Know and point out to students the limits of Khan Academy’s JavaScript environment, which does not allow some important topics (like variable scoping) to be demonstrated.
When teaching a class, especially outside of a school environment, use sticker badges or free 1-month subscriptions to online code learning sites as giveaways to take the pressure off of students.
Have students learn to make themselves a profile page with pop-ups using JavaScript for an exciting and relatively fast way to get students engaged and programming.