JQ日期倒计时代码

<p class="nnqqqgggss">抢购开始时间剩余：<span id="day_show"></span>天<span id="hour_show"></span>小时<span id="minute_show"></span>分钟<span id="second_show"></span>秒</p>
<script>
	//倒计时
		var intDiff = parseInt('<?php echo ($info['qgstime']-time());?>');//倒计时总秒数量
		function timer(intDiff){
			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);
			}
			if (minute <= 9) minute = '0' + minute;
			if (second <= 9) second = '0' + second;
			$('#day_show').html(day);
			$('#hour_show').html(hour);
			$('#minute_show').html(minute);
			$('#second_show').html(second);
			if(intDiff==0) location.href = '<?php echo $_SESSION['dangqian_url'];?>';
			intDiff--;
			}, 1000);
		} 
		$(function(){
			timer(intDiff);
		});   
	//end
</script>