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【React】Redux-toolkit 处理异步操作

article 2025/1/17 19:50:15

安装

npm install @reduxjs/toolkit react-redux

创建 store

src\store\index.js

import { configureStore } from '@reduxjs/toolkit';
import homeReducer from './modules/home';

const store = configureStore({
  reducer: {
    home: homeReducer,
  },
});

export default store;

创建 Reducer

src\store\modules\home.js

import { getHomeGoodPriceData } from '@/services'
import { createSlice, createAsyncThunk } from '@reduxjs/toolkit'

// 定义异步操作，用于获取首页商品价格信息
export const fetchHomeDataAction = createAsyncThunk('fetchdata', async (payload) => {
  const res = await getHomeGoodPriceData()
  return res
})

// 创建 Redux slice，管理首页相关的状态
const homeSlice = createSlice({
  name: 'home',
  // 定义初始状态，包含商品价格信息
  initialState: {
    goodPriceInfo: {},
  },
  // reducers 里面包裹的是同步的方法
  reducers: {
    // 定义 reducer，用于更新商品价格信息
    changeGoodPriceInfoAction(state, { payload }) {
      state.goodPriceInfo = payload
    },
  },
  // 处理异步操作结果，更新状态
  // 我们在extraReducers中放入的是异步的方法，我们在action中声明的方法可以在此处使用
  // 在此处我们可以监听创建好的异步action，此处有三个取值是比较常用的
  // 1、fulfilled 成功之后需要做的操作
  // 2、pending 加载时需要做的操作
  // 3、rejected失败后需要做什么处理
  extraReducers: (builder) => {
    builder.addCase(fetchHomeDataAction.fulfilled, (state, { payload }) => {
      state.goodPriceInfo = payload
    })
  },
})

// 导出 reducer，供 Redux store 使用
export const { changeGoodPriceInfoAction } = homeSlice.actions
export default homeSlice.reducer

对以上builder的解释：此重载接受一个回调函数，该函数接收一个builder对象作为其参数。该构建器提供addCase,addMatcher和addDefaultCase函数，可以调用这些函数来定义此 reducer 将处理的操作。（详情建议官网查）

注入 store

src\index.js

Provider 是React Redux中非常重要的组件,它的主要作用是向整个React应用程序树提供Redux.store。

import { Provider } from 'react-redux'

import React, { Suspense } from 'react'
import ReactDOM from 'react-dom/client'
import { HashRouter } from 'react-router-dom'
import { Provider } from 'react-redux'
import { ThemeProvider } from 'styled-components'

import App from '@/App'
import './assets/css/index.less'
import 'normalize.css'
import store from './store'
import theme from './assets/theme'

const root = ReactDOM.createRoot(document.getElementById('root'))
root.render(
  <Suspense fallback='loading'>
    <Provider store={store}>
      <ThemeProvider theme={theme}>
        <HashRouter>
          <App />
        </HashRouter>
      </ThemeProvider>
    </Provider>
  </Suspense>,
)

使用 store

import React, { memo, useEffect } from 'react'
import { shallowEqual, useDispatch, useSelector } from 'react-redux'

import { fetchHomeDataAction } from '@/store/modules/home'
import { HomeWrapper } from './style'
import HomeBanner from './components/home-banner'
import SectionHeader from '@/components/section-header'
import SectionRooms from '@/components/section-rooms'

const Home = memo(() => {
  /** 从redux中获取数据 */
  const { goodPriceInfo } = useSelector(
    (state) => ({
      goodPriceInfo: state.home.goodPriceInfo,
    }),
    shallowEqual,
  )
  /** 派发异步的事件: 发送网络请求 */
  const dispatch = useDispatch()
  useEffect(() => {
    dispatch(fetchHomeDataAction('xxxx'))
  }, [dispatch])

  return (
    <HomeWrapper>
      <HomeBanner />
      <div className='content'>
        <div className='good-price'>
          <SectionHeader title={goodPriceInfo.title} />
          <SectionRooms roomList={goodPriceInfo.list} />
        </div>
      </div>
    </HomeWrapper>
  )
})

export default Home