Countdown Timer is not showing in javascript -


i new in javascript, want create countdown timer localstorage starts given time , end 00:00:00, it's not working, when running code showing value "1506".

here code

<script type="text/javascript">             if (localstorage.getitem("counter")) {                 var currenttime = localstorage.getitem("counter");             }             else {                 var hour = 3;                 var minute = 25;                 var second = 60;                 var currenttime = hour.tostring() + ":" + minute.tostring() + ":" + second.tostring();             }               function countdown() {                                                 document.getelementbyid('lblduration').innerhtml = currenttime;                 second--;                 if (second == -1) {                     second = 59;                     minute--;                 }                 if (minute == -1) {                     minute = 59;                     hour--;                 }                 localstorage.setitem("counter", currenttime);             }              var interval = setinterval(function () { countdown(); }, 1000);      </script>

when localstorage available don set values hour, minute , second. when countdown function executed finds second undefined , statement second-- converts second nan. fix initialize hour, minute , second variable. 've refactored code little bit hope helps:

function countdown() {      var currenttime =  getcurrenttime();                                printcurrenttime(currenttime)     currenttime.second--;     if (currenttime.second == -1) {         currenttime.second = 59;         currenttime.minute--;     }     if (currenttime.minute == -1) {         currenttime.minute = 59;         currenttime.hour--;     }     setcurrenttime(currenttime); }    function setcurrenttime(newcurrenttime){     if(localstorage) localstorage.setitem("counter", json.stringify(newcurrenttime));     else setcurrenttime.storage = newcurrenttime;   }   function getcurrenttime(){     var result = localstorage ? localstorage.getitem("counter") : setcurrenttime.storage;     result = result || {hour:3, minute:25, second:60};     if (typeof(result) === "string")result = json.parse(result);     result.tostring = function(){         return result.hour +  ":" + result.minute + ":" + result.second;     }     return result;   }   function printcurrenttime(currentime){         var domtag = document.getelementbyid('lblduration');         if(domtag) domtag.innerhtml = currentime.tostring();         else console.log(currentime);   } setinterval(function () { countdown(); }, 1000);

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