父元素
var parentNode = title.parentNode;
var parentElement = title.parentElement;

兄弟元素：
var prevSibling = title.previousSibling;
var nextSibling = title.nextSibling;

子元素：
var children = title.children;
var childrenNode = title.childNodes;

//获取属性
var attr01 = title.querySelector('a').href;
var attr02 = title.querySelector('a').getAttribute('href');