Example React

var ClickCounter = React.createClass({
    getInitialState: function() {
        return {clicked: 0};
    },
    click: function() {
        this.setState({clicked: this.state.clicked + 1});
    },
    render: function() {
        return (
            <button onClick={this.click}>
                Clicked: {this.state.clicked}
            </button>
            );
        }
    });

ReactDOM.render(<ClickCounter />, document.getElementById("container"));