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<!DOCTYPE html>
<html>
<head>
<script src="https://fb.me/react-0.14.3.min.js "></script>
<script src="https://fb.me/react-dom-0.14.3.min.js "></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
</head>
<body>

<script type="text/babel">

class App extends React.Component {
constructor() {
super();

this.state = {
data: []
}

this.setStateHandler = this.setStateHandler.bind(this);
}

setStateHandler() {
var item = "Hello world!"
var myArray = this.state.data;
myArray.push(item)
this.setState({data: myArray})
}

render() {
return (
<div>
<button onClick = {this.setStateHandler}>Click</button>
<h2>{this.state.data}</h2>
</div>
);
}
}

ReactDOM.render(
<App/>,
document.getElementById('my-div')
);

</script>

<div id="my-div"></div>

</body>
</html>