how to comment in javascript

                                    //This does not effect the code.
var something = "But this does effect the code!";

                                    <script type="text/javascript">
<!--
document.write("I have multi-line comments!");
/*document.write("You can't see this!");
document.write("You can't see this!");
document.write("You can't see this!");
document.write("You can't see this!");
document.write("You can't see this!");
document.write("You can't see this!");
document.write("You can't see this!");*/
//-->
</script>

                                    // single line comment 

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

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

                                    // Javascript comment single line
/* Javascript comment 
	multiline */

/* CSS comment 
	any line */

<!-- HTML comment
 	any line -->