SOURCE

function numberSlide(ele){
    if(!(this instanceof numberSlide)){
        return new numberSlide(ele);
    }
    var self = this;
    this.startNumber = 0;
    this.endNumber = ele.getAttribute('data-num') || 0;
    this.nowNumber = this.startNumber;
    if(this.endNumber == 0){
        ele.innerText = 0;
        return;
    }
    if(this.timer){
        cancelAnimationFrame(this.timer);
    }
    var step = (self.endNumber - self.startNumber) / 80;
    var _run = function(){
        step = step > 0 ? Math.ceil(step) : Math.floor(step);
        if(self.endNumber - self.nowNumber < step){
            self.nowNumber = self.endNumber;
            cancelAnimationFrame(self.timer);
            ele.innerText = self.nowNumber;
        }else{
            self.nowNumber += step;  
            ele.innerText = self.nowNumber;
            self.timer = requestAnimationFrame(_run);
        }
        
    }
    _run();    
}
numberSlide(document.querySelector('.num1'));
numberSlide(document.querySelector('.num2'));

<p data-num="2500" class="num1"></p><p data-num="160.56" class="num2"></p>

p{
	font-size: 30px;
	color: crimson;
}