function commonParentNode(oNode1, oNode2) { while(oNode1){ if(oNode1.contains(oNode2)){ return oNode1 }else{ oNode1=oNode1.parentNode } } }
js contains() 判断某个节点是否包含某个节点
原文：https://www.cnblogs.com/junjie99/p/14629619.html
