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ReactによるHelloWorld（node.js不要） | itcore 2019年

ソースコード

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="Cache-Control" content="no-cache">
    <title>Hello World</title>
    <script src="https://unpkg.com/react@16/umd/react.development.js" crossorigin></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js" crossorigin></script>
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
  </head>
  <body>
    <div id="root"></div>
  </body>
</html>

<script type="text/babel" defer>
    const root = document.querySelector('#root');
    ReactDOM.render(<Hello />, root);

    function Hello() {
        return <div>Hello World!</div>;
    }
</script>

実行

react-01.html