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<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  <button class="buttonError">Show Golfer: Non-Bind Example</button>
  <button class="buttonGood">Show Golfer: Bind Example</button>
  <script>
     var user = {
            data        :[
                {name:"T. Woods", age:37},
                {name:"P. Mickelson", age:43}
            ],
            clickHandler:function (event) {
                var randomNum = ((Math.random () * 2 | 0) + 1) - 1; // random number between 0 and 1
​
                // This line is printing a random person's name and age from the data array
                console.log (this.data[randomNum].name + " " + this.data[randomNum].age);
            }
​
        }
​
        // Pass the user object's clickHandler method as a callback to the button's click method
        // The button is wrapped inside a jQuery $ wrapper, so it is now a jQuery object
        // And the output will be undefined
        $ (".buttonError").click (user.clickHandler); // undefined
    
    $ (".buttonGood").click (user.clickHandler.bind (user));
  </script>
  
</body>
</html>
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