How to Hide Unwanted Script Using Comment in JavaScript ?

We are using Comment for User Reference.
Comments can be used to hide unwanted data in JavaScript.
Comments can be useful while testing your application.

Hide Your Unwanted Code Like this -

<html>
<head>
<title>Hide scripts using comments.</title>
<script language="javascript" type="text/javascript">
<!--
lines of JavaScript code here
...
//-->
</script>
</head>
<body>