gistfile1.js

/*
 * Non-clamped setInterval
 * By Devon Govett (idea from sink.js)
 * MIT LICENSE
 */

(function() {
    
    var BlobBuilder = this.BlobBuilder || this.MozBlobBuilder || this.WebKitBlobBuilder,
        URL = this.URL || this.webkitURL,
        Worker = this.Worker;
    
    this.createTimer = function(fn, interval) {
        if (!BlobBuilder || !URL || !Worker)
            return setInterval(fn, interval);

        var bb = new BlobBuilder;
        bb.append("setInterval(function() { postMessage('ping'); }, " + interval + ");");
        var url = URL.createObjectURL(bb.getBlob());
        
        var worker = new Worker(url);
        worker.onmessage = fn;
        worker.url = url;
        
        return worker;
    }

    this.destroyTimer = function(timer) {
        if (timer.terminate) {
            timer.terminate();
            URL.revokeObjectURL(timer.url);
        }
        else {
            clearInterval(timer);
        }
    }
    
})();

This "silently" fails on Firefox 8 and doesn't achieve the wanted result on Opera (it only supports workers from Data URIs). :(

That's why sink.js does it using this: https://gist.github.com/1431080 , feature-testing before using and using the best working alternative (Blob, Data, setInterval).

Oh right, forgot about the Firefox 8 issue, and I didn't bother with the whole dataURL thing since it will still work in Opera, but using regular setInterval. Luckily the Firefox 8 thing is easy to work around, so I'll add that later today probably.