时分秒 定时器

 时分秒 定时器

<p  class="yh-hope-time"><i id="hour_show">00</i>:<i id="minute_show">00</i>:<i  id="second_show">00</i></p>
<script type = "text/javascript" >
           
var intDiff = parseInt(1800); //倒计时总秒数量
function timer(intDiff) {
var f = window.setInterval(function() {
var //day = 0,
hour = 0 ,
minute = 0,
second = 0; //时间默认值    
if (intDiff > 0) {
　　day = Math.floor(intDiff / (60 * 60 * 24));
　　hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
　　minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
　　second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
}else{ 
　　window.clearInterval(f); 
}
if (minute <= 9) minute = '0' + minute;
if (second <= 9) second = '0' + second;
  　document.getElementById("hour_show").innerText='0'+hour;
　　document.getElementById("minute_show").innerText=minute;
　　document.getElementById("second_show").innerText=second; 
　　intDiff--;
}, 1000);
} 
timer(intDiff);

</script>