ie8 iframe无刷新上传问题_html/css_WEB-ITnose

<form method="post" target="formtarget" action="~/clue/insertdata" enctype="multipart/form-data">        <input class="easyui-filebox" name="file" data-options="{buttonText:'选择文件'}"><br/>         <input class="btn"  type="button" value="取消" onclick="" />            <input class="btn" type="submit" value="导入" />        </form><iframe id="formtarget" name="formtarget" style="display:none"></iframe>js代码 var ifm = document.getElementById("formtarget");        if (ifm.attachEvent) {            ifm.attachEvent("onload", function () {                var data = $(window.frames["formtarget"].document).find("pre").text();                if (data != null) {                    insertresult(data);                }            });        } else {            ifm.onload = function () {                var data = $(window.frames["formtarget"].document).find("pre").text();                if (data != null) {                    insertresult(data);                }            };        }