JS获取当前时间

1 .
<script language= "JavaScript" >
//日期
var now = new  Date(); //获取系统日期,即Sat Jul 29 08:24:48 UTC+0800 2006
var yy = now.getYear(); //截取年,即2006
var mm = now.getMonth(); //截取月,即07
var dd = now.getDay(); //截取日,即29
//取时间
var hh = now.getHours(); //截取小时,即8
var mm = now.getMinutes(); //截取分钟,即34
var ss = now.getTime() % 60000 ; //获取时间,因为系统中时间是以毫秒计算的,
所以秒要通过余 60000 得到。
ss = (ss - (ss % 1000 )) / 1000 ; //然后,将得到的毫秒数再处理成秒
var clock = hh+ ':' ; //将得到的各个部分连接成一个日期时间
if  (mm < 10 ) clock += '0' ; //字符串
clock += mm+ ':'
if  (ss < 10 ) clock += '0'
clock += ss;
</script>
 
 
2 .
 
</head>
<body>
 
<script language= "javascript" >
var week;
if ( new  Date().getDay()== 0 )          week= "周日"
if ( new  Date().getDay()== 1 )          week= "周一"
if ( new  Date().getDay()== 2 )          week= "周二"
if ( new  Date().getDay()== 3 )          week= "周三"
if ( new  Date().getDay()== 4 )          week= "周四"
if ( new  Date().getDay()== 5 )          week= "周五"
if ( new  Date().getDay()== 6 )          week= "周六"
document.write(( new  Date().getMonth()+ 1 )+ "月" + new  Date().getDate()+ "日 " +week);
</script>
 
</body>
</html>
 
3 .
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
 
<html xmlns= "http://www.w3.org/1999/xhtml"  xml:lang= "en"  lang= "en" >
<head>
<title></title>
<script type= "text/javascript" >
    function clock(){
        var nowtime= new  Date();
        var flag= "AM" ;
        var hours=nowtime.getHours();
        if (hours> 12 ){
            hours-= 12 ;
            flag= "PM" ;
        }
        hours=hours> 9 ?hours: "0" +hours;
        var minutes=nowtime.getMinutes();
        minutes=minutes> 9 ?minutes: "0" +minutes;
        var seconds=nowtime.getSeconds();
        seconds=seconds> 9 ?seconds: "0" +seconds;
        var disptime=hours+ ":" +minutes+ ":" +seconds+ " " +flag;
        document.getElementById( "clock" ).innerHTML=disptime;
        setTimeout( "clock()" , 1000 );
    }
</script>
</head>
<body>
<div id= "clock" ></div>
<script type= "text/javascript" >
clock();
</script>
</body>
</html>

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