gistfile1.js

//Trong ES5
var Greeting = React.createClass({
  render: function() {
    return React.createElement("p", null, "Hello, Universe");
  },
});

ReactDOM.render(
  React.createElement(Greeting),
  document.getElementById('greeting-div')
);
//Hoặc trong ES6
class Greeting extends React.Component {
  render() {
    return React.createElement("p", null, "Hello, Universe");
  }
}

ReactDOM.render(
  React.createElement(Greeting),
  document.getElementById('greeting-div')
);