React Redux 和 React-router-dom

React Redux和React-router-dom是两个非常流行的前端开发库，它们在构建现代化的单页面应用程序中起着重要的作用。本文将介绍React Redux和React-router-dom的主要功能，并通过一个案例代码来演示它们的使用。

jsx
import React from 'react';
import { BrowserRouter as Router, Switch, Route, Link } from 'react-router-dom';
import { connect, Provider } from 'react-redux';
import { createStore } from 'redux';
// 定义初始状态和reducer
const initialState = {
  count: 0
};
function reducer(state = initialState, action) {
  switch (action.type) {
    case 'INCREMENT':
      return { count: state.count + 1 };
    case 'DECREMENT':
      return { count: state.count - 1 };
    default:
      return state;
  }
}
// 创建store
const store = createStore(reducer);
// 定义组件
const Counter = ({ count, increment, decrement }) => (
  
    
Counter: {count}
    Increment
    Decrement
  
);
// 定义映射函数
const mapStateToProps = state => ({
  count: state.count
});
const mapDispatchToProps = dispatch => ({
  increment: () => dispatch({ type: 'INCREMENT' }),
  decrement: () => dispatch({ type: 'DECREMENT' })
});
// 连接组件与store
const ConnectedCounter = connect(mapStateToProps, mapDispatchToProps)(Counter);
// 渲染应用程序
const App = () => (
  
    
      
      
        
          
        
        
          
Welcome to the homepage!
        
      
    
  
);
export default App;