JS基础复习

1.JS编写判断是否为质数

 1 <!doctype html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Document</title>
 6 </head>
 7 <script type="text/javascript">
 8     var num = 3;
 9     flag = true;
10     for(var i = 2;i < num - 1;i++){
11         if(num%i==0)
12             flag = true;
13         break;
14     }
15 
16     if(flag){
17         alert("是质数");
18     }else{    
19         alert("不是质数");
20     }
21 </script>
22 <body>
23     
24 </body>
25 </html>

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2.JS计算多个数的和

 1 <!doctype html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Document</title>
 6 </head>
 7 <script type="text/javascript">
 8     var sum = function(){
 9         var result = 0;
10         for(var i = 0;i < arguments.length;i++){
11             result+=arguments[i];
12         }
13         return result;
14     }
15     alert(sum(1,2,3,4,5));
16 </script>
17 <body>
18     
19 </body>
20 </html>

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