代码示例：（标识：xdom_element_insertbefore）
<html>
<head>
<script type="text/javascript" src="/static/demo/html/js/loadxmldoc.js">
</script>
</head>
<body>
<script type="text/javascript">
//check if the last childnode is an element node
function get_lastchild(n)
{
x=n.lastChild;
while (x.nodeType!=1)
{
x=x.previousSibling;
}
return x;
}
xmlDoc=loadXMLDoc("/static/demo/xdom/books.xml");
x=xmlDoc.getElementsByTagName("book")[0];
newNode=xmlDoc.createElement("publisher");
newText=xmlDoc.createTextNode("Clarkson Potter");
newNode.appendChild(newText);
x.insertBefore(newNode,get_lastchild(x));
x=x.childNodes;
for (i=0;i<x.length;i++)
{
if (x[i].nodeType==1)
{
//Process only element nodes
document.write(x[i].nodeName);
document.write(" - ");
document.write(x[i].childNodes[0].nodeValue);
document.write("<br />");
}
}
</script>
</body>
</html>
