这是最精简的写法吗？
<script type="text/javascript">
var attime;
function clock(){
var time=new Date();
var miao= time.getSeconds();
miao= miao<10 ? '0'+ miao : miao;
attime= time.getHours()+':'+time.getMinutes()+':'+miao;
document.getElementById("clock").value = attime;
}
window.onload=function(){setInterval("clock()",1000);}
</script>
