iframe自适应宽度高度

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

 1 <script>
 2     function iFrameHeight() {
 3         var ifm = document.getElementById("iframepage");
 4         var subWeb = document.frames ? document.frames["iframepage"].document : ifm.contentDocument;
 5         if (ifm != null && subWeb != null) {
 6             ifm.height = subWeb.body.scrollHeight;
 7             ifm.width = subWeb.body.scrollWidth;
 8         }
 9     }
10 </script>