JavaScript is a scripting language that uses objects. For example, your browser window is an object. We can refer to this object via JavaScript by using "window."
The following is a method (action) of the window object. This method is envoked by using the following code:
window.prompt("Please enter your name.", "");
The prompt reply is saved to a variable by using the following code:
var name ;
name = window.prompt("Please enter your name.", "name")' ;
The first line creates a variable by the name of 'name.' The second line sets 'name' equal to the reply of the prompt.
Here's the code to generate the prompt:
<script language="JavaScript" type="text/javascript">
//Create the variable
var name;
//Ask the user to type in their name
name = window.prompt("Please enter your name.", "");
//Write the name to the document.
window.alert("Welcome to my Web page, " + name + "!");
</script>