vuex

import { inject, reactive, computed } from 'vue'

// 创建唯一常量 用于inject获取数据
const STORE_KEY = 'store-key'

const useStore = () => {
  return inject(STORE_KEY)
}

// 创建store
const createStore = (opts) => {
  return new store(opts)
}

class store {
  constructor(opts) {
    // 将配置数据保存到全局
    this.$store_opts = opts

    // 将store数据通过reactive变成响应式数据
    this.$my_store = reactive({
      data: opts.state()
    })

    // 保存创建的mutations
    this.$store_mutations = opts.mutations
    // 保存创建的actions
    this.$store_actions = opts.actions

    // 保存创建的 getters
    // 使用 Proxy 监听数据返回解包后的getters数据
    this.getters = new Proxy(
      {},
      {
        get: function (target, property) {
          return target[property].value
        }
      }
    )

    // 保护 存在才执行
    if (opts.getters) {
      // 遍历 getters 数据使用 computed 包裹使其自动计算
      Object.keys(opts.getters).map((key) => {
        const func = opts.getters[key]
        this.getters[key] = computed(() => func(this.state))
      })
    }
  }

  // 获取state返回保存的数据
  get state() {
    return this.$my_store.data
  }

  // 接收两个参数 类型 载荷
  commit = (type, payload) => {
    // 获取对应的 mutations 函数
    const func = this.$store_mutations[type]
    if (!func) {
      // 提示不存在
      console.warn('store actions is not', type)
      return func
    } else {
      // 执行函数
      func(this.state, payload)
    }
  }

  dispatch = (type, payload) => {
    // 获取对应的 actions 函数
    const func = this.$store_actions[type]
    if (!func) {
      // 提示不存在
      console.warn('commit mutations is not', type)
      return undefined
    } else {
      // 执行函数 传入this 使其可以解构出 commit、state 等
      // 返回函数 函数是 async 可以外部执行 await
      return func(this, payload)
    }
  }

  // vue 插件注册 固定写法
  install = (app) => {
    // 通过 provide 全局注入数据
    app.provide(STORE_KEY, this)
  }
}

export { createStore, useStore }

创建store 仓库

import { createStore } from './myVuex'

const store = createStore({
  state: () => {
    return {
      num: 1,
      info: {
        name: '',
        age: ''
      }
    }
  },
  mutations: {
    setNum(state, data) {
      state.num = data
    },
    setInfo(state, data) {
      state.info = data
    }
  },
  actions: {
    async getInfo({ commit }) {
      setTimeout(() => {
        commit('setInfo', {
          name: '嘿嘿嘿',
          age: 18
        })
      }, 1000)
    }
  },
  getters: {
    double(state) {
      return state.num * 2
    }
  }
})

export default store

vue注册

import myVuex from './vuex/index'

const app = createApp(App)
app.use(myVuex)
app.mount('#app')

测试代码

import { useStore } from '../../vuex/myVuex'

const store = useStore()
const storeState = computed(() => store.state)
console.log(storeState.value)
store.commit('setNum', 43)
console.log(storeState.value, '2')

const getInfo = async () => {
  await store.dispatch('getInfo')
  console.log(storeState.value, '2')
}
getInfo()

const num2 = computed(() => store.getters.double)
console.log(num2.value, 'num * 2')