js时间记时 _JavaScript

js时间倒计时
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> js倒计时</TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
 </HEAD>

 <BODY>
	<TABLE>
	<TR>
		<TD>剩余时间</TD>
	</TR>
	<TR>
		<TD>
			<div id="time_1"></div>
			  <script type="text/javascript">
				var left_1 = 360; // 剩余时间，秒为单位
		
				setTime_1();
				function setTime_1() {
				  
				  if (left_1) {
					left_1 --;
					var hour = Math.floor(left_1 / 3600);
					hour = (hour < 10) ? ('0' + hour) : hour;
					var minute = Math.floor((left_1 % 3600) / 60);
					minute = (minute < 10) ? ('0' + minute) : minute;
					var second = (left_1 % 3600) % 60;
					second = (second < 10) ? ('0' + second) : second;

					var time = document.getElementById('time_1');
					time.innerHTML = '还剩<span>' + hour + '</span>小时<span>' + minute + '</span>分<span >' + second + '</span>秒';
				  } else {
					var time = document.getElementById('time_1');
					time.innerHTML = '超出购买时间';
				  }
				}
				window.setInterval(setTime_1, 1000);
			</script>
		</TD>
	</TR>
	<TR>
		<TD>
		 <div id="time_2"></div>
		  <script type="text/javascript">

			var left_2 = 720; // 剩余时间，秒为单位
			setTime_2();
			function setTime_2() {
			
			  if (left_2) {
				left_2 --;
				var hour = Math.floor(left_2 / 3600);
				hour = (hour < 10) ? ('0' + hour) : hour;
				var minute = Math.floor((left_2 % 3600) / 60);
				minute = (minute < 10) ? ('0' + minute) : minute;
				var second = (left_2 % 3600) % 60;
				second = (second < 10) ? ('0' + second) : second;

				var time = document.getElementById('time_2');
				time.innerHTML = '还剩<span>' + hour + '</span>小时<span>' + minute + '</span>分<span >' + second + '</span>秒';
			  } else {
				var time = document.getElementById('time_2');
				time.innerHTML = '超出购买时间';
			  }
			}
			window.setInterval(setTime_2, 1000);
		</script>
		</TD>
	</TR>
	</TABLE>
 </BODY>
</HTML>