attime =(time+"").split(" "); 这个（time+""）什么意思啊？
<!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+"").split(" ");
document.getElementById("clock").value = attime[4];
}
setInterval(clock,1000);
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50" />
</form>
</body>
</html>
定时器代码
