首先,在你的主页面上必须包含以下这段javascript代码:

<script language="Javascript">
var getFFVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Firefox")).split("/")[1]
//extra height in px to add to iframe in FireFox 1.0+ browsers
var FFextraHeight=getFFVersion>=0.1? 16 : 0

function dyniframesize(iframename) {
   var pTar = null;
   if (document.getElementById){
     pTar = document.getElementById(iframename);
   }
   else{
     eval('pTar = ' + iframename + ';');
   }
   if (pTar && !window.opera){
     //begin resizing iframe
     pTar.style.display="block"
    
     if (pTar.contentDocument && pTar.contentDocument.body.offsetHeight){
       //ns6 syntax
       pTar.height = pTar.contentDocument.body.offsetHeight+FFextraHeight;
     }
     else if (pTar.Document && pTar.Document.body.scrollHeight){
       //ie5+ syntax
       pTar.height = pTar.Document.body.scrollHeight;
     }
   }
}
</script>

然后对于主页面用到iframe的地方添加代码:

<iframe
width=200 height=100></iframe>

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