In React, you listen to an event by specifying everything inline in your JSX itself. More specifically, you specify both the event you are listening for and the event handler that will get called, all inside your markup.

return (

</div>

);

React.createClass({

...

increase: function(e) {

this.setState({

count: this.state.count + 1

});

},

...

});

Because we are dealing with events, your increase function (as the designated event handler) will get access to the event argument. We have set this event argument to be accessed by e

React JS