function export_excel() {
    var number_row = $('#dg').datagrid('getRows');
    let url = "http://miwork-5680278.minasoft.vn/human_resources/Timekeeping_day/export_excel_a_day";
    $.ajax({
        url : url,
        type : 'post',
        data : {
            'data' : number_row,
        },
        success : function (result){
            window.open(url,'_blank');
        },
        error: function(){
            alert("error when get data");
        }
    })
}