Binding Method using React.createClass

sample.js

var Sample = React.createClass({
  getInitialState() {
    return { message: 'Hello world' };
  },

  print() {
    console.log(this.state.message);
  },

  render() {
    return (
      <input type="button" value="Print" onClick={this.print} />
    );
  }
});