed计算属性 同样有缓存的
        newName():string{
            return `$-${this.name}`
        }
    },
    actions:{ // 
        setUser(){
            this.name = '坦克';
        }
    }
});

使用

<template>
  <div>
    getters: {
   
   { Test.newName }}
  </div>
  <button  @click="change">change</button>
</template>
<script setup lang="ts">
import { useTestStore } from './store';
const Test = useTestStore();
const change = () => {
  Test.setUser();
}
</script>
<style scoped></style>