Record Audio Stream from getUserMedia

In recent days, I tried to use javascript to record audio stream. I found that there is no example code which works.

Is there any browser supporting?

Here is my code

navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia ||
                         navigator.mozGetUserMedia || navigator.msGetUserMedia; 

navigator.getUserMedia({ audio: true }, gotStream, null);
function gotStream(stream) {

        msgStream = stream;        
        msgStreamRecorder = stream.record(); // no method record :(
}