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 <p>{this.sayHello()}
        </p>
    }
})
ReactDOM.render(
     <HelloWorld />
    , document.getElementById('J_contentContainer'))