Passing data to event handler in jQuery

The following example, 
1. Binds the click event handler to the button using on function
2. We are passing 3 arguments to the on() function
    a) The name of the event
    b) JSON object that contains data that we want to pass to the event handler
    c) Event handler method name
3. In the event handler method (sayHello), we access the data using event object's data property.

<html>
<head>
    <title></title>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('#btnClickMe').on('click', {
                firstName: 'John',
                lastName: 'Doe'
            }, sayHello);

            $('#btnClickMe').on('click', {
                firstName: 'Mary'
            }, sayHello);

            $('#btnClickMe').on('click', sayHello);

            function sayHello(event) {
                if (event.data == null) {
                    alert('No name provided');
                }
                else {
                    alert('Hello ' + event.data.firstName +
                        (event.data.lastName != null ? ' ' + event.data.lastName : ''));
                }
            }
        });
    </script>
</head>
<body style="font-family:Arial">
    <input id="btnClickMe" type="button" value="Click Me" />
</body>
</html>

Output : 
Hello John Doe
Hello Mary
No name provided 

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