iframe 自适应高度和宽度

<iframe src="pay/index.aspx" marginheight="0" marginwidth="0" frameborder="0" scrolling="no"
width="100%" height="100%" frameborder="0" id="iframepage" name="iframepage" 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>

注意：Iframe 的src  值不能跨域。