Edit in JSFiddle

var Hello = React.createClass({
  displayName: 'Hello',
  render: function() {
    return React.createElement("div", null, "Hello ", this.props.name);
  }
});

ReactDOM.render(
  React.createElement(Hello, {name: "React"}),
  document.getElementById('app')
);
<div id="app">
    <!-- This element's contents will be replaced with your component. -->
</div>