Best way for simple game-loop in Javascript?

Question

Is there a simple way to make a game loop in JavaScript? something like...

onTimerTick() {
  // update game state
}

Answer 1

Yep. You want setInterval:

function myMainLoop () {
  // do stuff...
}
setInterval(myMainLoop, 30);

Answer 2

Would this do?

setInterval(updateGameState, 1000 / 25);

Where 25 is your desired FPS. You could also put there the amount of milliseconds between frames, which at 25 fps would be 40ms (1000 / 25 = 40).