/*
JavaScript Unleashed, Third Edition
by Richard Wagner and R. Allen Wyke
ISBN: 067231763X
Publisher Sams CopyRight 2000
*/<html>
<head>
<script language="JavaScript1.1" type="text/javascript">
<!--
// Add description property to Number objects
Number.prototype.description = null;
// Speed Limit Numbers
slHighway = new Number(65);
slCity = new Number(35);
slSchoolZone = new Number(25);
// Add Descriptions
slHighway.description = "Interstate Highway Speed Limit";
slCity.description = "City Speed Limit";
slSchoolZone.description = "School Zone Speed Limit";
// Subtract num2 from num1 and display the value of the difference
// between the two along with the original number descriptions.
function tellDifference(num1, num2) {
diff = num1 - num2;
document.write("The speed difference between " + num1.description +
" and " + num2.description + " is " + diff); }
//-->
</script>
</head>
<body>
<script language="JavaScript1.1" type="text/javascript">
<!--
// Call function
tellDifference(slHighway, slCity);
//-->
</script>
</body>
</html>
|
