This is what I use:

/* (A Name Here if you want ;3) */
var code = 'Hello, World!';
alert(code);
/* (An optional Ending sentence.) */

If you don't want a name or ending then just make them both /**/.

And if you want to commentanize it, then just remove the second forward slash:

/**/ <-- This one! :3

/**/

So this would be a comment:

/** <-- '/' missing!
alert(1+2);
/**/

You can also replace the last /**/ with //*/ if you want ;\

I like this a lot because it is toggalable by 1 (one) character, and it also look pretty nice imo. Yeah! ;3