redux 2024 (2)react中使用redux

安装

npm install react-redux 
npm install @reduxjs/toolkit react-redux
import {createSlice} from '@reduxjs/toolkit' //使用 createSlice 创建 Redux "切片" reducer
const counterStore = createSlice({
    name:"counter",

    // 初始化state
    initialState:{
        count:0
    },
    // 修改数据的方法 同步的方法
    reducers:{//。通过 createSlice,你可以定义一个状态的初始值(initialState)、一组修改状态的函数(reducers)
        increment(state){
            state.count++
        },
        decrement(state){
            state.count--
        }
    }
})

// 解构出actions
const {increment,decrement} = counterStore.actions //虽然 createSlice 主要是用来定义 reducer 的,但是它也负责生成 actions,因此你会在 createSlice 的返回值中看到 actions 属性。

// 获取reducer
const reducer = counterStore.reducer

// 按需导出actionCreater
export {increment,decrement}

// 默认导出reducer
export default reducer //只允许有一个默认导出
import { configureStore } from "@reduxjs/toolkit"; //configureStore 接受一个名为 reducer 的函数作为命名参数;configureStore 会自动使用良好的默认设置来设置 store
import counterReducer from './modules/counterStore'
configureStore({
    reducer:{
        counter:counterReducer
    }
})
export default store

import { StrictMode } from 'react'
import { createRoot } from 'react-dom/client'
import App from './App.jsx'
import './index.css'
import {Provider} from 'react-redux'
import store from './store/index.js'

createRoot(document.getElementById('root')).render(
  <StrictMode>
    <Provider store={store}>
      <App />
    </Provider>
  </StrictMode>,
)

展示数据

 

修改数据

import {useDispatch,useSelector } from "react-redux";
import {increment,decrement} from './store/modules/counterStore'
function App() {
  const {count} = useSelector(state =>state.counter)
  const dispatch = useDispatch()
  return (
    <>
    <button onClick={()=>dispatch(decrement())}>-</button>
{count}
<button onClick={()=>dispatch(increment())}>+</button>
    </>
  )
}

export default App

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转载自blog.csdn.net/2301_78916954/article/details/142758150