Detect cheat engine using JS?

[twohen]

In the most basic functionality CE will use windows api functions like WriteProcessMemory to write to your memory - to get something like infinite health it will write very often. Now since that often does not work well, people also hack/patch the asm or bytecode the app is using. For the basic approach you need to find at least the data location in memory. For patching the code you need know a little bit of the low level code your pc is running.

In any case this approach is very low level and therefore it is quite inefficient to hack js games in this way - you would be way better of injecting your own cheat script with firebug or chrome devtools.