React入门( 二 ) -- 实现路由跳转react-router-dom

我在前一个博客上面前面快速创建了react的环境
https://mp.csdn.net/mdeditor/80081268
在App.js里面的代码

import React, { Component } from 'react';
import {BrowserRouter as Router, Route, Switch, Link} from "react-router-dom";

import logo from './logo.svg';
import Routes from './routes/routes';
import HomePage from './components/home/index'
import About from './components/about/index'
import Example from './components/example/index'
import Page from './page.js'

import './App.css';

class App extends Component {
  render() {
    return (
        <Router>
          <div className="App">
            <div>
              <div><Link to='/'>首页</Link></div>
              <div><Link to='/about'>关于</Link></div>
              <div><Link to='/example'>列表</Link></div>
            </div>
            <hr/>
            <Route exact path="/" component={HomePage} />
            <Route path="/about" component={About} />
            <Route path="/example" component={Example} />
          </div>
        </Router>
    );
  }
}

export default App;

可以看到里面引用了一个react-router-dom
下载的话 就要使用

yarn add react-router-dom

添加依赖 会在package.json 的dependencies 显示 或者在node_module中也会有此文件夹

我的目录结构

实现出来的效果如下图 ,点击上面的首页, 关于, 主题 底下就会分别显示对应组件中的内容