React路由器，history.push运行后的代码？

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

const Home = () => <h1>Home Page</h1>;
const Dashboard = () => <h1>Dashboard Page</h1>;

const App = () => {
  return (
    <Router>
      <div>
        <nav>
          <ul>
            <li>
              <Link to="/">Home</Link>
            </li>
            <li>
              <Link to="/dashboard">Dashboard</Link>
            </li>
          </ul>
        </nav>

        <Route path="/" exact component={Home} />
        <Route path="/dashboard" component={Dashboard} />
      </div>
    </Router>
  );
};

export default App;