在頁面找一個合適的位置新增div標籤，用於顯示時間

<div id="clock"><div>

自定義JavaScript函式 showTime()

<script language="javascript">
function showTime(clock){
    var now=new Date();
    var year=now.getFullYear();
    var month=now.getMonth()+1;
    var date=now.getDate();
    var day=now.getDay();
    var hour=now.getHours();
    var min=now.getMinutes();
    var sec=now.getSeconds();
    var arrWeek=new Array("星期一","星期二","星期三","星期四","星期五","星期六","星期天");
    var week=arrWeek[day];
    var time=year+"年"+month+"月"+date+"日  "+week+"  "+hour+":"+min+":"+sec;
    clock.innerHTML="當前時間："+time;
</script>

 

在頁面載入事件中每隔一秒呼叫一次showTime()函式，實時顯示系統時間

windows.onload=function(){
    windows.setInterval("showTime(clock)",1