题解 | #dom 节点查找#

使用DOM中Node接口的parentNode指针获取父节点，思路同LC236

function commonParentNode(oNode1, oNode2) {
    let set = new Set();
    let tmp  = oNode1;
    while(tmp) {
        set.add(tmp);
        tmp = tmp.parentNode;
    }
    let res = oNode2;
    while(res) {
        if(set.has(res)) return res;
        else res = res.parentNode;
    }
}