store/index.js
// 使用rtk來(lái)創(chuàng)建store
import { configureStore } from '@reduxjs/toolkit'
import useReducer from './userSlice'
/* 
使用rtk的時(shí)候，reducer依然可以使用之前的創(chuàng)建不變
但是不再需要去合并reducer combineReducers
rtk提供了configureStore方法，直接接收一個(gè)對(duì)象作為參數(shù)
可以將reducer的相關(guān)配置直接通過(guò)這個(gè)對(duì)象進(jìn)行傳遞，不再需單獨(dú)合并reducer
reducer屬性可以直接單獨(dú)傳遞一個(gè)ruducer,也可以傳遞一個(gè)對(duì)象
*/
const store = configureStore({
  reducer: {
    user: useReducer
  }
})
export default store

import React from 'react'
import ReactDOM from 'react-dom/client'
import App from './App'
import { Provider } from 'react-redux'
import store from './store'
const root = ReactDOM.createRoot(document.getElementById('root'))
root.render(
  <Provider store={store}>
    <App />
  </Provider>
)

// 切片對(duì)象
import { createSlice } from '@reduxjs/toolkit'
/* 
reducer切片
createSlice函數(shù)的作用：生成分片的reducer
內(nèi)部調(diào)用的市createAction和createReducer 
creatSlice可以幫助我們用更少的代碼去生成配套的reducer和action,而且有很好的維護(hù)性
*/
const userSlice = createSlice({
  name: 'zhangsan', // 標(biāo)識(shí)符，生成actions的時(shí)候要使用，
  // state初始值
  initialState: {
    name: '張三',
    age: 18,
    gender: '男'
  } ,
  // reducer的具體方法，
  reducers: {
    // 指定state的各種操作，直接就可以在對(duì)象中添加方法
    setName(state, action) {
      /* 
      可以通過(guò)不同的方法修來(lái)指定對(duì)state的不同的操作
      state，action 
      可以直接修改state => state 是一個(gè)代理對(duì)象  之前的復(fù)制一份，返回一個(gè)新的對(duì)象
      */
      state.name = action.payload
    },
    setAge(state, action) {
      state.age = action.payload
    }
  }
})
/* 
切片對(duì)象會(huì)自動(dòng)地幫助我們生成action
切片對(duì)象會(huì)根據(jù)我們地reducers方法來(lái)自動(dòng)地創(chuàng)建action對(duì)象，這些action對(duì)象會(huì)保存到切片對(duì)象的actions中
{type:name/函數(shù)名，payload:函數(shù)的參數(shù)}
*/
// 實(shí)際開(kāi)發(fā)中，setName，setAge對(duì)外暴露，
export const { setName, setAge } = userSlice.actions
export default userSlice.reducer

import React from 'react'
import { useSelector, useDispatch } from 'react-redux'
import { setName, setAge } from './store/userSlice'
export default function App() {
  const user = useSelector(state => state.user)
  const dispatch = useDispatch()
  const setNameHandler = () => {
    dispatch(setName('李四'))
  }
  const setAgeHandler = () => {
    dispatch(setAge(20))
  }
  return (
    <div>
      <h1>{user.name}</h1>
      <h1>{user.age}</h1>
      <h1>{user.gender}</h1>
      <button onClick={setNameHandler}>修改name</button>
      <button onClick={setAgeHandler}>修改年齡</button>
    </div>
  )
}