Memory leak using AJAX + jQuery queries

Question

I repeatedly retrieve a JSON object from the server using AJAX calls. Over time, memory usage in the browser increases (used with Chrome, Safari, Firefox). Using Chrome heap snapshots, I found that timestamp strings are left without links. If I take a sequence of shots, I see that the number of lines is constantly increasing.

$(function() {
    var latestTimestamp = 0;

    function fetchData() {
        $.get("/parameter?format=json&since=" + latestTimestamp, gotData)
    }   

    function gotData(data) {
        latestTimestamp = data['timestamp'];
        setTimeout(fetchData, 250);
    }   

    fetchData();
});

Other notes:

• I am using jQuery 1.7.1. EDIT: just tried with 1.6.2 and 1.4.2, the same problem.
• timestampin the JSON object is actually an integer, not a string. So cumulative rows can be temporary values?
• Removing + latestTimestampfrom an AJAX request stops the leak.
• setTimeout (20 ) . , , 250 , .

Answer 1

[], :

function gotData(data) {
    latestTimestamp = data['timestamp'];
    delete data;
    setTimeout(fetchData, 250);
} 

Answer 2

, jQuery / . AJAX.

4 . , , .Net, SignalR

https://github.com/SignalR/SignalR

http://www.hanselman.com/blog/AsynchronousScalableWebApplicationsWithRealtimePersistentLongrunningConnectionsWithSignalR.aspx

Answer 3

javascript cleartimeout? , .

var abc=null;
function gotData(data) {
latestTimestamp = data['timestamp'];
data=null;
clearTimeout(abc);
abc=setTimeout(fetchData, 250);
}