iframe自适大小

var iframeHeight = Math.min(window.document.documentElement.scrollHeight, window.document.body.scrollHeight);
 if(iframeHeight <= 300)
 {
  iframeHeight +=300;
 }
 iframeHeight+=10;
 $('#iframeDisplay').height(iframeHeight);
 $("#publishDisplay").height(iframeHeight);