React input text

app.js

/**
 * Created by clarico on 29/04/2015.
 */
var App;
App = React.createClass({
    getInitialState: function () {
        return {
            txt: "the state txt",
            id: 0
        }
    },
    update: function (e) {
        this.setState({txt: e.target.value});
    },
    render: function () {
        return (
            <div>
                <h1>{this.props.txt}</h1>
                <input type="text" onChange={this.update}/>

                <h1>{this.state.txt}</h1>
            </div>
        );
    }
});

React.render(<App txt="Ingrese su nombre"/>, document.body);