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如何用 JavaScript 实现计时器倒数功能

最编程 2024-02-23 15:26:30
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<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
			window.onload = function(){
				var oDiv = document.getElementById('div1')
				
				
				function fTiming(){
					var nowTime = new Date()
					
					var futureTime = new Date(2021,8,29,0,0,0)
					var trueTime = parseInt((futureTime - nowTime)/1000)
					
					var tDay = parseInt(trueTime/86400)
					var tHour = parseInt((trueTime%86400) / 3600)
					var tMinute = parseInt(((trueTime % 86400) % 3600) / 60)
					var tSecond = trueTime % 60
					var str = '距离开学还有' + tDay + '天' + tHour + '时' + tMinute + '分' + tSecond +'秒'
					oDiv.innerHTML = str
				}
				
				setInterval(fTiming,1000)
				
			}
		</script>
		<style>
			#div1{
				margin: 0 auto;
				font-size: 30px;
				color: #00FFFF;
				height: 35px;
				width: 500px;
				text-align: center;
				line-height: 35px;
				border: 1px solid #006120;
				background-color: #00619F;
			}
		</style>
	</head>
	<body>
		<div id="div1">
			
		</div>
	</body>
</html>