Js之appendChild() insertBefore() 和扩展的 insertAfter()
JavaScript之appendChild、insertBefore和insertAfter:
http://www.cnblogs.com/samlin/archive/2009/03/28/JavaScript-appendChild-insertBefore-insertAfter.html


使用prototype来扩展HTML节点元素的insertAfter()（注：ie下不适用,会报 HTMLElement(或Node)未定义）:
http://snippets.dzone.com/posts/show/5179

// 一 扩展HTMLElement的prototypeHTMLElement.prototype.insertAfter = function(newNode, refNode) {        if(refNode.nextSibling) {            return this.insertBefore(newNode, refNode.nextSibling);        } else {            return this.appendChild(newNode);        }    }// 二 扩展Node的prototypeNode.prototype.insertAfter = function(newNode, refNode) {if(refNode.nextSibling) {return this.insertBefore(newNode, refNode.nextSibling);} else {return this.appendChild(newNode);}}