方法一：可显示日期、上午下午、时间秒针动态实时变化
1.JS部分放到<head></head>区间
<script language="javascript">
var t = null;
t = setTimeout(time,1000);//开始执行
function time()
{
clearTimeout(t);//清除定时器
dt = new Date();
var y=dt.getYear()+1900;
var mm=dt.getMonth()+1;
var d=dt.getDate();
var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var day=dt.getDay();
var h=dt.getHours();
var m=dt.getMinutes();
var s=dt.getSeconds();
if(h<10){h="0"+h;}
if(m<10){m="0"+m;}
if(s<10){s="0"+s;}
if(h<12){ document.getElementById("timeShow").innerHTML = "你好，上午好！今天是"+y+"年"+mm+"月"+d+"日"+h+":"+m+":"+s+"";}
if(h>= 12){ document.getElementById("timeShow").innerHTML = "你好，下午好！今天是"+y+"年"+mm+"月"+d+"日"+h+":"+m+":"+s+"";}
if(h>= 20){ document.getElementById("timeShow").innerHTML = "你好，晚上好！今天是"+y+"年"+mm+"月"+d+"日"+h+":"+m+":"+s+"";}
t = setTimeout(time,1000); //设定定时器，循环执行
}
</script>
2.要显示的地方插入<div id="timeShow"></div>
方法二：可显示日期，上午下午等
<script type="text/javascript">
var today = new Date(); //新建一个Date对象
var date = today.getDate();//查询当月日期
var day = today.getDay();//查询当前星期几
var month = today.getMonth()+1;//查询月份
var year = today.getFullYear();//查询年份
var hour=today.getHours();
var morning="";
if ( hour<12) morning="你好，上午好！";
if ( hour>=12) morning="你好，下午好！";
if ( hour>=20) morning="你好，晚上好！";
var week="";
if (day==0) week='星期日';
if (day==1) week='星期一';
if (day==2) week='星期二';
if (day==3) week='星期三';
if (day==4) week='星期四';
if (day==5) week='星期五';
if (day==6) week='星期六';
document.write(morning+"今天是" +year+"年"+month+"月"+date+"日 "+week+" ");
</script>
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