No example of reaction code

[emran]

It's all right, but it's not on the screen. What's the problem? http://codepen.io/412/pen/GqBBLN

    // App
var App = React.createClass({
  render: function() {
    return (
      <div>
     <Nav />
     <Header />
   </div>
    )
  }
});
// Nav

var Nav = React.createClass({

render: function() {

return (

<ul className="nav nav-pills">

<li role="presentation" className="active"><a href="#">вкладка</a></li>

<li role="presentation"><a href="#">вкладка</a></li>

<li role="presentation"><a href="#">вкладка</a></li>

</ul>

)

}

});
// Header

var Header = React.createClass({

render: function() {

return (

<h1 className="foo">привет</h1>

)

}

});
React.render(<App/>, document.querySelector("#mm"));

[jules]

You. React.render Right.

ReactDOM.render(<App/>, document.querySelector("#mm"));

Then it works. http://codepen.io/anon/pen/xOJaxK

Explanation https://stackoverflow.com/questions/26627665/error-with-basic-react-example-uncaught-typeerror-undefined-is-not-a-function