当天星期几

<script type="text/javascript">

var d=new Date()

var weekday=new Array(7)
weekday[0]="Sunday"
weekday[1]="Monday"
weekday[2]="Tuesday"
weekday[3]="Wednesday"
weekday[4]="Thursday"
weekday[5]="Friday"
weekday[6]="Saturday"

document.write("Today it is " + weekday[d.getDay()])

</script>

如果是指定日期的话，当天的月份，比如8月份的话，month的值应该是7，
如果是求当天的天数的话，getDate中的month是不减一的。