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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>定时器</title>
<script type="text/javascript">
var num=0;
var i=0;
function clock()
{
document.getElementById("c").value =num;
num=num+1;
i=setTimeout(clock,1000);
}
function stop(){
clearTimeout(i);
}
</script>
</head><body>
<form>
<input type="text" id="c" size="150" />
<input type="button" value='开始计时'onclick="clock()"/>
<input type='button' value='停止计时'onclick='stop()'/>
</form>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>定时器</title>
<script type="text/javascript">
var num=0;
var i=0;
function clock()
{
document.getElementById("c").value =num;
i=num=num+1;
setTimeout(clock,1000);
}
function stop(){
clearTimeout(i);
}
</script>
</head><body>
<form>
<input type="text" id="c" size="150" />
<input type="button" value='开始计时'onclick="clock()"/>
<input type='button' value='停止计时'onclick='stop()'/>
</form>
</body>
</html>
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