iframe跨域访问

<iframe id="iframeBox"></iframe>
function changeTitle(){
    var ifr = document.getElementById(‘iframeBox‘);
    var targetOrigin = ‘*‘;
    var msg =  {
        srcNE:‘iPCA-1‘,
        dstNE:‘iPCA-2‘};
    ifr.contentWindow.postMessage(msg, targetOrigin);
}

<script type="text/javascript">
 window.addEventListener(‘message‘, function(event){
        alert(event.data.srcNE);   
        alert(event.data.dstNE);    
    }, false);
</script>