<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计时器</title>
<script type="text/javascript">
function clock(){
var time=new Date();
document.getElementById("clock").value = time;
}
var i=setInterval("clock()",100);
function stop(){
i=setInterval("clock()",100);
}
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
<input type="button" value="Stop" onclick="clearInterval(i)" />
<input type="button" value="停止" onclick="stop()" />
</form>
</body>
</html>
变量是不是声明重复了？还有就是，已经申明了变量i,stop()方法里应该写clearInterval(i)，方法体写错了
不客气