在子路由之间移动时，防止父路由上的react路由器转换

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

function App() {
  return (
    <div>
      {/* 父路由 */}
      <Switch>
        <Route exact path="/" component={Home} />
        <Route path="/about" component={About} />
        <Route path="/contact" component={Contact} />
      </Switch>
    </div>
  );
}

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

function App() {
  return (
    <div>
      {/* 父路由 */}
      <Route exact path="/" component={Home} />
      <Route exact path="/about" component={About} />
      <Route exact path="/contact" component={Contact} />
    </div>
  );
}