can't find html5 canvas simple collision code

Hi everyone. I'm trying to learn JS in Animate through simple examples that I can break apart and recreate. The latest noob confusion that I find myself in is that I can't find a simple, two object collision example where 'MC Ball' touches 'MC Box' and then 'MC Box' becomes insivible.

Is there anyone out there who can post something like this? It would be a tremendous help to many of us  beginners.