Jquery.data数据缓存，存储上传的文件，供保存时一并提交

    <div id="sto">
        <input type="file" onchange="upload(this)" multiple>
    </div>
    <script type="text/javascript">
        function upload(obj) {
            var o = {};
            o["isa"] = true;
            o["desc"] = "这是情况说明";
            o["files"] = obj.files;
            $("#sto").data("myo", o);
            $("#sto").empty();
            var f = $("#sto").data("myo");
            var formData = new FormData();
            formData.append("isa", f.isa);
            formData.append("desc", f.desc);
            for (var i = 0; i < f.files.length; i++) {
                formData.append("upfile", f.files[i]);
            }
            $.ajax({
                url: "/Home/uploadfile",
                type: "POST",
                data: formData,
                cache: false,         //不设置缓存
                processData: false,  // 不处理数据
                contentType: false,   // 不设置内容类型
                success: function (data) {
                    alert("上传了" + data.a + "个文件。");
                }
            });
        }
    </script>

        [HttpPost]
        public ActionResult uploadfile(IEnumerable<HttpPostedFileBase> upfile,bool? isa,string desc)
        {
            return Json(new { a = upfile.Count()});
        }