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>