<iframe>标签自适应高度和宽度

<iframe src="index.html" id="iframepage" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" onLoad="iFrameHeight()"></iframe>

// iFrame 自适应高度
function iFrameHeight() {
var ifm= document.getElementById("iframepage");
var subWeb = document.frames ? document.frames["iframepage"].document : ifm.contentDocument;
if(ifm != null && subWeb != null) {
//alert(subWeb.body.scrollHeight);
document.getElementById("iframeId").style.height=subWeb.body.scrollHeight+"px";
//ifm.height = subWeb.body.scrollHeight;
//ifm.width = subWeb.body.scrollWidth;
}
}