javascript - calculate the time from opening the tab until closing it -


i traing calculate time when open tab until close used onload , onexit didnot work used onload , counter keep counting nothing appear on output, if 1 have solution please .

<html>     <head>         <script type="text/javascript">             var starttime = new date();        //start clock!             window.onbeforeunload = function ()        //when user leaves page(closes thewindow/tab, clicks link)...             {                 var endtime = new date();        //get current time.                 var timespent = (endtime - starttime);        //find out how long it's been.             }             function timedcount() {                 var c = timespent + 1;                 t = settimeout("timedcount()", 1000);                 alert(c);        //pop window time spent in microseconds.             }          </script>     </head>     <body>     </body> </html>

this should done:

<script type="text/javascript">     var starttime = new date();      window.onbeforeunload = function () {         var endtime = new date();         var timespent = (endtime - starttime);         alert(timespent );     } </script>

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