Using Events in React Js

events.js

class App extends Component {

  constructor(props) {
    super(props);
    this.state = {count: 0};
  }

  handleClick(e) {
    this.setState({count: this.state.count+1});
  }

    render() {
      return <button onClick={this.handleClick.bind(this)}>Click</button>
    }
}

export default App;