react --- 路由

1.　　安装

　　　npm install --save react-router-dom

2.　　引入

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

3.　　引入模块

　　　import Home from ‘./page/Home.js‘;

4.　　实现代码

<Router>
      <div>
        <ul>
          <li>
            <Link to="/">Home</Link>
          </li>
          <li>
            <Link to="/about">About</Link>
          </li>
          <li>
            <Link to="/topics">Topics</Link>
          </li>
        </ul>

        <hr />

        <Route exact path="/" component={Home} />
        <Route path="/about" component={About} />
        <Route path="/topics" component={Topics} />
      </div>
    </Router>