Working with Promt in Javascript

Like Console application in Dot net,we can use the same thing with the help of Prompt in Javascript.Prompt means asking a user to enter something in the input box. 

We can understand it by an example:- 
Make a Javascript function as below:- 

 <script type="text/javascript">
        function prompt_alert() {
            var value = "";
            var name = prompt("Please enter your name", "Nayab");
            if (name != null) {
                value = name;
                alert(value);
            }
        }
    </script>

So,it's easy to understand about Prompt.