通過IFRAME加載非本域名下的頁面時，如果需要寫入cookie信息。IE瀏覽器的安全機制將會阻止，cookie的寫入。這可以通過觀察瀏覽器狀態欄中右下角圖，雙擊打開后類似于下圖。

經測試，FireFox及Chrome沒有問題。
解決辦法：
需要在IFRAME加載的頁面中，按下面的方式，增加header頭。

PHP:

header('P3P:CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');

ASP.NET:

HttpContext.Current.Response.AddHeader("p3p","CP=\"IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT\"");

Django:

response = render_to_response('mytemplate.html')
response["P3P"] = 'CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"'

JSP:

response.addHeader("P3P","CP=\"IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT\"")