React ルーティングにはいくつかのモードがあります

// 1.import { BrowserRouter as Router } from "react-router-dom";
// 2.import { HashRouter as Router } from "react-router-dom";
 
import React from 'react';
import {
  BrowserRouter as Router,
  // HashRouter as Router  
  Switch,
  Route,
} from "react-router-dom";
import Home from './pages/Home';
import Login from './pages/Login';
import Backend from './pages/Backend';
import Admin from './pages/Admin';
 
 
function App() {
  return (
    <Router>
        <Route path="/login" component={Login}/>
        <Route path="/backend" component={Backend}/>
        <Route path="/admin" component={Admin}/>
        <Route path="/" component={Home}/>
    </Router>
  );
}
 
export default App;

import React, { Component } from 'react';
import { Provider } from './context'
// 该组件下Api提供给子组件使用
class HashRouter extends Component {
  constructor() {
    super()
    this.state = {
      location: {
        pathname: window.location.hash.slice(1) || '/'
      }
    }
  }
  // url路径变化 改变location
  componentDidMount() {
    window.location.hash = window.location.hash || '/'
    window.addEventListener('hashchange', () => {
      this.setState({
        location: {
          ...this.state.location,
          pathname: window.location.hash.slice(1) || '/'
        }
      }, () => console.log(this.state.location))
    })
  }
  render() {
    let value = {
      location: this.state.location
    }
    return (
      <Provider value={value}>
        {
          this.props.children
        }
      </Provider>
    );
  }
}
 
export default HashRouter;

import React, { Component } from 'react';
import { Consumer } from './context'
const { pathToRegexp } = require("path-to-regexp");
class Route extends Component {
  render() {
    return (
      <Consumer>
        {
          state => {
            console.log(state)
            let {path, component: Component} = this.props
            let pathname = state.location.pathname
            let reg = pathToRegexp(path, [], {end: false})
            // 判断当前path是否包含pathname
            if(pathname.match(reg)) {
              return <Component></Component>
            }
            return null
          }
        }
      </Consumer>
    );
  }
}
export default Route;