how to comment out lines of code js code example

Example 1: how to comment in javascript

/* this is a javascript comment
that is multi lines */
// This is a single line comment

Example 2: comment out in javascript

<script type="text/javascript">
<!--
// This is a single line JavaScript comment

document.write("I have comments in my JavaScript code!");
//document.write("You can't see this!");
//-->
</script>