var today;
var hello;

today=new Date();    //此语句通过调用函数Date()和关键字new将today变成了一个时间对象

//通过对象today的getHours方法确定时间是商务、下午还是晚上，并将相应的问候语字符串赋给变量hello
if(today.getHours()<=9) hello="早上好!欢迎您的光临，";
if((9<today.getHours())&&(today.getHours()<=12)) hello="上午好! 欢迎您的光临，";
if((12<today.getHours())&&(today.getHours()<=18)) hello="下午好! 欢迎您的光临，";
if(18<today.getHours()) hello="晚上好! 欢迎您的光临，";

//在HTML文档中输出当前的具体时间
//document.write(hello);
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" ;
document.write(""+(today.getYear()) + "年"+(today.getMonth() + 1 ) + "月" + today.getDate() + "日 " + day +"" );