javascript - jQuery unload doesn't work in Chrome -

i wrote web method called on unload event of jquery. running when run through visual studio. deployed in iis. working when execute application in ie , firefox. when run application in chrome, strangely doesn't fire unload event. below have written:

  <script type="text/javascript" language="javascript">     var starttime;      $(window).load(function () {         starttime = new date().gettime();     });      $(window).unload(function () {         var endtime = new date().gettime();         var diff = new date(endtime - starttime);         var path = window.location.pathname.tostring();              $.ajax({                 type: "post",                 url: path + "/loguseractivity",                 data: "{ 'timespent': '" + math.floor(diff / 1000).tostring() + "', 'urlvisited': '" + path + "'}",                 contenttype: "application/json; charset=utf-8",                 datatype: "json",                 success: function () {                 },                 error: function (xhr, status, error) {                 },                 failure: function () {                 }             });     });  </script> 

credit goes @daniel a. white

it not issue jquery unload ajax sync call.

made ajax call sync instead of async, worked on chrome other browsers.

 $.ajax({                 async: false,                 type: "post",                 url: path + "/loguseractivity",                 data: "{ 'timespent': '" + math.floor(diff / 1000).tostring() + "', 'urlvisited': '" + path + "'}",                 contenttype: "application/json; charset=utf-8",                 datatype: "json",                 success: function () {                 },                 error: function (xhr, status, error) {                     var err = eval("(" + xhr.responsetext + ")");                     alert(err.message);                 },                 failure: function () {                 }             });