$.messager.progress(); 
    pbHandler = $.ajax({
        url: 'php_script/report/report_trip.php',
        type: 'POST',
        dataType: 'json',
        data: data,
        success: function (objects)
        {
                
        }
       }).always(function () {
           console.log("complete");
           $.messager.progress('close');
      });
alwaays get error:
jquery.easyui.min.js:3925 Uncaught TypeError: Cannot read property 'onClose' of undefined
when twich call ajax, messenger won't closed
Problem Solve
when tile or msg set, problem gone!!!
 $.messager.progress({
            title:'Please waiting',
            msg:'Loading data...'
         });