code: function renderTouches(touches, element) {
          touches.forEach(function(touch) {
              var el = document.createElement('div');
              el.style.width = '20px';
              el.style.height = '20px';
              el.style.background = 'red';
              el.style.position = 'fixed';
              el.style.top = touch.y +'px';
              el.style.left = touch.x +'px';
              el.style.borderRadius = '100%';
              el.style.border = 'solid 2px #000';
              el.style.zIndex = 6000;
  
              element.appendChild(el);
              setTimeout(function() {
                  el && el.parentNode && el.parentNode.removeChild(el);
                  el = null;
              }, 100);
          });
      }
docs: render the touches
  @param touches
  @param element
  @param type