<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>停止计时器</title>
<script type="text/javascript">
//页面加载完成后执行
window.onload=function(){
var today=new Date();
//var date1=new Date("2014/02/14 12:30:00");
//alert(date1);
var year=today.getFullYear();
var month=today.getMonth()+1;
var date=today.getDate();
var hour=today.getHours();
hour=checkTime(hour);
var minute=today.getMinutes();
minute=checkTime(minute);
var second=today.getSeconds();
second=checkTime(second);
var currentTime=year+"年"+month+"月"+date+"日 "+hour+":"+minute+":"+second;
document.getElementById("time").innerHTML=currentTime;
//print();
}
//检查时间，为个位数补0
function checkTime(t){
if(t<10){
t="0"+t;
}
return t;
}
//定时器setTimeout()
var timer;
function print(){
var objP=document.getElementById("itany");
objP.innerHTML+="Hello World!<br/>";
timer=setTimeout("print()",500);
}
//停止计时器
function stopTimer(){
clearTimeout(timer);
}
//定时器setInterval()
function print2(){
var objP=document.getElementById("itany");
objP.innerHTML+="Hello World!<br/>";
}
var timer2;
function startTimer2(){
timer2=setInterval("print2()",1000);
}
function stopTimer2(){
clearInterval(timer2);
}
</script>
</head>
<body>
<div id="time"> </div>
<input type="button" value="启动计时器" onclick="startTimer2()" /> <input type="button" value="停止计时器" onclick="stopTimer2()" />
<p id="itany"></p>
</body>
</html>
原文：http://blog.csdn.net/wangzi11322/article/details/45270695