题解 | #dom 节点查找#

通过while循环往一边找

function commonParentNode(oNode1, oNode2) {
	let currentElement = oNode1;
	while (currentElement) {
	  if (currentElement.contains(oNode2)) {
		return currentElement;
	  }
	  currentElement = currentElement.parentNode;
	  if(currentElement === oNode2) {
		return currentElement
	  }
	}
	return null
}