倒计时js代码

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>