jsx_component.js

var Button = React.createClass({
    getInitialState: function() {
        return {count: 0};
    },

    render: function() {
        return (
            <button type="button" onClick={this.handleClick}>
                {'Clicked ' + this.state.count + ' time(s)'}
            </button>
        );
    },

    handleClick: function() {
        // This will trigger a re-render.
        this.setState({count: this.state.count + 1});
    },
});