demo/04/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>Hello Component</title>
  <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
  <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
  <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
 
<body>
  <div id="example"></div>
  <script type="text/babel">
    class NotesList extends React.Component {
      render() {
        return (
          <ol>
            { 
              React.Children.map(this.props.children, function(child) {
                  return <li>{ child }</li>;
                }
              )
            }
          </ol>
        );
      }
    }
    ReactDOM.render(
      <NotesList>
        <span>Hello</span>
        <span>World</span>
        <span>React</span>
      </NotesList>,
      document.getElementById('example')
    );

  </script>
</body>

</html>