如何使用React Router嵌套某些路由？我想保留一个header组件

npm install react-router-dom

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

render() {
  return (
    <Router>
      {/* 应用的其他组件和路由配置 */}
    </Router>
  );
}

import { Route } from 'react-router-dom';

class ParentComponent extends React.Component {
  render() {
    return (
      <div>
        {/* 父组件的内容 */}
        <Route path="/parent/child" component={ChildComponent} />
      </div>
    );
  }
}

import { Route } from 'react-router-dom';

class ChildComponent extends React.Component {
  render() {
    return (
      <div>
        {/* 子组件的内容 */}
        <Route path="/parent/child/grandchild" component={GrandchildComponent} />
      </div>
    );
  }
}