直接写代码
<script type="text/javascript">
window.onload=showtime();
function gettime(){
var date = new Date();
var weekDay = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
var year = date.getFullYear();
var month = date.getMonth()+1;
var day = date.getDate();
var hours=date.getHours();
var minutes=date.getMinutes();
var seconds=date.getSeconds();
var week = weekDay[date.getDay()];
$("#day").html(year+"年"+month+"月"+day+"日      "+week);
$("#time").html(hours+":"+minutes+":"+seconds);
}
function showtime(){
setInterval(function() {
gettime();
}, 1000);
}
</script>