var today = new Date();
var day; 
var date;

if(today.getDay()==0) day = "星期日";

if(today.getDay()==1) day = "星期一";

if(today.getDay()==2) day = "星期二";

if(today.getDay()==3) day = "星期三";

if(today.getDay()==4) day = "星期四";

if(today.getDay()==5) day = "星期五";

if(today.getDay()==6) day = "星期六";

date = (today.getYear()) + "年" + (today.getMonth() + 1 ) + "月" + today.getDate() + "日" +"　"+ day +"　　";

document.write(date+"      ");