Need help with javascript game development

I'm trying to make a top down sword fighting game in a game engine called ct.js and I want to make it so that when you press E you rotate the sword with your mouse, but when I create a boolean to see whether E is pressed or not it becomes true only when E is pressed and when you release it the boolean goes back to false. I am new to javascript and I tried a lot of things but nothing works https://192168ll.link/