WEB编程 入门简单 进阶难

 1 // 计算系统当前是星期几
 2 var str ="";
 3 var week =new Date().getDay();
 4 if (week ==0) {
 5 str ="今天是星期日";
 6 } elseif (week ==1) {
 7 str ="今天是星期一";
 8 } elseif (week ==2) {
 9 str ="今天是星期二";
10 } elseif (week ==3) {
11 str ="今天是星期三";
12 } elseif (week ==4) {
13 str ="今天是星期四";
14 } elseif (week ==5) {
15 str ="今天是星期五";
16 } elseif (week ==6) {
17 str ="今天是星期六";
18 }

 1 // 或者更好一些
 2 var str1 ="今天是星期";
 3 var week =new Date().getDay();
 4 switch (week) {
 5 case0 :
 6 str1 +="日";
 7 break;
 8 case1 :
 9 str1 +="一";
10 break;
11 case2 :
12 str1 +="二";
13 break;
14 case3 :
15 str1 +="三";
16 break;
17 case4 :
18 str1 +="四";
19 break;
20 case5 :
21 str1 +="五";
22 break;
23 case6 :
24 str1 +="六";
25 break;
26 }
27 alert(str);
28 alert(str1);

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);

1 // 计算系统当前是星期几
2 var str ="今天是星期"+"日一二三四五六".charAt(new Date().getDay());