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