jquery 获得星期几

<script language="JavaScript">

   function getDayOfWeek(obj){
      var dayValue = obj.value;
      var day = new Date(Date.parse(dayValue.replace(/-/g, '/'))); //将日期值格式化
      var today = new Array("星期天","星期一","星期二","星期三","星期四","星期五","星期六");
      document.getElementById("2").innerHTML = today[day.getDay()]; //day.getDay();根据Date返一个星期中的某其中0为星期日
   }

</script>