Keyboard: CTRL + SHIFT + J
Menu: Edit -> IntellisSense -> Update JScript IntelliSense
If you find that your IntelliSense isn't showing items for JScript items you recently put in then you can update the JScript Intellisense yourself by going to Edit -> IntellisSense -> Update JScript IntelliSense or pressing CTRL + SHIFT + J:
It goes by pretty fast, but you may even see the "Updating JScript IntelliSense" message in the Status Bar at the lower left-hand corner of your screen:
When it is done, you should be able to see the newly added items in your IntelliSense.