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倒计时js代码精确到时分秒，使用方法：注意 var EndTime= new Date('2013/05/1 10:00:00'); //截止时间 这一句，特别是 '2013/05/1 10:00:00' 这个js日期格式一定要注意，否则在IE6、7下工作计算不正确哦。
js代码如下：
function GetRTime(){var EndTime= new Date('2013/05/1 10:00:00'); //截止时间var NowTime = new Date();var t =EndTime.getTime() - NowTime.getTime();/*var d=Math.floor(t/1000/60/60/24);t-=d*(1000*60*60*24);var h=Math.floor(t/1000/60/60);t-=h*60*60*1000;var m=Math.floor(t/1000/60);t-=m*60*1000;var s=Math.floor(t/1000);*/var d=Math.floor(t/1000/60/60/24);var h=Math.floor(t/1000/60/60%24);var m=Math.floor(t/1000/60%60);var s=Math.floor(t/1000%60);document.getElementById("t_d").innerHTML = d + "天";document.getElementById("t_h").innerHTML = h + "时";document.getElementById("t_m").innerHTML = m + "分";document.getElementById("t_s").innerHTML = s + "秒";}setInterval(GetRTime,1000); 

还要一种好多if

function timeRun(hour,minute,second){var hour = hour,minute = minute,second = second;var timer = setInterval(function(){second--;if (second<0) {second = 60;$(".second").text(second);minute--;if (minute<0) {minute = 60;$(".second").text(minute);hour--;if (hour<0) {$(".second").text("00");//alert("倒计时结束！")clearInterval(timer);}else if (hour<10) {$(".hour").text("0"+hour);}else{$(".hour").text(hour);}}else if (minute<10) {$(".minute").text("0"+minute);}else{$(".minute").text(minute);               };}else if (second<10) {$(".second").text("0"+second);}else{$(".second").text(second);               };},1000)}

 还有一种好像更好

HTML代码：
<div id="times_wrap" class="time_num">距离结束时间：<div class="time_w"><b id="times_d" class="time"> </b>天<b id="times_h" class="time"> </b>时<b id="times_m" class="time"> </b>分<b id="times_s" class="time"> </b>秒</div>
</div>JavaScript代码：
<script type="text/javascript">
setTimeout("show_time()",1000);
var time_wrap = document.getElementByIdx_x("times_wrap");
var time_d = document.getElementByIdx_x("times_d");
var time_h = document.getElementByIdx_x("times_h");
var time_m = document.getElementByIdx_x("times_m");
var time_s = document.getElementByIdx_x("times_s");var time_end = new Date("2012/10/29 08:00:00");  // 设定结束时间
time_end = time_end.getTime();function show_time(){var time_now = new Date();  // 获取当前时间
        time_now = time_now.getTime();var time_distance = time_end - time_now;  // 结束时间减去当前时间var int_day, int_hour, int_minute, int_second;if(time_distance >= 0){// 天时分秒换算
        int_day = Math.floor(time_distance/86400000)
        time_distance -= int_day * 86400000;int_hour = Math.floor(time_distance/3600000)
        time_distance -= int_hour * 3600000;int_minute = Math.floor(time_distance/60000)
        time_distance -= int_minute * 60000;int_second = Math.floor(time_distance/1000)// 时分秒为单数时、前面加零站位if(int_hour < 10)int_hour = "0" + int_hour;if(int_minute < 10)int_minute = "0" + int_minute;if(int_second < 10)int_second = "0" + int_second;// 显示时间
        time_d.innerHTML = int_day;time_h.innerHTML = int_hour;time_m.innerHTML = int_minute;time_s.innerHTML = int_second;setTimeout("show_time()",1000);}else{time_d.innerHTML = time_d.innerHTML;time_h.innerHTML = time_h.innerHTML;time_m.innerHTML = time_m.innerHTML;time_s.innerHTML = time_s.innerHTML;// clearTimeout(timerID)
    }
};
</script>