jq2('#stocks_iframe').load(function(){
var iframe_width = jq2('#stocks_iframe').contents().outerHeight() ; 
jq2('#stocks_iframe').css('height',iframe_width); });

<iframe id='stocks_iframe' style='width:100%;height:0px;' frameborder='0'>

在IE11上试试这个

<iframe name="Stack" src="http://stackoverflow.com/" style='height: 100%; width: 100%;' frameborder="0" scrolling="no" id="iframe">...</iframe>

jQuery的.contents()方法允许我们在DOM树中搜索元素的直接子元素。

jQuery:

$('iframe').height( $('iframe').contents().outerHeight() );

记住，在iframe内的页面主体必须有它的高度

CSS:

body {
  height: auto;
  overflow: auto
}

我想让一个iframe表现得像一个正常的页面(我需要在一个iframe元素内做一个全屏横幅)，所以这是我的脚本:

    (function (window, undefined) {

    var frame,
        lastKnownFrameHeight = 0,
        maxFrameLoadedTries = 5,
        maxResizeCheckTries = 20;

    //Resize iframe on window resize
    addEvent(window, 'resize', resizeFrame);

    var iframeCheckInterval = window.setInterval(function () {
        maxFrameLoadedTries--;
        var frames = document.getElementsByTagName('iframe');
        if (maxFrameLoadedTries == 0 || frames.length) {
            clearInterval(iframeCheckInterval);
            frame = frames[0];
            addEvent(frame, 'load', resizeFrame);
            var resizeCheckInterval = setInterval(function () {
                resizeFrame();
                maxResizeCheckTries--;
                if (maxResizeCheckTries == 0) {
                    clearInterval(resizeCheckInterval);
                }
            }, 1000);
            resizeFrame();
        }
    }, 500);

    function resizeFrame() {
        if (frame) {
            var frameHeight = frame.contentWindow.document.body.scrollHeight;
            if (frameHeight !== lastKnownFrameHeight) {
                lastKnownFrameHeight = frameHeight;

                var viewportWidth = document.documentElement.clientWidth;
                if (document.compatMode && document.compatMode === 'BackCompat') {
                    viewportWidth = document.body.clientWidth;
                }

                frame.setAttribute('width', viewportWidth);
                frame.setAttribute('height', lastKnownFrameHeight);

                frame.style.width = viewportWidth + 'px';
                frame.style.height = frameHeight + 'px';
            }
        }
    }

    //--------------------------------------------------------------
    //  Cross-browser helpers
    //--------------------------------------------------------------

    function addEvent(elem, event, fn) {
        if (elem.addEventListener) {
            elem.addEventListener(event, fn, false);
        } else {
            elem.attachEvent("on" + event, function () {
                return (fn.call(elem, window.event));
            });
        }
    }

})(window);

这些函数是不言自明的，并且有注释来进一步解释它们的目的。

以下是精简版:

<iframe src="hello.html" sandbox="allow-same-origin"
        onload="this.style.height=(this.contentWindow.document.body.scrollHeight+20)+'px';">
</iframe>

hjpotter92的答案在某些情况下足够好，但我发现iframe内容经常在Firefox和IE中被底部剪辑，而在Chrome中很好。

以下工作很好为我和修复剪辑问题。该代码可以在http://www.dyn-web.com/tutorials/iframes/height/上找到。我做了轻微的修改，将onload属性从HTML中删除。把下面的代码放在<iframe> HTML后面和</body>结束标记之前:

<script type="text/javascript">
function getDocHeight(doc) {
    doc = doc || document;
    // stackoverflow.com/questions/1145850/
    var body = doc.body, html = doc.documentElement;
    var height = Math.max( body.scrollHeight, body.offsetHeight, 
        html.clientHeight, html.scrollHeight, html.offsetHeight );
    return height;
}

function setIframeHeight(id) {
    var ifrm = document.getElementById(id);
    var doc = ifrm.contentDocument? ifrm.contentDocument: 
        ifrm.contentWindow.document;
    ifrm.style.visibility = 'hidden';
    ifrm.style.height = "10px"; // reset to minimal height ...
    // IE opt. for bing/msn needs a bit added or scrollbar appears
    ifrm.style.height = getDocHeight( doc ) + 4 + "px";
    ifrm.style.visibility = 'visible';
}

document.getElementById('ifrm').onload = function() { // Adjust the Id accordingly
    setIframeHeight(this.id);
}
</script>

你的iframe HTML:

<iframe id="ifrm" src="some-iframe-content.html"></iframe>

请注意，如果您更喜欢在文档的<head>中包含Javascript，那么您可以恢复到在iframe HTML中使用内联onload属性，就像在dyn-web web页面中一样。