while문으로 target 얻어오는 방법에서 질문 드립니다

아래처럼 해보세요^^

function doorHandler(e) {
	let targetElem = e.target;
	while (!targetElem.classList.contains('door-body')) {
		targetElem = targetElem.parentNode;

		if (targetElem.nodeName == 'BODY') {
			targetElem = null;
			if (currentItem) inactivate(currentItem);
			return;
		}
	}

	if (currentItem) inactivate(currentItem);

	if (targetElem.classList.contains('door-body')) {
		activate(targetElem.parentNode);
	}
}