<?xml version="1.0" encoding="gb2312" ?> 
- <root>
- <picture>
  <num>14</num> 
  <name>九号公寓</name> 
  <picpath>200843018431487373.jpg</picpath> 
  </picture>
- <picture>
  <num>15</num> 
  <name>十号公寓</name> 
  <picpath>200843018455087607.jpg</picpath> 
  </picture>
  </root>

    if(xmlHttp.readyState == 4) {
        if(xmlHttp.status == 200) {
            alert(xmlHttp.responseText);//可以得到一个文档，如下面的图1
            var xmlDOM = xmlHttp.responseXML; 
            var pictures = xmlDOM.selectNodes("//picture");
            alert(picture.length);//输出为0
            for(var i = 0;i < pictures.length;i++) 
            { 
                    alert(pictures[i].selectSingleNode('./num').nodeValue;            } 

        }
    }

<?xml version="1.0" encoding="utf-8"?> 
<root>
<picture>
  <num>1</num> 
  <name>henhao</name>
  <picpath>200843018431487373.jpg</picpath> 
  </picture>
<picture>
  <num>15</num> 
  <name>shi</name> 
  <picpath>200843018455087607.jpg</picpath> 
</picture>
</root>

<?xml version="1.0" encoding="utf-8"?>
<!--#include file="conn.asp"-->
<%
session.codepage = 65001
%>
<root>
    <%
    sql="select * from introduce where IntroducePic is not null"
    set rs=server.createobject("adodb.recordset")
    rs.open sql,conn,1,1
    do while not rs.eof
    %>
    <picture>
       <num><%=rs("IntroduceID")%></num>
       <picpath><%=rs("IntroducePic")%></picpath>
    </picture>
    <%
    rs.movenext
    loop
    rs.close
    set rs=nothing
    %>
</root>