<iframe src="index.html" id="iframe" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" onLoad="iFrameHeight()"></iframe>
<script type="text/javascript" language="javascript">
function iFrameHeight() {
var ifm= document.getElementById("iframe");
var subWeb = document.frames ? document.frames["iframe"].document : ifm.contentDocument;//(document.frames检测是否是ie,ie下document.frames["iframe"].document,其他为ifm.contentDocument)
if(ifm != null && subWeb != null) {
ifm.height = subWeb.body.scrollHeight;
ifm.width = subWeb.body.scrollWidth;
}
}
</script>