https://www.mbfte.org/Content/js/jquery.countTo.js

1	$.fn.countTo = function (options) {
2		options = options || {};
3		return $(this).each(function () {
4			// set options for current element
5			var settings = $.extend({}, $.fn.countTo.defaults, {
6				from:            $(this).data('from'),
7				to:              $(this).data('to'),
8				speed:           $(this).data('speed'),
9				refreshInterval: $(this).data('refresh-interval'),
10				decimals:        $(this).data('decimals')
11			}, options);
12			// how many times to update the value, and how much to increment the value on each update
13			var loops = Math.ceil(settings.speed / settings.refreshInterval),
14				increment = (settings.to - settings.from) / loops;
15			// references & variables that will change with each update
16			var self = this,
17				$self = $(this),
18				loopCount = 0,
19				value = settings.from,
20				data = $self.data('countTo') || {};
21			$self.data('countTo', data);
22			// if an existing interval can be found, clear it first
23			if (data.interval) {
24				clearInterval(data.interval);
25			}
26			data.interval = setInterval(updateTimer, settings.refreshInterval);
27			// initialize the element with the starting value
28			render(value);
29			function updateTimer() {
30				value += increment;
31				loopCount++;
32				render(value);

33				if (typeof(settings.onUpdate) == 'function') {
34					settings.onUpdate.call(self, value);
35				}
36				if (loopCount >= loops) {
37					// remove the interval
38					$self.removeData('countTo');
39					clearInterval(data.interval);
40					value = settings.to;
41					if (typeof(settings.onComplete) == 'function') {
42						settings.onComplete.call(self, value);
43					}
44				}
45			}
46			function render(value) {
47				var formattedValue = settings.formatter.call(self, value, settings);
48				$self.text(formattedValue);
49			}
50		});
51	};
52	$.fn.countTo.defaults = {
53		from: 0,               // the number the element should start at
54		to: 0,                 // the number the element should end at
55		speed: 1000,           // how long it should take to count between the target numbers
56		refreshInterval: 100,  // how often the element should be updated
57		decimals: 0,           // the number of decimal places to show
58		formatter: formatter,  // handler for formatting the value before rendering
59		onUpdate: null,        // callback method for every time the element is updated
60		onComplete: null       // callback method for when the element finishes updating
61	};
62	function formatter(value, settings) {
63		return value.toFixed(settings.decimals);
64	}