在网页上获取当前日期，数字时钟

(function() {
var d, s ="";
var x = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
d = new Date();
s+=d.getFullYear()+"年"+(d.getMonth() + 1)+"月"+d.getDate()+"日　";
s+=x[d.getDay()];
document.writeln(s);
}
)();

<span id="datetime">time</span>
<script>
function setTime(){
var day="";
var month="";
var ampm="";
var ampmhour="";
var myweekday="";
var year="";
var myHours="";
var myMinutes="";
var mySeconds="";
mydate=new Date();
myweekday=mydate.getDay();
mymonth=parseInt(mydate.getMonth()+1)<10?"0"+(mydate.getMonth()+1):mydate.getMonth()+1;
myday= mydate.getDate();
myyear= mydate.getYear();
myHours = mydate.getHours();
myMinutes = mydate.getMinutes();
mySeconds = parseInt(mydate.getSeconds())<10?"0"+mydate.getSeconds():mydate.getSeconds();
year=(myyear > 200) ? myyear : 1900 + myyear;
if(myweekday == 0)
weekday=" 星期日 ";
else if(myweekday == 1)
weekday=" 星期一 ";
else if(myweekday == 2)
weekday=" 星期二 ";
else if(myweekday == 3)
weekday=" 星期三 ";
else if(myweekday == 4)
weekday=" 星期四 ";
else if(myweekday == 5)
weekday=" 星期五 ";
else if(myweekday == 6)
weekday=" 星期六 ";
datetime.innerText=year+"年"+mymonth+"月"+myday+"日 "+myHours+":"+myMinutes+":"+mySeconds+" "+weekday;
setTimeout("setTime()",1000);
}
setTime();
</script>