var CountUp = function(target, startVal, endVal, decimals, duration, options) {
    var lastTime = 0;
    var vendors = ['webkit', 'moz', 'ms', 'o'];
    for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame']
    }
    if (!window.requestAnimationFrame) {
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() {
                callback(currTime + timeToCall)
            }, timeToCall);
            lastTime = currTime + timeToCall;
            return id
        }
    }
    if (!window.cancelAnimationFrame) {
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id)
        }
    }
    this.options = {
        useEasing: true,
        useGrouping: true,
        separator: ',',
        decimal: '.'
    };
    for (var key in options) {
        if (options.hasOwnProperty(key)) {
            this.options[key] = options[key]
        }
    }
    if (this.options.separator === '') this.options.useGrouping = false;
    if (!this.options.prefix) this.options.prefix = '';
    if (!this.options.suffix) this.options.suffix = '';
    this.d = (typeof target === 'string') ? document.getElementById(target) : target;
    this.startVal = Number(startVal);
    this.endVal = Number(endVal);
    this.countDown = (this.startVal > this.endVal);
    this.frameVal = this.startVal;
    this.decimals = Math.max(0, decimals || 0);
    this.dec = Math.pow(10, this.decimals);
    this.duration = Number(duration) * 1000 || 2000;
    var self = this;
    this.version = function() {
        return '1.6.0'
    };
    this.printValue = function(value) {
        var result = (!isNaN(value)) ? self.formatNumber(value) : '--';
        if (self.d.tagName == 'INPUT') {
            this.d.value = result
        } else if (self.d.tagName == 'text' || self.d.tagName == 'tspan') {
            this.d.textContent = result
        } else {
            this.d.innerHTML = result
        }
    };
    this.easeOutExpo = function(t, b, c, d) {
        return c * (-Math.pow(2, -10 * t / d) + 1) * 1024 / 1023 + b
    };
    this.count = function(timestamp) {
        if (!self.startTime) self.startTime = timestamp;
        self.timestamp = timestamp;
        var progress = timestamp - self.startTime;
        self.remaining = self.duration - progress;
        if (self.options.useEasing) {
            if (self.countDown) {
                self.frameVal = self.startVal - self.easeOutExpo(progress, 0, self.startVal - self.endVal, self.duration)
            } else {
                self.frameVal = self.easeOutExpo(progress, self.startVal, self.endVal - self.startVal, self.duration)
            }
        } else {
            if (self.countDown) {
                self.frameVal = self.startVal - ((self.startVal - self.endVal) * (progress / self.duration))
            } else {
                self.frameVal = self.startVal + (self.endVal - self.startVal) * (progress / self.duration)
            }
        } if (self.countDown) {
            self.frameVal = (self.frameVal < self.endVal) ? self.endVal : self.frameVal
        } else {
            self.frameVal = (self.frameVal > self.endVal) ? self.endVal : self.frameVal
        }
        self.frameVal = Math.round(self.frameVal * self.dec) / self.dec;
        self.printValue(self.frameVal);
        if (progress < self.duration) {
            self.rAF = requestAnimationFrame(self.count)
        } else {
            if (self.callback) self.callback()
        }
    };
    this.start = function(callback) {
        self.callback = callback;
        self.rAF = requestAnimationFrame(self.count);
        return false
    };
    this.pauseResume = function() {
        if (!self.paused) {
            self.paused = true;
            cancelAnimationFrame(self.rAF)
        } else {
            self.paused = false;
            delete self.startTime;
            self.duration = self.remaining;
            self.startVal = self.frameVal;
            requestAnimationFrame(self.count)
        }
    };
    this.reset = function() {
        self.paused = false;
        delete self.startTime;
        self.startVal = startVal;
        cancelAnimationFrame(self.rAF);
        self.printValue(self.startVal)
    };
    this.update = function(newEndVal) {
        cancelAnimationFrame(self.rAF);
        self.paused = false;
        delete self.startTime;
        self.startVal = self.frameVal;
        self.endVal = Number(newEndVal);
        self.countDown = (self.startVal > self.endVal);
        self.rAF = requestAnimationFrame(self.count)
    };
    this.formatNumber = function(nStr) {
        nStr = nStr.toFixed(self.decimals);
        nStr += '';
        var x, x1, x2, rgx;
        x = nStr.split('.');
        x1 = x[0];
        x2 = x.length > 1 ? self.options.decimal + x[1] : '';
        rgx = /(\d+)(\d{3})/;
        if (self.options.useGrouping) {
            while (rgx.test(x1)) {
                x1 = x1.replace(rgx, '$1' + self.options.separator + '$2')
            }
        }
        return self.options.prefix + x1 + x2 + self.options.suffix
    };
    self.printValue(self.startVal)
};