本文介绍了一个使用JavaScript编写的简单程序，该程序能够显示当前的日期和时间，并根据时间的不同问候访客。通过设置页面加载时调用的时间函数，网页可以实时更新时间。
<script>
var week1="";
todayDate= new Date();
dates=todayDate.getDate();
month=todayDate.getMonth()+1;
year=todayDate.getYear();
week=todayDate.getDay();
switch (week)
{
case 0:
week1="星期天"
break;
case 1:
week1="星期一"
break;
case 2:
week1="星期二"
break;
case 3:
week1="星期三"
break;
case 4:
week1="星期四"
break;
case 5:
week1="星期五"
break;
case 6:
week1="星期六"
break;
}
document.write("今天是："+year+"年"+month+"月"+dates+"日"+week1)
function Time(){
if (!document.layers&&!document.all)
return
var Timer=new Date();
var hours=Timer.getHours();
var minutes=Timer.getMinutes();
var seconds=Timer.getSeconds();
var hello="";
if(hours>=12)
{hello="下午好!"}
else
{hello="上午好!"}
if (minutes<=9){ minutes="0"+minutes}
if (seconds<=9){seconds="0"+seconds}
myclock="<font size='4' face='Arial' color=blue><b>"+hours+":"+minutes+":"+seconds+" "+hello+"</b></font>";
clock.innerHTML=myclock;
setTimeout("Time()",1000);
}
</script>
<body onload=Time()>
<span id=clock></span>
</body>
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