导出excel表格不能用ajax

reportExcel:function(){
    var rows = $('#glGrid').datagrid('getSelections');
    var ids = "";
    for (var i = 0; i < rows.length; i++) {
        ids += rows[i].studentNo+",";
    }
    var accountId = $('#accountId').val();
    $.messager.confirm('确认','您确认导出'+  rows.length +'明细吗？',function(r){
        if (r){
            $('#ids').val(ids);
            $('#reportType').val("0");
            var tmpInput=$("<input type='hidden' name='ids'/>");
            tmpInput.attr("value", ids);
            $('#exportform').append(tmpInput);
            $('#exportform').form('submit', {
                ajax:false,
                onSubmit: function(){
                    //rmtHelper.showMask();
                },
                success:function(data){
                    var d = eval('(' + data + ')');
                    rmtHelper.hideMask();
                    rmtHelper.showMsg(d.content);
                    rmtHelper.getCurCurdIst().reloadGrid();
                }
            });
        }
    });
},