我遇到了同样的问题，我使用以下脚本行得到了解决方案..

I faced the same issue and I got the solution using the following line of script..

IE.Document.getElementsbyTagName("iframe")(0).contentDocument.getElementsbyTagName("body")(0).innertext

IE.Document.getElementsbyTagName("iframe")(0).contentDocument.getElementsbyTagName("body")(0).innertext