js简单应用-显示当时星期几

    <script type="text/javascript">
   today = new 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";
alert(day);
    </script>