让iframe自动跟着屏幕调整大小

    <script type="text/javascript">
        var resizeTimer = null;
        function doResize() {
            var h = document.documentElement.clientHeight - 220;
            if (h > 0)
                $("#mainframe").css("height", h);
            resizeTimer = null;
        }

        var t = document.documentElement.clientWidth;
        var setHeight = function () {
            if (t != document.documentElement.clientWidth) {
                t = document.documentElement.clientWidth;
                if (resizeTimer == null) {
                    resizeTimer = setTimeout("doResize()", 1000); //控制调用方法的时间间隔
                }
            }
        }

        window.onresize = setHeight;
        doResize();
    </script>