VB如何调用DOM对象，去提取指定网址的内容？

请看以下示例：
Set http=Server.CreateObject("Microsoft.XMLHTTP")
http.Open "GET","http://localhost/xml.xml",False
http.send

Set xml=Server.CreateObject("Microsoft.XMLDOM")
xml.Async=False
xml.ValidateOnParse=False
xml.Load(http.ResponseXML)
If xml.ReadyState>2 Then
Set item=xml.getElementsByTagName("item")'读取页面上指定区域(指定id,指定class的内容与此同理)
For i=0 To (item.Length-1)
Set title=item.Item(i).getElementsByTagName("title")
Set link=item.Item(i).getElementsByTagName("link")
msgbox "网页链接" & (i+1) & ":" & link.Item(0).Text
Next
Else
msgbox "文档还未准备就绪。状态："& xml.ReadyState & "。"
End If
Set http=Nothing
Set xml=Nothing

Dim oNode As IXMLDOMNode