[TOC] ## 1.获取元素距离顶部的高度 ~~~ function getOffsetTop(element) { var realHeight = element.offsetTop; var parentNode = element.offsetParent; while (parentNode != null) { realHeight += parentNode.offsetTop; parentNode = parentNode.offsetParent; } return realHeight; } ~~~ ## 2.ownerDocument //获取整个文档的文档节点 ## 3.hasChildNodes() //返回boolean值