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CORION / MozRepl-RemoteObject-0.40 / t / sync-callbacks.html 
<html>
<head>
<script type="application/javascript;version=1.7"/>
//<![CDATA[
var cbid = 1;
var pendingCallbacks = {};

function postCallback (info,continuation) {
    pendingCallbacks[cbid++] = [info,continuation];
    // setTimeout( yield '...', 500);
    // data = yield 'SUSPEND';
    return data
};

function receiveCallbacks(items) {
    for (var i in items) {
        // var (i,payload) = pendingCallbacks[i];
        // remove the callback
        // now, continue the callback
        // pendingCallbacks[i][1](payload)
    };
};

function gen (m) {
    var curr = 0;
    while (curr < m) {
        yield curr;
        curr++
    };
};

function callGenerator () {
    var i = gen(10);
    var v = i.next();
    while (1) {
        try {
            alert(v);
            v = i.next();
        } catch (StopIteration) {
            // end of our loop
            break
        };
    };
};

callGenerator();
//]]></script>
</head>
<body>
</body>
</html>