javascript - Getting data from JSON file value is 'undefined' -

i'm trying values json file, data stored in form of array.. here code:

js:

var initdate = new date("7/9/2013"); var diffdays = 0; var times;  function taqvimsingledate() {     // calculation of dates difference     var currdate = new date();     diffdays = math.floor((currdate.gettime() - initdate.gettime()) / (1000 * 60 * 60 * 24));      $.getjson('alldata.json', function(data) {         if (data != '' || data != undefined) {             var addtohtml = '';             addtohtml += '<td>' +data[diffdays].date_g+ '</td>';             $('#singledate').html(addtohtml);              // display appropriate time according location (01 or 02 etc.)             switch(getcity) {             case '01': $('#sahari').html(data[diffdays].sahar_1);                        times = data[diffdays].sahar_1;                 break;             case '02': $('#sahari').html(data[diffdays].sahar_2);                        times = data[diffdays].sahar_2;                 break;             case '03': $('#sahari').html(data[diffdays].sahar_3);                        times = data[diffdays].sahar_3;                 break;             case '04': $('#sahari').html(data[diffdays].sahar_4);                        times = data[diffdays].sahar_4;                 break;             }         } else {alert("database undefined/empty!");}     }); } alert(times); 

the result of element #sahari correct displayed (according value of getcity), problem times variable undefined , i'm stuck here. how pass value of #sahari correctly times variable?

actually, value stored in times, cannot use @ point in time. available after callback went through sucessfully. call function processing desired variable within callback function , able access times.