How to get a reference of the content window of the parent window from an iframe, when the parent is cross domain

Question

我需要使iframe可以向它发送一个postMessage。

Answer 1

Because of same origin policy, you have no means to know what is happening is the X-domain child frame. Vice-Versa you have no means to send information up.
However if the other domain is friend of yours, you can establish a communication via the cookies. see also on SO

Answer 2

@Millebi you can do this using following work around.

     <iframe id="frmInner" src="http://www.yahoo.com" height="200" width="200" onload="javascript:$.getScript('Scripts/crossdomain.js',function(){ SomeFunction("someparam"); });">
</iframe>

Where frminner is the frame that displays yahoo page in your site and when loaded completely it calls for a javascript file in you domain ie crossdomain.js , the JS file has SomeFunction() already defined in it which is called with parameter "someparam". Hope this is what you want.