because I need to load the skey value of QQ, I introduced the login of iframe connecting to QQ in the page, and then after the login is successful, there will be a value of skey under the qq.com of cookice. So how can I get this cookice out?
used:

:document.cookice cookice,
:iframedocument,document.cookice undefined

Baidu has downloaded a lot of information, and it seems that many of them use P3P in the background, so ask whether the cross-domain cookie value can be obtained by using js locally on the customer server