页面a:

<div>

     <iframe id="iframeIda"   width="100%" align="center"   height="this.height=iframeIda.document.body.scrollHeight"  frameborder="0"                 scrolling="auto" src="页面b"></iframe>

</div>

页面b:

<div>test</div>

<div>

    <iframe id="iframeIdb"   width="100%" align="center"   onload="setWinHeight()"  frameborder="0" scrolling="auto" src="页面c">

    </iframe>

</div>

b页面的js

 <script type="text/javascript">

            $(document).ready(function(){

                $(window).resize(function(){setWinHeight();});

            });

            function setWinHeight() {

                var obj=document.getElementById("iframeIdb");

                var temp=document.body.scrollHeight;

                var temp2=document.documentElement.clientHeight;

                obj.style.height = temp2 + 'px';

                parent.document.getElementsByTagName("iframe")[0].style.height=temp+'px';

            }

        </script>

页面c:就是平时的一个页面，不包含iframe。