function showtime()
{
var today,hour,second,minute,year,month,date;
var strDate ;
   today=new Date();
 var n_day = today.getDay();
 switch (n_day)
 {
 case 0:{
 strDate = "星期日"
 }break;
 case 1:{
 strDate = "星期一"
 }break;
 case 2:{
 strDate ="星期二"
 }break;
 case 3:{
 strDate =  "星期三"
 }break;
 case 4:{
 strDate =  "星期四"
 }break;
 case 5:{
 strDate =  "星期五"
 }break;
 case 6:{
 strDate =  "星期六"
 }break;
 case 7:{
 strDate =  "星期日"
 }break;
 }
year = today.getFullYear();
month = today.getMonth()+1;
date = today.getDate();
hour = today.getHours();
minute =today.getMinutes();
second = today.getSeconds();
document.getElementById('time').innerHTML ="<span>" + year + "年" + month + "月" + date + "日</span> <span>" + strDate +"</span>"; //显示时间
}