Like CSS java script can also be defined as inline, internal and external like CSS.
Inline JavaScript
<html>
<head>
<title>Creativemission research & training center</title>
<style type="text/css">
body{ background:#220133 }
</style>
</head>
<body>
<input type="button" onclick="javascript:alert('Hello! alert() by inline js!');" value="Show alert box" />
</body>
</html>
