在ie6的A页面中嵌入第三方页面B，则B页面中的cookies读写会失效，解决方法是在读写cookies之前声明p3p头：

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""")

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

ColdFusion: