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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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