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<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="ߪʼ݆ʱá" onClick="timedCount()">
<input type="text" id="txt">
<input type="button" value="ֹ݆ͣʱá" onClick="stopCount()">
</form>
<p>ȫ֣ܷʏĦքpߪʼ݆ʱqдť4Ǵ݆֯ʱǷcˤɫ࠲ܡһֱѐ݆ʱìՓ 0 ߪʼc֣ܷpֹ݆ͣʱqдťࠉӔוֹ݆ʱc</p>
<p>timedCount(),1000msַؔܺؔܺc</p>
</body>
</html>