1. mydate.getDay()返回的是0,1,2,3,4,5,6的數(shù)字

2. 0代表周天，返回的數(shù)字可以作為weekday[]這個數(shù)組的索引（下標(biāo)）

3. 比如今天星期五，weekday[mydate.getDay()] 就是weekday[5]，取下標(biāo)為5的數(shù)組的值 - 星期五。

參考代碼

????<script?type="text/javascript">????	
????var?date?=?new?Date();????	
????var?weekday?=?["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];		
????var?index?=?date.getDay();		
????ocument.write(weekday[index]);????
????</script>