如果你不需要处理来自不同域的iframe内容，试试这段代码，它将完全解决问题，它很简单:

<script language="JavaScript">
<!--
function autoResize(id){
    var newheight;
    var newwidth;

    if(document.getElementById){
        newheight=document.getElementById(id).contentWindow.document .body.scrollHeight;
        newwidth=document.getElementById(id).contentWindow.document .body.scrollWidth;
    }

    document.getElementById(id).height= (newheight) + "px";
    document.getElementById(id).width= (newwidth) + "px";
}
//-->
</script>

<iframe src="usagelogs/default.aspx" width="100%" height="200px" id="iframe1" marginheight="0" frameborder="0" onLoad="autoResize('iframe1');"></iframe>

最后，我找到了一些其他的解决方案，从iframe使用窗口发送数据到父网站。postMessage(消息、targetOrigin);。下面我来解释一下我是怎么做到的。

站点A = http://foo.com 站点B = http://bar.com

sitb在网站内部加载

SiteB网站有这条线

window.parent.postMessage("Hello From IFrame", "*"); 

or

window.parent.postMessage("Hello From IFrame", "http://foo.com");

然后site ea有如下代码

// Here "addEventListener" is for standards-compliant web browsers and "attachEvent" is for IE Browsers.
var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
var eventer = window[eventMethod];


var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";

// Listen to message from child IFrame window
eventer(messageEvent, function (e) {
   alert(e.data);
   // Do whatever you want to do with the data got from IFrame in Parent form.
}, false); 

如果你想添加安全连接，你可以在事件输入中使用这个If条件(messageEvent, function (e) {})

if (e.origin == 'http://iframe.example.com') {
    alert(e.data); 
    // Do whatever you want to do with the data got from IFrame in Parent form.
}

对于IE

IFrame内:

 window.parent.postMessage('{"key":"value"}','*');

外:

 eventer(messageEvent, function (e) {
   var data = jQuery.parseJSON(e.data);
   doSomething(data.key);
 }, false);

下面是一个jQuery方法，它通过iframe的src属性在json中添加信息。这是一个演示，调整大小和滚动这个窗口。使用json生成的url如下所示… http://fiddle.jshell.net/zippyskippy/RJN3G/show/ {scrollHeight windowHeight docHeight: 5124: 1019: 571} #

这里是源代码提琴http://jsfiddle.net/zippyskippy/RJN3G/

function updateLocation(){

    var loc = window.location.href;
    window.location.href = loc.replace(/#{.*}#/,"") 
        + "#{docHeight:"+$(document).height() 
        + ",windowHeight:"+$(window).height()
        + ",scrollHeight:"+$(window).scrollTop()
        +"}#";

};

//setInterval(updateLocation,500);

$(window).resize(updateLocation);
$(window).scroll(updateLocation);

这个答案只适用于使用Bootstrap的网站。Bootstrap的响应式嵌入特性完成了这项工作。它是基于内容的宽度(而不是高度)。

<!-- 16:9 aspect ratio -->
<div class="embed-responsive embed-responsive-16by9">
  <iframe class="embed-responsive-item" src="http://www.youtube.com/embed/WsFWhL4Y84Y"></iframe>
</div>

jsfiddle: http://jsfiddle.net/00qggsjj/2/

http://getbootstrap.com/components/#responsive-embed

This is slightly tricky as you have to know when the iframe page has loaded, which is difficuly when you're not in control of its content. Its possible to add an onload handler to the iframe, but I've tried this in the past and it has vastly different behaviour across browsers (not guess who's the most annoying...). You'd probably have to add a function to the iframe page that performs the resize and inject some script into the content that either listens to load events or resize events, which then calls the previous function. I'm thinking add a function to the page since you want to make sure its secure, but I have no idea how easy it will be to do.

如果你不需要处理来自不同域的iframe内容，试试这段代码，它将完全解决问题，它很简单:

<script language="JavaScript">
<!--
function autoResize(id){
    var newheight;
    var newwidth;

    if(document.getElementById){
        newheight=document.getElementById(id).contentWindow.document .body.scrollHeight;
        newwidth=document.getElementById(id).contentWindow.document .body.scrollWidth;
    }

    document.getElementById(id).height= (newheight) + "px";
    document.getElementById(id).width= (newwidth) + "px";
}
//-->
</script>

<iframe src="usagelogs/default.aspx" width="100%" height="200px" id="iframe1" marginheight="0" frameborder="0" onLoad="autoResize('iframe1');"></iframe>