<iframe src="需要连接的iframe地址" id="iframepage" name="iframepage" frameBorder=0 scrolling=no width="100%" onLoad="iFrameHeight()" ></iframe>

<script type="text/javascript" language="javascript">

function iFrameHeight() {

var ifm= document.getElementById("iframepage");

var subWeb = document.frames ? document.frames["iframepage"].document : ifm.contentDocument;

if(ifm != null && subWeb != null) {

ifm.height = subWeb.body.scrollHeight;

}

}

</script>