var week; 

if(new Date().getDay()==0)          week="星期日"

if(new Date().getDay()==1)          week="星期一"

if(new Date().getDay()==2)          week="星期二" 

if(new Date().getDay()==3)          week="星期三"

if(new Date().getDay()==4)          week="星期四"

if(new Date().getDay()==5)          week="星期五"

if(new Date().getDay()==6)          week="星期六"

document.write(new Date().getYear()+"年"+(new Date().getMonth()+1)+"月"+new Date().getDate()+"日  "+week);