jquery 做一个小的倒计时效果

html

<div id="shop_rec">
    <ul class="cf">
        <li>
            <img src="image/goods.jpg" alt="小米 Note 顶配版" />
            <div>
                <h5>小米 Note 顶配版</h5>
                <p>全网通 香槟金 移动联通<br />双4G手机 双卡双待</p>
                <em>¥2998<i>起</i></em>
                <span class="time" data-starttime="1445982375" data-endtime="1446350400"></span>
            </div>
        </li>
        <li>
            <img src="image/goods.jpg" alt="小米 Note 顶配版" />
            <div>
                <h5>小米 Note 顶配版</h5>
                <p>全网通 香槟金 移动联通<br />双4G手机 双卡双待</p>
                <em>¥2998<i>起</i></em>
                <span class="time" data-starttime="1445912375" data-endtime="1436350400"></span>
            </div>
        </li>
    </ul>
</div>

jquery

$(function(){
    var abj = $("#shop_rec"),
        timeObj = abj.find('.time');
    var starttime = timeObj.data('starttime');

    // 定时器函数
    function actionDo(){
        return setInterval(function(){
            timeObj.each(function(index, el) {
                var t = $(this),
                    surplusTime = t.data('endtime') -starttime;
                if (surplusTime <= 0) {
                    t.html("活动已经开始");
                } else{
                    var year = surplusTime/(24*60*60*365),
                        showYear = parseInt(year),
                        month = (year-showYear)*12,
                        showMonth = parseInt(month),
                        day = (month-showMonth)*30,
                        showDay = parseInt(day),
                        hour = (day-showDay)*24,
                        showHour = parseInt(hour),
                        minute = (hour-showHour)*60,
                        showMinute = parseInt(minute),
                        seconds = (minute-showMinute)*60,
                        showSeconds = parseInt(seconds);
                    t.html("");
                    if (showYear>0) {
                        t.append("<span>"+showYear+"年</span>")
                    };
                    if (showMonth>0) {
                        t.append("<span>"+showMonth+"月</span>")
                    };
                    if (showDay>0) {
                        t.append("<span>"+showDay+"天</span>")
                    };
                    if (showHour>=0) {
                        t.append("<span>"+showHour+"小时</span>")
                    };
                    if (showMinute>=0) {
                        t.append("<span>"+showMinute+"分钟</span>")
                    };
                    if (showSeconds>=0) {
                        t.append("<span>"+showSeconds+"秒</span>")
                    };
                };
            });
            starttime++;
        },1000); // 设定执行或延时时间
    };
    // 执行它
    actionDo();
});

总结

不是特别优秀，但是小的应用完全没有问题。