iframe跨域高度自适应

<script type="text/javascript">
    // browser compatibility: get method for event 
    // addEventListener(FF, Webkit, Opera, IE9+) and attachEvent(IE5-8)
    var myEventMethod = 
        window.addEventListener ? "addEventListener" : "attachEvent";
    // create event listener
    var myEventListener = window[myEventMethod];
    // browser compatibility: attach event uses onmessage
    var myEventMessage = 
        myEventMethod == "attachEvent" ? "onmessage" : "message";
    // register callback function on incoming message
    myEventListener(myEventMessage, function (e) {
        // we will get a string (better browser support) and validate
        // if it is an int - set the height of the iframe #my-iframe-id
        if (e.data === parseInt(e.data)) 
            document.getElementById('my-iframe-id').height = e.data + "px";
    }, false);
</script>

<script type="text/javascript">
    // all content including images has been loaded
    window.onload = function() {
        // post our message to the parent
        window.parent.postMessage(
            // get height of the content
            document.body.scrollHeight
            // set target domain
            ,"*"
        )
    };
</script>

原文：http://michilehr.de/resize-iframe-by-its-content-cross-domain/