js_react__react-intro/public/scripts/tutorial.js

let CommentList = React.createClass({
  render: function () {
    return (
      <div className="commentList">
        Hello, world! I am a CommentList.
        </div>
    );
  }
});

let CommentForm = React.createClass({
  render: function () {
    return (
      <div className="commentForm">
        Hello, world! I am a CommentForm.
        </div>
    );
  }
});

let CommentBox = React.createClass({
  render: function () {
    return (
      <div className="commentBox">
        <h1>Comments</h1>
        <CommentList />
        <CommentForm />
        </div>
    );
  }
});

ReactDOM.render(
  <CommentBox />,
  document.getElementById("content")
);