index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>React Router Apps</title>
</head>
<body>
  <div id="content"></div>
</body>
  <!-- <script src="https://code.jquery.com/jquery-3.1.1.min.js" integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8=" crossorigin="anonymous"></script> -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.min.js"></script>
  <script src="https://unpkg.com/react@15/dist/react.js"></script>
  <script src="https://unpkg.com/react-dom@15/dist/react-dom.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react-router/3.0.0/ReactRouter.js"></script>
  <script type="text/babel" src="router.js"></script>
</html>