<!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);
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
<input type="button" value="Stop" onclick="clearInterval(i)" />
</form>
</body>
</html>
var i =setInterval("clock",100);
//这一句改为var i =setInterval(clock,100);或者var i =setInterval("clock()",100);就行了
//你需要注意一下setInterval()的参数格式
代码是正确的可能是浏览器问题,请放到自己的编辑器中试一下