iframe 自适应高度

<iframe id="iframePage" name="iframePage" src="http:www.xxx.com" scrolling="no" height="100%" width="1300" onload="Javascript:setWinHeight()" ></iframe>

function setWinHeight() {
    setInterval(setIframeHeight, 2000);
}

function setIframeHeight(){
    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;
    }
}