this.js

/**
 * Module dependencies.
 */

var react = require('react');

/**
 * Define our component.
 */
 
function ourComponent(props) {
 this.render = function() {
  return react.DOM.div(null, 'hello world');
 }
}

/**
 * Render our component.
 */

react.rendercomponent(ourComponent, window.document.body);