simple-react.jsx

var Navbar = React.createClass({
    render: function () {
        return (
            <div>
                This is navbar
            </div>
        );
    }
});

var Content = React.createClass({
    render: function () {
        return (
            <div>
                This is content: {this.props.text}
            </div>
        );
    }
});

var App = React.createClass({
    render: function () {
        return (
            <div>
                <Navbar />
                <Content text="Hello" />
            </div>
        );
    }
});

ReactDOM.render(<App />, document.getElementById('app'));