How to get rhythm data without using class attribute? about rythm.js HOT 1 OPEN

/* The custom function signature is
 * @elem: The HTML element target you want to apply your effect to
 * @value: The current pulse ratio (percentage between 0 and 1)
 * @options: The option object user can give as last argument of addRythm function
 */
const animateCanvas = (elem, value, options = {}) => {
   const canvas = elem
   const ctx = canvas.getContext("2d");
   // your custom animation here
   // ctx.fillStyle = 'green';
   // ctx.fillRect(10, 10 + value * 10, 100, 100 + value * 10);
}

/* The reset function signature is
 * @elem: The element to reset
 */
const resetCanvas = elem => {
  // you way of handling the reset when animation stops
  // ctx.fillStyle = 'green';
  // ctx.fillRect(10, 10, 100, 100);
}

addRythm('animate-canvas', { dance: animateCanvas, reset: resetCanvas })