获取星期几的方法

第一种：

 1 var str = "";  
 2 var week = new Date().getDay();  
 3 if (week == 0) {  
 4         str = "今天是星期日";  
 5 } else if (week == 1) {  
 6         str = "今天是星期一";  
 7 } else if (week == 2) {  
 8         str = "今天是星期二";  
 9 } else if (week == 3) {  
10         str = "今天是星期三";  
11 } else if (week == 4) {  
12         str = "今天是星期四";  
13 } else if (week == 5) {  
14         str = "今天是星期五";  
15 } else if (week == 6) {  
16         str = "今天是星期六";  
17 }  
18  name="code" class="javascript">    alert(str);</pre>

第二种：

  
var str = "今天是星期";  
var week = new Date().getDay();  
switch (week) {  
        case 0 :  
                str += "日";  
                break;  
        case 1 :  
                str += "一";  
                break;  
        case 2 :  
                str += "二";  
                break;  
        case 3 :  
                str += "三";  
                break;  
        case 4 :  
                str += "四";  
                break;  
        case 5 :  
                str += "五";  
                break;  
        case 6 :  
                str += "六";  
                break;  
}  
alert(str);

第三种：

1 var a = new Array("日", "一", "二", "三", "四", "五", "六");  
2 var week = new Date().getDay();  
3 var str = "今天是星期"+ a[week];  
4 alert(str);

第四种：

var str = "今天是星期" + "日一二三四五六".charAt(new Date().getDay());alert(str);