function numroll() { $.fn.countto = function (options) { options = options || {}; 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 var loops = math.ceil(settings.speed / settings.refreshinterval), increment = (settings.to - settings.from) / loops; // references & variables that will change with each update var self = this, $self = $(this), loopcount = 0, value = settings.from, data = $self.data('countto') || {}; $self.data('countto', data); // if an existing interval can be found, clear it first if (data.interval) { clearinterval(data.interval); } data.interval = setinterval(updatetimer, settings.refreshinterval); // initialize the element with the starting value 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: 0, // 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: 100, // 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 // $('.timer').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') || {}); $this.countto(options); } } var flag = false; if($('.timer-scroll').length>1){ var scroll = $('.timer-scroll').offset().top-window.innerheight; } // 触发时间 $(window).scroll(function () { var height = $(window).scrolltop(); if (height >= scroll && false === flag) { flag = true; numroll(); } if (height < scroll) { flag = false; } });