iframe 自适应高度

    <script type="text/javascript">

        function iframeFitHeight() {

            var iframe = document.getElementById("loaderFrame");

            try {

                iframe.height = iframe.contentWindow.document.documentElement.scrollHeight + 100; 

             }

             catch (ex) { }

        }

        window.setInterval("iframeFitHeight()", 200);

    </script>