code: function unbindEvent(element, type, handler) {
      const events = safeEvent(element, type);
      const items = events.get(handler);
  
      if (!items) {
          return;
      }
  
      forgetHandler(element, type, handler);
  
      util.forEach(items, func => {
          if ('removeEventListener' in element) {
              element.removeEventListener(type, func);
          } else if ('detachEvent' in element) {
              element.detachEvent(`on${type}`, func);
          }
      });
  }
docs: Unbind DOM events
  @param {HTMLElement} element - element to unbind events
  @param {string} type - events name
  @param {function} handler - handler function or context for handler
  method