window.opener.document.getElementById("mycid").value异常:Permission denied

window.opener.document.getElementById("mycid").value错误:Permission denied
用下列方式返回通过window.open打开的页面的值时，提示JS错误：错误:Permission denied
window.opener.document.getElementById("mycid").value ='12';
谁知道是什么原因

------解决方案--------------------
你是不是js跨域了？http://topic.csdn.net/u/20100108/17/cc5255c6-a956-4ff3-a603-c1d17ef95165.html
------解决方案--------------------
top.document.getElementById("mycid").innerHTML=document.getElementById("mycid").value ='12';