var Example = React.createClass({

  getInitialState: function() {

    return {

      clicked: 0

    };

  },

​

  handleClick: function() {

    this.setState({clicked: this.state.clicked + 1});  // 1

    this.setState({clicked: this.state.clicked + 1});  // 2

  },

​

  render: function() {

    console.log('render');

    return <button onClick={this.handleClick}>{this.state.clicked}</button>;

  }

});

​

React.render(<Example />, document.body);