microsoft.xmldom(一) xml文档遍历js

xml:
<?xml version="1.0" encoding="utf-8" ?>
<library>
 <name>首都图书馆</name>
 <address>朝阳区华威桥南</address>
 <books>
  <book>
   <id>0000</id>
  </book>
  <book>
   <id>0001</id>
   <name>Xml初学</name>
   <publisher>人民出版社</publisher>
   <publishdate>2010-05-0-18</publishdate>
   <fee>100.54</fee>
  </book>
  <book>
   <id>0002</id>
   <name>XSD定义</name>
   <author>子弟</author>
   <publisher>子弟出版社</publisher>
   <publishdate>2010-05-0-18</publishdate>
   <fee>102.54</fee>
  </book>
 </books>
</library>
js:
<script type="text/javascript">
        function loadXMLDoc(dname) {
            var xmlDoc;
            // code for IE
            if (window.ActiveXObject) {
                xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
            }
            // code for Mozilla, Firefox, Opera, etc.
            else if (document.implementation && document.implementation.createDocument) {
                xmlDoc = do