iframe自动适应高度

1.在head里添加如下的javascript

<script type="text/javascript">
function SetWinHeight(obj)
{
var win=obj;
if (document.getElementById)
{
   if (win && !window.opera)
   {
    if (win.contentDocument && win.contentDocument.body.offsetHeight)

     win.height = win.contentDocument.body.offsetHeight;
    else if(win.Document && win.Document.body.scrollHeight)
     win.height = win.Document.body.scrollHeight;
   }
}
}
</script>

2.然后在IFRAME代码部分插入一句：

<IFRAME onload="Javascript:SetWinHeight(this)">