esnes.js

import NES from '../common/nes.js';
import AnimationContext from '../common/animation.js';

document.addEventListener('DOMContentLoaded', () => {
  const rom = new Blob(['NES', 0x04]);
  const view = document.querySelector('main');
  const canvas = view.querySelector('canvas');
  const animated = new AnimationContext(canvas);
  const nes = NES(rom, {
    Hz: document.forms['nes'].elements['hz'].value
  });

  canvas.addEventListener('click', event => {
    if (!animated.paused) animated.pause();
    else animated.play(ms => nes.emulate(nes.data, ms));
  });
});