在Body中追加 代码：
Private Sub cmdAddPic_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAddPic.Click
Dim el As HtmlElement = web.Document.CreateElement("div")
el.InnerHtml = "<a href=''>test</a>"
el.Id = "id1"
web.Document.Body.AppendChild(el)
el = Nothing
End Sub
在指定的标签里追加 代码
Private Sub cmdAddPic_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAddPic.Click
el = web.Document.CreateElement("div")
el.InnerHtml = "test2"
el.Id = "id2"
web.Document.GetElementById("id1").AppendChild(el)
el = Nothing
End Sub
其实就是先通过GetElementById找到标签，然后再追加到进去
