js实现数字递增特效【仿支付宝我的财富】

 <div class="counter col_fourth">  <h2 class="timer count-title" id="count-number" data-to="300" data-speed="1500"></h2>  <p class="count-text ">小月博客</p> </div>

$.fn.countTo = function(a) {  a = a || {};  return $(this).each(function() {   var c = $.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")   }, a);  var h = Math.ceil(c.speed / c.refreshInterval),  i = (c.to - c.from) / h;  var j = this,  f = $(this),  e = 0,  g = c.from,  d = f.data("countTo") || {};  f.data("countTo", d);  if (d.interval) {   clearInterval(d.interval)  }  d.interval = setInterval(k, c.refreshInterval);  b(g);  function k() {   g += i;   e++;   b(g);   if (typeof(c.onUpdate) == "function") {    c.onUpdate.call(j, g)   }   if (e >= h) {    f.removeData("countTo");    clearInterval(d.interval);    g = c.to;    if (typeof(c.onComplete) == "function") {     c.onComplete.call(j, g)    }   }  }  function b(m) {   var l = c.formatter.call(j, m, c);   f.html(l)  } })};$.fn.countTo.defaults = {  from: 0,  to: 0,  speed: 1000,  refreshInterval: 100,  decimals: 0,  formatter: formatter,  onUpdate: null,  onComplete: null};function formatter(b, a) {  return b.toFixed(2)}$("#count-number").data("countToOptions", {  formatter: function(b, a) {   return b.toFixed(2).replace(//B(?=(?:/d{3})+(?!/d))/g, ",")  }});$(".timer").each(count);function count(a) {  var b = $(this);  a = $.extend({},  a || {},  b.data("countToOptions") || {});  b.countTo(a)};