ajax - 如何获取 Ajax div 内容？

Question

Dim objWshShell,IE,searchStr
Set objWshShell = Wscript.CreateObject("Wscript.Shell")
Set IE = CreateObject("InternetExplorer.Application")
With IE
  .Visible = true
  .Navigate "http://site"
  Do While .Busy
    WScript.Sleep 100
  Loop
.....
.....
End With

如何获取内容，<div id="ajax_div"></div>因为没有在页面源代码中显示代码。