跨源通信

window.postMessage("Hello","portal.**.com");

//发信息给Iframe

document.getElementsByTagName("ifram")[0].contentWindow.postMessage("Hello","portal.**.com");

监听消息事件

var originWhiteList = ["www.***.com","www.***.net"];
function checkWhiteList(origin)
{
    for(var i=0;i<originWhiteList.length;i++)
    {
        if(orgin == originWhiteList[i])
        {
            return true;
        }
    }
    return false;
}
function messageHandle(e){
    if(checkWhiteList(e.origin))
    {
        processMessage(e.data);
    }    
    else{
        //忽略消息
    }
}
window.addEventListener("message",messageHandle,true);