(More) accurate timers for javascript.

AccTimers.js

(function(window){
    window.performance = window.performance || {};
    performance.now = performance.now || function(){
        return +new Date();
    };

    function AccurateInterval(options){
        this.startTime = 0;
        this.elapsed = 0;
        this.timeout = 0;
        this.interval = options.interval || 100;
        this.callback = options.callback;

        if (typeof this.callback !== 'function') throw 'You must specify a callback function.';

        return this;
    }

    AccurateInterval.prototype.start = function(){
        this.startTime = performance.now();
        this.timeout = window.setTimeout(this.tick.bind(this), this.interval);

        return this;
    };

    AccurateInterval.prototype.tick = function(){
        this.elapsed += this.interval;
        var missedTicks = 0,
            nextInterval = this.interval - ((performance.now() - this.startTime) - this.elapsed);

        if (nextInterval <= 0) {
            missedTicks = (Math.abs(nextInterval) / this.interval) | 0;
            this.elapsed += missedTicks * this.interval;
            this.tick();
            return;
        }
        this.callback();
        this.timeout = window.setTimeout(this.tick.bind(this), nextInterval);
    };

    AccurateInterval.prototype.stop = function(){
        window.clearTimeout(this.timeout);

        return this;
    };

    window.setAccurateInterval = function(callback, interval){
        return new AccurateInterval({callback:callback, interval:interval}).start();
    };

    window.clearAccurateInterval = function(acc){
        acc.stop();
    };
})(window);