function showTime(){

var date=new Date();

var year=date.getYear();

var month=date.getMonth()+1;

var day=date.getDate();

var xingqi;

if(date.getDay()==0) xingqi='星期天';

if(date.getDay()==1) xingqi='星期一';

if(date.getDay()==2) xingqi='星期二';

if(date.getDay()==3) xingqi='星期三';

if(date.getDay()==4) xingqi='星期四';

if(date.getDay()==5) xingqi='星期五';

if(date.getDay()==6) xingqi='星期六';

var hour=date.getHours();

var minute=date.getMinutes();

var second=date.getSeconds();

if (minute < 10) {
    minute = "0" + minute;
}

if (second < 10) {
    second = "0" + second;
}

var obj = document.getElementById('showtime');

obj.innerHTML = "今天是：" + year + '年' + month + '月' + day + '日' + "  " + xingqi + "  " + hour + ':' + minute + ':' + second;

window.setTimeout("showTime();", 100);

}
window.onload = showTime;