javascript根据日期判断星期几

<SCRIPT>
var   s   =  '2011-11-17';
alert( "今天星期 "+"天一二三四五六 ".charAt(new   Date(s).getDay()));
alert("星期 "   +   new   Date(s).getDay());
</SCRIPT>

<SCRIPT>
var   s   =  '2011-11-17';
//alert(new Date());
//alert( "今天星期 "+"天一二三四五六 ".charAt(new  Date(s).getDay()));
//alert(new Date().getDay());
var b = new Date(Date.parse(s.replace(/\-/g,"/")));
alert(b.getDay());
</SCRIPT>

var weekDay = ["星期天", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
var dateStr = "2008-08-08";
var myDate = new Date(Date.parse(dateStr.replace(/-/g, "/")));
alert(weekDay[myDate.getDay()]);