How to say STOP in js

"No Thank You!!! No Thank You!!! No Thank You!!!"

function cancelEvent(event) {
  event = (event || window.event);
  if (!event) return false;
  if (event.preventDefault) event.preventDefault();
  if (event.stopPropagation) event.stopPropagation();
  event.cancelBubble = true;
  event.returnValue = false;
  return false;
}

 

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