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【React】react项目中的redux使用

news 来源：原创 2024/10/2 4:50:43

1. store目录结构设计

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2. react组件中使用store中的数据——useSelector

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3. react组件中修改store中的数据——useDispatch

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4. 示例

react-basic\src\store\moduels\counterStore.js

import { createSlice } from '@reduxjs/toolkit'const counterStore = createSlice({name: 'counter',// 初始化stateinitialState: {count: 0,},// 修改状态的方法,支持直接修改reducers: {plus(state) {state.count++},minus(state) {state.count--}}
})const { plus, minus } = counterStore.actions
const reducer = counterStore.reducer// 按需导出
export { plus, minus }
// 默认导出
export default reducer

react-basic\src\store\index.js

import { configureStore } from "@reduxjs/toolkit";
import counterReducer from './moduels/counterStore'const store = configureStore({reducer: {counter: counterReducer}
})export default store

react-basic\src\index.js

// 项目的入口文件，从这里开始运行// react必要的核心包
import React from 'react';
import ReactDOM from 'react-dom/client';
import store from './store/index'
import { Provider } from 'react-redux'
// 项目的根组件
import App from './App';// 把根组件渲染到id为root的dom节点上
// react-basic\public\index.html
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<Provider store={store}><App /></Provider>
);

react-basic\src\App.js

import { useSelector, useDispatch } from 'react-redux'
import { plus, minus } from './store/moduels/counterStore';function App() {const { count } = useSelector(state => state.counter)const dispatch = useDispatch()return (<div className="App"><button onClick={()=>dispatch(plus())}>+1</button>{count}<button onClick={()=>dispatch(minus())}>-1</button></div>);
}export default App;

5. 提交action传参

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react-basic\src\store\moduels\counterStore.js

import { createSlice } from '@reduxjs/toolkit'const counterStore = createSlice({name: 'counter',// 初始化stateinitialState: {count: 0,},// 修改状态的方法,支持直接修改reducers: {plus(state) {state.count++},minus(state) {state.count--},addToNum(state, actions) {state.count = actions.payload}}
})const { plus, minus, addToNum } = counterStore.actions
const reducer = counterStore.reducer// 按需导出
export { plus, minus, addToNum }
// 默认导出
export default reducer

react-basic\src\App.js

import { useSelector, useDispatch } from 'react-redux'
import { plus, minus, addToNum } from './store/moduels/counterStore';function App() {const { count } = useSelector(state => state.counter)const dispatch = useDispatch()return (<div className="App"><button onClick={()=>dispatch(plus())}>+1</button>{count}<button onClick={()=>dispatch(minus())}>-1</button><button onClick={() => dispatch(addToNum(10))}>add to 10</button><button onClick={() => dispatch(addToNum(20))}>add to 20</button></div>);
}export default App;