通过Javascript 创建POST提交, 无页面刷新下载

前端准备：

//Download the template through "POST" request
                    function getTargertContainer() {
                        var $tagertContainer = $("#gridviewContainer");
                        if ($("#gridview_Import_dialog").size()) {
                            $tagertContainer = $("#gridview_Import_dialog").parent();
                        }
                        return $tagertContainer;
                    }
                    function downloadExcelTemplate() {
                        var criteria = $("#gridview").data("kendoGrid").options.temp.criteria;
                        criteria.GetIdCollectionOnlyAndIgnorePagination = true;
                        criteria.withData = true;

                        if ($("#iframeforDownload").size()) {
                            $("#iframeforDownload").remove();
                        }
                        $("