switch(值){
case 值1:
code;
break;
case 值2:
code;
break;
case 值3:
code;
break;
}switch是固定值上做的判断,而不是泛义上的.
1 <!DOCTYPE html>
2 <html>
3 <head>
4 <meta charset="utf-8">
5 <title></title>
6 </head>
7 <body>
8 <script type="text/javascript">
9 switch(值){
10 case 值1:
11 code;
12 break;
13 case 值2:
14 code;
15 break;
16 case 值3:
17 code;
18 break;
19 }
20 </script>
21 <p>switch是固定值上做的判断,而不是泛义上的.</p>
22 <script type="text/javascript">
23 var jibie = 'F';
24 switch(jibie){
25 case 'A':
26 console.log('90分以上');
27 break;
28 case 'B':
29 console.log('80~90之间');
30 break;
31 case 'C':
32 console.log('70~80之间');
33 break;
34 default:
35 console.log('比较差')
36 }
37 </script>
38 </body>
39 </html>