<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>jQuery动态数字翻滚计数到指定数字的文字特效代码</title> </head> <body> <p class="timer count-title" id="count-number" data-to="68" data-speed="1500"></p> <script src='http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js'></script> <script src="js/index.js"></script> </body> </html>
网上找的插件。
js代码：
$.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 $('#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); }