React-Redux Introduction（官网）

官网：https://react-redux.js.org/introduction/getting-started

一、Getting Started

1. 安装 React Redux

yarn add react-redux

2. Provider

React Redux 提供了一个 <Provider> 组件，它能让 app 获得 Redux store

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

3. Hooks

React Redux 提供了一对 React hooks 允许 React 组件和 Redux store 做互动
（这两个 hooks 我都不使用，觉得没必要，增加了心智负担）

useSelector 从 store state 读取值并订阅
useDispatch 返回 store 的 dispatch 方法让你方便 dispatch action

import React from 'react'
import { useSelector, useDispatch } from 'react-redux'
import {
  decrement,
  increment,
  incrementByAmount,
  incrementAsync,
  selectCount,
} from './counterSlice'
import styles from './Counter.module.css'
export function Counter() {
  const count = useSelector(selectCount)
  const dispatch = useDispatch()
  return (
    <div>
      <div className={styles.row}>
        <button
          className={styles.button}
          aria-label="Increment value"
          onClick={() => dispatch(increment())}
        >
          +
        </button>
        <span className={styles.value}>{count}</span>
        <button
          className={styles.button}
          aria-label="Decrement value"
          onClick={() => dispatch(decrement())}
        >
          -
        </button>
      </div>
      {/* omit additional rendering output here */}
    </div>
  )
}

「@浪里淘沙的小法师」