安装pinia

pnpm add pinia

Pinia 官网 传送门

main.js引入

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

创建一个pinia,scr/stores/index

import { defineStore } from 'pinia'
import { res } from 'vue'
export default defineStore('store',{
    const name = ref('名称')
    const items = ref([])

    return { name, items }
})

vue组件使用

import useStore from "@/stores/index"
import { storeToRefs } from 'pinia'
const store = useStore()
console.log(useStore.name)

// 解决解构后丢失响应式,引用 storeToRefs
const { name } = storeToRefs(store);

// 取值
store.name 

// 单个修改
store.name = "Abalam"

// 修改普通数据类型
store.$patch({
//   counter: store.counter + 1,
  name: 'Abalam',
})

// 修改普通数据类型 + 复杂数据类型
cartStore.$patch((state) => {
  state.items.push({ name: 'shoes', quantity: 1 })
  state.name = 'Abalam'
})

// 替换state,源码底层也是通过store.$patch去修改的
store.$state = { name:'Abalam', }

pinia 组合式API reset实现 main.js

import { createApp } from 'vue'
import App from './App.vue'
import { createPinia } 'pinia'
const app = createApp(App);
const pinia = createPinia();
pinia.use(store => {
    const beforeStore = store.$state; // 需要深度拷贝
    store.$reset = () => {
        store.$state = beforeStore // 需要深度拷贝
    }
})
app.use(pinia)
app.mount("#app")

订阅pinia的监听

import useStore from "@/stores/index"
const store = useStore()
store.$subscribe((mutation, state) => {
  // import { MutationType } from 'pinia'
  mutation.type // 'direct' | 'patch object' | 'patch function'
  // 与 cartStore.$id 相同
  mutation.storeId // 'cart'
  // 仅适用于 mutation.type === 'patch object'
  mutation.payload // 补丁对象传递给 to cartStore.$patch()

  // 每当它发生变化时，将整个状态持久化到本地存储
  localStorage.setItem('store', JSON.stringify(state))
})

// 此订阅将在组件卸载后保留
store.$subscribe(callback, { detached: true })