XML DOM 去元素值的问题 - Web 开发 / XML/SOAP

loadxmldoc.js文件内容：

function loadXMLDoc(dname) 
{
try //Internet Explorer
  {
  xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
  }
catch(e)
  {
  try //Firefox, Mozilla, Opera, etc.
  {
  xmlDoc=document.implementation.createDocument("","",null);
  }
  catch(e) {alert(e.message)}
  }
try 
  {
  xmlDoc.async=false;
  xmlDoc.load(dname);
  return(xmlDoc);
  }
catch(e) {alert(e.message)}
return(null);
}


book.xml文件内容：

<?xml version="1.0" encoding="ISO-8859-1" ?> 
<!-- Edited by XMLSpy® --> 
 <bookstore>
 <book category="COOKING">
  <title lang="en">Everyday Italian</title> 
  <author>Giada De Laurentiis</author> 
  <year>2005</year> 
  <price>30.00</price> 
  </book>
  <book category="CHILDREN">
  <title lang="en">Harry Potter</title> 
  <author>J K. Rowling</author> 
  <year>2005</year> 
  <price>29.99</price&g