document.getELementById is not a function?怎么回事？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>計(jì)時(shí)器</title>
</head>
<body>
? <form>
??? <input type="text" id="clock" size="50"? />
??? <input type="button" value="Start" id="start"/>
??? <input type="button" value="Stop" id="stop"/>
? </form>
<script type="text/javascript">
?? ?var attime;
?? ?var ostart=document.getELementById('start');
?? ?var ostop=document.getELementById('stop');
?? ?var timer=null;
?? ?ostart.onclick=function start(){
?? ??? ?clearInterval(timer);
?? ??? ?timer=setInterval(function(){
?? ??? ??? ?var time=new Date();???????? ?
?? ??? ??? ?attime=time.getHours()+":"+?? ?time.getMinutes()+":"+ time.getSeconds();
?? ??? ??? ?document.getElementById("clock").value = attime;
?? ??? ?},1000);
?? ?}
?
?? ?
</script>
</body>
</html>
2016-08-02
document.getElementById('id');你的l大寫了