These Demos are based, in part, on material from Felke-Morris's Web Development & Design Foundations with XHTML

Example 1
<h1> Let's get started. </h1>
<script type="text/javascript">
<!-- <![CDATA[
alert("Welcome to JavaScript");
// ]]> -->
</script>
<h1> That's enough for now. </h1>


Example 2
document.write("<h2> 'document.write' Demo </h2>");
document.write("<p> This example show we can include XHTML tags. </p>");
document.write("<p> We can also call functions. </p>");
document.write(document.lastModified);


Example 3
<p>
<a href="#" onmouseover="alert('You moused over');">
	Mouseover Demo</a> </p>
<p>
<a href="#" onmouseout="alert('You moused out');">
	Mouseout Demo</a></p>


Example 4
var userName1, userName2;
userName1 = "Joe";
userName2 = prompt("Please enter your name: ");
document.write("<h2> Hello " + userName2 + ". Welcome to my class. --- " 
   + userName1 + "<h2>");


Example 5
var userName, userColor;
userName = prompt("Please enter your name: ");
document.write("<h2> Hello " + userName + ". <h2>");
userColor = prompt("Hello " + userName + ". What is your favorite color? ");
document.bgColor = userColor;


Example 6
var userName, userColor;
userName = prompt("Please enter your name: ");
document.write("<h2> Hello " + userName + ". <h2>");
userColor = prompt("Hello " + userName + ". What is your favorite color? ");
if (userColor == "green")
{
	document.write("Green is my favorite color too!");
} else 
{
	document.write(userColor + 
	" is a nice color, but it isn't my favorite.");
}


Example 7
function showAlerts()
{
alert("Click OK for a funny joke.");
alert("Click OK to continue.");
alert("Are you sure?");
alert("Are you really sure?");
alert("Okay.  All your files have been deleted.");
}
showAlerts();


Example 8
var direction, inValue, outValue;

direction = prompt("Enter an 'F' or 'C' (without the quotes).");

if (direction == 'F' || direction == 'f')
{	inValue = prompt("Enter the temperature in Celsius: ");
	outValue = 9.0/5.0 * inValue + 32
	document.write("The equivalent Fahrenheit temperature is: ", outValue);
}
if (direction == 'C' || direction == 'c')
{	inValue = prompt("Enter the temperature in Fahrenheit: ");
	outValue = 5.0/9.0 * (inValue - 32.0)
	document.write("The equivalent Celsius temperature is: ", outValue);
}


Example 9
// This is a comment.  It is ignored by the computer
// Comments are used to describe code to people that might be looking at it.

// First, we want to set aside some spots in memory to hold information.
// We'll call those storage areas "firstNumber", "secondNumber" and "sum"
var firstNumber, secondNumber, sum;

// Next we'll ask the user to supply us with two of those numbers.
// Notice that we are putting the values in the storage areas we created
// in the last step.
firstNumber = prompt("Enter a number: ");
secondNumber = prompt("Enter a second number: ");

// Now we will do some math.  The "Number()" business makes sure
// the computer treats the entered values as numbers and not text.
sum = Number(firstNumber) + Number(secondNumber);

// Finally, we'll write out or display a label ("The sum is: ") and 
// the answer (sum).
document.write("The sum is: " + sum);