这种情况是怎么回事，他两种类型的时间交替闪烁
<!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 clock(){
var time=new Date();
attime= time.getHours()+"时"+time.getMinutes()+"分"+time.getSeconds()+"秒";
document.getElementById("clock").value = attime;
}
setInterval(clock,100);
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
</form>
</body>
</html>
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