javascript is a programming langauage commonly used in web development. and javascript is a clint-side script langauge,which means the source code is procesed by the clint's web browser rather than on web server.this means javascript function can run after a webpage has loaded without communicating with ther server.
Place of script define
we can use script tag "<script></script>" in head tags and body tags.
Example One
<!DOCTYPE html>
<html>
<head>
<title>Javascript</title>
<script type="text/javacript">
/*******working here*******/
</script>
</head>
<body>
</body>
</html>
Example Two
<!DOCTYPE html>
<html>
<head>
<title>Javascript</title>
</head>
<body>
<script type="text/javacript">
/*******working here*******/
</script>
</body>
</html>
Alert
An alert is a box that pops ups to give user a message. here's code for an alert that displays the message "Hello Pakistan"
alert('Hello pakistan');
Example One
<!DOCTYPE html>
<html>
<head>
<title>Javascript</title>
<script type="text/javacript">
alert("Hello pakistan");
</script>
</head>
<body>
<h1>Hello Pakistan</h1>
</body>
</html>
Example Two
<!DOCTYPE html>
<html>
<head>
<title>Javascript</title>
</head>
<body>
<h1>Hello Pakistan</h1>
<script type="text/javacript">
alert("Hello Pakistan");
</script>
</body>
</html>
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