var welcome="今天是：";
var ndt = new Date();
welcome = welcome+ndt.getYear()+"年"+(ndt.getMonth()+1)+"月"+ndt.getDate()+"日 ";
if(ndt.getDay()==0)	day = "星期日";
else if(ndt.getDay()==1)	day = "星期一";
else if(ndt.getDay()==2)	day = "星期二";
else if(ndt.getDay()==3)	day = "星期三";
else if(ndt.getDay()==4)	day = "星期四";
else if(ndt.getDay()==5)	day = "星期五";
else if(ndt.getDay()==6)	day = "星期六";
welcome = welcome+day;