我不断收到ReactRouterDOM错误，但我正在遵循教程，而我的教授没有收到此错误（视频可能已过时）。
索引.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Routing</title>
<!-- Load Babel -->
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
</head>
<body>
<div id="root"></div> <!--- element we're going to target calling it root-->
<!-- Load React -->
<!-- Note: when deploying, replace "development.js" with "production.min.js". -->
<script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
<script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>
<!-- Load our React component. -->
<script src="index.js" defer type="text/babel"></script>
<script src="home.js" defer type="text/babel"></script>
<script src="about.js" defer type="text/babel"></script>
<script src="products.js" defer type="text/babel"></script>
</body>
</html> …