jquery에서 iframe 적응형 높이 및 너비를 구현하는 방법

‍<iframe src="index.php" id="mainiframe" name="mainiframe" width="100%" frameborder="0" scrolling="no" marginwidth="0" marginheight="0"></iframe>

<script language="javascript" type="text/javascript"> 
$(document).ready(function(){ 
$("#mainframe").load(function(){ 
$(this).height(0); //用于每次刷新时控制IFRAME高度初始化 
var height = $(this).contents().height() + 10; 
$(this).height( height < 500 ? 500 : height ); 
}); 
}); 
</script>

<script language="javascript"> 
if (window.parent.length>0){window.parent.document.all.mainframe.style.height=document.body.scrollHeight;} 
</script>

<iframe name="web" width="100%" frameborder=0 height="100%" src="index.php" id="web" onload="this.height=web.document.body.scrollHeight+20" ></iframe>