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請(qǐng)幫我看看我的定時(shí)器哪里出錯(cuò)了，感激不盡

<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title>定時(shí)器</title>
<script?type="text/javascript">
??var?attime,h,m,s;
??function?clock(){
????var?time=new?Date();????
????h=time.getHours();
????m=time.getMinutes();
????s=seconds.getSeconds();
????var?week=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
????attime=?h+":"+m+":"+s+":"+week[time.getDay()]?;
????document.getElementById("clock").value?=?attime;
??}
??
???var?int=setInterval(clock,100);
</script>
</head>
<body>
<form>
<input?type="text"?id="clock"?size="50"??/>
</form>
</body>
</html>

還有就是我看了下這位同學(xué)的答案，為什么他的setInterval沒(méi)有寫間隔時(shí)間也可以運(yùn)行，不是說(shuō)必須要寫的嗎？

<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title>定時(shí)器</title>
<script?type="text/javascript">
??var?attime,hh,mm,ss,ww,xx;
??function?clock(){
????var?time=new?Date();?
????hh=time.getHours();
????mm=time.getMinutes();
????ss=time.getSeconds();
????if(mm<10){hh="0"+mm};
????if(hh<10){hh="0"+hh};
????if(ss<10){ss="0"+ss};
????var?week=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"]
????ww=time.getDay()
????xx=week[ww]
????attime=?hh+":"+mm+":"+ss+xx;
????document.getElementById("clock").value?=?attime;
??}
??var?int=setInterval(clock)
</script>
</head>
<body>
<form>
<input?type="text"?id="clock"?size="50"??/>
</form>
</body>
</html>