iframe 隐藏域下载文件 显示遮罩层

html:

<iframe id="loadFileHide" style="display:none;"></iframe>

javascript:

function download() {
document.getElementById("loadFileHide").src = "/ExampleModule/Hadoop/ExportExcel?monthDate=" + $("#monthDate").val() + "&endMonthDate=" +       $("#endMonthDate").val() + "";
Loading(true, "正在处理要导出的数据...");
loadiframe();
}

function loadiframe() {
$("#loadFileHide").bind({
"readystatechange": function () {
if (this.readyState == 'loading') {
Loading(false);
} else {
meter = setTimeout("loadiframe()", 100);  //循环检测
}
}
});
}