iFrame 自适应高度

 function iFrameHeight(o) { 

            varifm= o;

            varsubWeb = document.frames ? document.frames["iframe0"].document: ifm.contentDocument;

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

                ifm.height =subWeb.body.scrollHeight;

            }

        }

<iframe onload="iFrameHeight(this)"></iframe>