React cdn読み込みサンプル1

<script src="https://unpkg.com/react@latest/dist/react.js"></script>
<script src="https://unpkg.com/react-dom@latest/dist/react-dom.js"></script>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>

<div id="root"></div>

<script type="text/babel">
ReactDOM.render(
  <h1>Hello, world!</h1>,
  document.getElementById('root')
);
</script>