- JavaScript was designed to add interactivity to HTML pages
- JavaScript is a scripting language
- A scripting language is a lightweight programming language
- JavaScript is usually embedded directly into HTML pages
- JavaScript is an interpreted language (means that scripts execute without preliminary compilation)
- Everyone can use JavaScript without purchasing a license
JavaScript – Syntax
<html>
<body>
<script type=”text/javascript”>
…
</script>
</body>
</html>
<body>
<script type=”text/javascript”>
…
</script>
</body>
</html>
JavaScript Comments
- Singl Line Comments
- Multiline comments
Single Line Comments Examples:
<html>
<head>
<title>A Simple Page</title>
<script language="javascript">
<!--
// The first alert is below
alert("An alert triggered by JavaScript!");
// Here is the second alert
alert("A second message appears!");
// -->
</script>
</head>
<body>
</body>
</html>
Multiline comments Examples:
<html>
<head>
<title>A Simple Page</title>
<script language="javascript">
<!--
/*
Below two alert() methods are used to
fire up two message boxes - note how the
second one fires after the OK button on the
first has been clicked
*/
alert("An alert triggered by JavaScript!");
alert("A second message appears!");
// -->
</script>
</head>
<body>
</body>
</html>
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