基于javascript实现的购物商城商品倒计时实例

/** * Author: Black_Jay郗 * downCount: 时间转换 倒计时 */(function ($) {  $.fn.downCount = function (options, callback) {    var settings = $.extend({        date: null,        offset: null      }, options);    if (!settings.date) {      $.error('Date is not defined.');    }    if (!Date.parse(settings.date)) {      $.error('Incorrect date format, it should look like this, 12/24/2012 12:00:00.');    }    var container = this;    var currentDate = function () {      var date = new Date();      /*var utc = date.getTime() + (date.getTimezoneOffset() * 60000);      var new_date = new Date(utc + (3600000*settings.offset));*/      return date;    };    function countdown () {      var target_date = new Date(settings.date),        current_date = currentDate();      var difference = target_date - current_date;      if (difference < 0) {        clearInterval(interval);//取消 setInterval() 函数设定的定时执行操作        if (callback && typeof callback === 'function') callback();        return;      }      var _second = 1000,        _minute = _second * 60,        _hour = _minute * 60,        _day = _hour * 24;      var days = Math.floor(difference / _day),        hours = Math.floor(((difference % _day) / _hour) + (days*24)),        minutes = Math.floor((difference % _hour) / _minute),        seconds = Math.floor((difference % _minute) / _second);        days = (String(days).length >= 2) ? days : '0' + days;        hours = (String(hours).length >= 2) ? hours : '0' + hours;        minutes = (String(minutes).length >= 2) ? minutes : '0' + minutes;        seconds = (String(seconds).length >= 2) ? seconds : '0' + seconds;      container.find('.hours').text(hours);      container.find('.minutes').text(minutes);      container.find('.seconds').text(seconds);    };    var interval = setInterval(countdown, 1000);  };})(jQuery);

<!-- 倒计时显示Star --><p class="countdown">  <span class="hours">00</span>:  <span class="minutes">00</span>:  <span class="seconds">00</span></p><!-- 倒计时End -->

$('.countdown').downCount({  date: '11/09/2016 13:45:00',  offset: +10}, function () {  alert('秒杀已结束');});