performance - Javascript update time function causes high CPU -


i have following code using display current date , time, , want updated have setinterval update every second. seems causing page taking 25% of cpu , memory takes keeps climbing longer page up.

is there can improve performance of this?

jquery(function($){     (function update_time(){          var months = ["january", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december"];         var days = ["sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"];          var dt = new date();         var hr = dt.gethours() > 12 ? dt.gethours() - 12 : dt.gethours();         var mi = dt.getminutes() < 10 ? "0" + dt.getminutes() : dt.getminutes();         var sd = dt.getseconds() < 10 ? "0" + dt.getseconds() : dt.getseconds();         var div = dt.getseconds() & 1 ? ":" : " ";          $('.hour').text(hr);         $('.minute').text(mi);         $('.second').text(sd);         $('.day').text(days[dt.getday()]);         $('.month').text(months[dt.getmonth()]);         $('.date').text(dt.getdate());         $('.year').text(dt.getfullyear());          $('.time-divider').text(div);          setinterval(update_time, 1000);     })(); });

use settimeout instead of setinterval.

the comments above have done job explaining why, i'll reiterate.

your current function schedule new setinterval every time called, on top of existing ones. after 5 seconds you'll have 32 intervals running. every second number doubles.

settimeout executes callback function once after set amount of time. after 1 second timeout fire , expire, function execute, , new timeout created. rinse , repeat.

jquery(function($){     (function update_time(){          var months = ["january", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december"];         var days = ["sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"];          var dt = new date();         var hr = dt.gethours() > 12 ? dt.gethours() - 12 : dt.gethours();         var mi = dt.getminutes() < 10 ? "0" + dt.getminutes() : dt.getminutes();         var sd = dt.getseconds() < 10 ? "0" + dt.getseconds() : dt.getseconds();         var div = dt.getseconds() & 1 ? ":" : " ";          $('.hour').text(hr);         $('.minute').text(mi);         $('.second').text(sd);         $('.day').text(days[dt.getday()]);         $('.month').text(months[dt.getmonth()]);         $('.date').text(dt.getdate());         $('.year').text(dt.getfullyear());          $('.time-divider').text(div);          settimeout(update_time, 1000);     })(); });

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