how can i right in javascript comment code example

Example 1: comment in javascript

// single line comment 

/* multiline comemnt 
line 2
line 3
line 4 */

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>