<!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 attime;
function sec(){
var sec = time.getSeconds();
if(sec<10){
sec = "0" + sec;
}
return sec;
}
function clock(){
var time=new Date();
attime = time.getHours()+":"+ time.getMinutes()+":"+sec();
document.getElementById("clock").value = attime;
}
setInterval(clock, 1000);
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
</form>
</body>
</html>
明白了，是我的时间变量定义在函数里面了，导致另外一个函数调用不到时间对象