js实现数字变化

 $.fn.countTo = function (options) {
 options = options || {};//当options未被初始化，即typeof options = 'undefined'时，执行后面部分即var options = {}来初始化一个对象
 return $(this).each(function () {
 // set options for current element
 var settings = $.extend({}, $.fn.countTo.defaults, {
 from: $(this).data('from'),
 to: $(this).data('to'),
 speed: $(this).data('speed'),
 refreshInterval: $(this).data('refresh-interval'),
 decimals: $(this).data('decimals')
 }, options);
 // how many times to update the value, and how much to increment the value on each update
 //更新值多少次，每次更新值多快
 var loops = Math.ceil(settings.speed / settings.refreshInterval),
 increment = (settings.to - settings.from) / loops;
 // references & variables that will change with each update
 //引用和变量每次更新将改变
 var self = this,//返回html对象
 $self = $(this),//返回返回一个jquery对象
 loopCount = 0,
 value = settings.from,
 data = $self.data('countTo') || {};//获取jauery方法对象
 $self.data('countTo', data);//赋值
 // if an existing interval can be found, clear it first
 //如果存在间隔，则清除它
 if (data.interval) {
 clearInterval(data.interval);
 }
 data.interval = setInterval(updateTimer, settings.refreshInterval);
 // initialize the element with the starting value
 //用开始的值初始化
 render(value);
 function updateTimer() {
 value += increment;
 loopCount++;
 render(value);
 if (typeof(settings.onUpdate) == 'function') {
 settings.onUpdate.call(self, value);
 }
 if (loopCount >= loops) {
 // remove the interval
 $self.removeData('countTo');
 clearInterval(data.interval);
 value = settings.to;
 if (typeof(settings.onComplete) == 'function') {
 settings.onComplete.call(self, value);
 }
 }
 }
 function render(value) {
 var formattedValue = settings.formatter.call(self, value, settings);
 $self.html(formattedValue);
 }
 });
 };
 $.fn.countTo.defaults = {
 from: 200, // the number the element should start at
 to: 0, // the number the element should end at
 speed: 1000, // how long it should take to count between the target numbers
 refreshInterval: 1, // how often the element should be updated
 decimals: 0, // the number of decimal places to show
 formatter: formatter, // handler for formatting the value before rendering
 onUpdate: null, // callback method for every time the element is updated
 onComplete: null // callback method for when the element finishes updating
 };
 function formatter(value, settings) {
 return value.toFixed(settings.decimals);
 }
 // custom formatting example
 $('#count-number').data('countToOptions', {
 formatter: function (value, options) {
 return value.toFixed(options.decimals).replace(/\B(?=(?:\d{3})+(?!\d))/g, ',');
 }
 });
 // start all the timers
 $('.timer').each(count);
 function count(options) {
 var $this = $(this);
 options = $.extend({}, options || {}, $this.data('countToOptions') || {});
 $this.countTo(options);
 }