iframe高宽度根据内容自适应

iframe根据内容的高度和宽度适应

<iframe src="https://www.baidu.com" id="iframe" frameborder="0" scrolling="no" 
onload="changeFrameHeight()"></iframe>
        <script type="text/javascript" language="javascript">
            function changeFrameHeight() {
                var ifm = document.getElementById("iframe");
                ifm.height = document.documentElement.clientHeight;
                ifm.width = document.documentElement.clientWidth;
                console.log("高度",document.documentElement.clientHeight);
            }
            window.onresize = function() {
                changeFrameHeight();
            }
        </script>