asp.net user online exit Update Implementation Code _ practical skills

The main question is how to update the user's online list when you close the browser

The way to spread the internet is to keep the Ajax asynchronous send requests, when no longer request to be able to determine the user has closed the browser

Copy Code code as follows:

var x=0;
function Myrefresh ()
{
var HttpRequest = new ActiveXObject ("Microsoft.XMLHTTP");
Httprequest.open ("Get", "test.aspx", false);
Httprequest.send (NULL);
x + +;
if (x<60)//60 times, that is, the session real expiration time is 30 minutes
{
SetTimeout ("Myrefresh ()", 30*1000); 30 seconds.
}
}
Myrefresh ();

Set in Web.config:
<sessionstate mode= "InProc" timeout= "1" ></sessionState>