class LoginControl extends React.Component {

  constructor(props) {

    super(props);

    this.handleLoginClick = this.handleLoginClick.bind(this);

    this.handleLogoutClick = this.handleLogoutClick.bind(this);

    this.state = {isLoggedIn: false};

  }

render() {

    return (

      <div onClick={this.handleClick.bind(this)}>ES6方式创建的组件</div>

    );

  }

return (

      <button onClick={(e) => this.handleClick(e)}>

        Click me

      </button>

    );