React Mixin HelloWorld

import React from 'react';
var ReactDOM = require('react-dom'); 
var HelloWorldMixin = {
    sayHello: function () {
       return "Hello World!"
    }
};

var HelloWorld = React.createClass({
    mixins: [HelloWorldMixin],render: function () {
        return <div>{this.sayHello()}
        </div>
    }
})
ReactDOM.render(
     <HelloWorld />,document.getElementById('J_contentContainer'))