update: 优化质数代码
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				@ -371,9 +371,10 @@ i的值:9
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                //console.log(i);
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                //判断num是否能被i整除
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                if (num % i == 0) {
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                    //如果num能被i整除,则说明num一定不是质数
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                    //设置flag为false
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                    //一旦发现:如果num能被i整除,则说明num一定不是质数,
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                    //此时:设置flag为false,然后跳出 for 循环
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                    flag = false;
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                    break;
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                }
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            }
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