<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<script type="text/javascript">
var c=0
var t
function timedCount()
{
document.getElementById('txt').value=c
c=c+1
t=setTimeout("timedCount()",1000)
}
function stopCount()
{
clearTimeout(t)
}
</script>
</head>
<body>
<form>
<input type="button" value="開(kāi)始計(jì)時(shí)！" onClick="timedCount()">
<input type="text" id="txt">
<input type="button" value="停止計(jì)時(shí)！" onClick="stopCount()">
</form>
<p>請(qǐng)點(diǎn)擊上面的“開(kāi)始計(jì)時(shí)”按鈕來(lái)啟動(dòng)計(jì)時(shí)器。輸入框會(huì)一直進(jìn)行計(jì)時(shí)，從 0 開(kāi)始。點(diǎn)擊“停止計(jì)時(shí)”按鈕可以終止計(jì)時(shí)。</p>
<p>timedCount(),1000ms自己調(diào)自己。</p>
</body>
</html>
