<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>计时器</title>
<script>
var hour,minute,second;//时 分 秒
hour=minute=second=0;//初始化
var int;
var millisecond=0;//毫秒
function Reset()//重置
{
window.clearInterval(int);
millisecond=hour=minute=second=0;
document.getElementById('timetext').value='00时00分00秒';
}
function start()//开始
{
int=setInterval(timer,1000);
}
//计时
function timer(){
second++;
if(second>=60){
second=0;
minute=minute+1;
}
if(minute>=60){
minute=0;
hour=hour+1;
}
document.getElementById('timetext').value=hour+'时'+minute+'分'+second+'秒';
}
</script>
</head>
<body>
<div style="text-align: center">
<input type="text" id="timetext" value="00时00分00秒" readonly><br>
<button type="button" onclick="start()">开始</button> <button type="button" onclick="stop()">暂停</button> <button type="button" onclick="Reset()">重置</button>
</div>
</body>
</html>