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【JS】防刷新的倒计时

作者:wzfz / 发布于2015/7/9/ 691


	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
	<title>前端开发</title>
	</head>
	
	<body>
	<SCRIPT LANGUAGE="JavaScript">
	var maxtime;
	if(window.name==''){
	maxtime = 1*60;
	}else{
	maxtime = window.name;
	}
	
	function CountDown(){
	if(maxtime>=0){
	hours = Math.floor(maxtime/3600);
	minutes = Math.floor((maxtime-hours*3600)/60);
	seconds = Math.floor(maxtime%60);
	msg = "距离考试结束还有"+hours+"时"+minutes+"分"+seconds+"秒";
	document.all["timer"].innerHTML = msg;
	if(maxtime == 5*60) alert('注意，还有5分钟!');
	--maxtime;
	window.name = maxtime;
	}
	else{
	clearInterval(timer);
	alert("考试时间到，结束!");
	}
	}
	timer = setInterval("CountDown()",1000);
	</SCRIPT>
	<div id="timer" style="color:red"></div>
	
	</body>
	</html>

试试其它关键字

　防刷新　　倒计时　

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