javascript获取iframe文档内容(兼容IE和Firefox)

<script type="text/javascript"> 
function getIframeContent(){  //获取iframe中文档内容
        var doc; 

        if (document.all){//IE 
                doc = document.frames["MyIFrame"].document; 
        }else{//Firefox    
                doc = document.getElementById("MyIFrame").contentDocument; 
        } 

        return doc.body.innerHTML;

} 
</script>