在没有任何用户操作的情况下显示javascript输出时遇到问题

在没有任何用户操作的情况下显示javascript输出时遇到问题

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问题描述

这是一个问题:如果整数大于1且只能被1及其自身整除,则将其称为质数.例如,2、3、5和7是质数,而4、6、8和9不是质数.

this is the Question: An integer is said to be prime if it is greater than 1 and divisible only by 1 and itself. For example, 2, 3, 5 and 7 are prime, but 4, 6, 8 and 9 are not.

a)编写一个确定数字是否为质数的函数.b)在确定并打印1到10000之间的所有质数的脚本中使用此功能.

a) Write a function that determines whether a number is prime.b) Use this function in a script that determines and prints all the prime numbers between 1 and 10000.

在确定已找到所有质数之前,您真的必须测试这10000个数字中的多少个?在< textrarea> 中显示结果.

How many of these 10000 numbers do you really have to test before being sure that you have found all the primes? Display the results in a <textrarea>.

这是我的代码:

    function isPrime(n)
    {
        boolean prime=true;
            if(n==1 || n==0)
            {

                prime= false;
            }

            if(n==2)
            {
                prime= true;
            }
            else
            {
                for(int i=2;i<n;i++)
                {
                    if(n%i==0)
                    {
                        prime= false;
                    }
                }
            }
            return prime;
    }
    function printPrimes()
    {
        document.writeln("<textarea rows="10" cols="15">");
        for(var i=0; i<=1000; i++)
        {
            if(isPrime(i)==true)
            {
                document.writeln("<p>" + i + "</p>");
            }
        }
        document.writeln("</textarea>");
    }
    printPrimes();

这是我的html:

<!DOCTYPE html>
<html>
    <head>
        <script src="prime.js" type="text/javascript"> </script>
    </head>
    <body>
        <h1> Prime numbers between 1 and 1000 are: </h1>
    </body>

当我在chrome上打开html文件时,仅标题显示脚本似乎没有运行!

When i open the html file on chrome only the header shows up the script doesnt seem to run!

推荐答案

您正在将脚本导入< head> 中,因此将在其中输出脚本.尝试将其移动到< body> .

You're importing the script in the <head>, so that's where it's output will go. Try moving it to the <body>.

这可能是查找质数的最慢方法.

That's possibly the slowest way to find primes.

edit —另一个问题是:

edit — another problem is this:

            for(int i=2;i<n;i++)

JavaScript中没有 int 关键字-它是 var .这将导致语法错误,该错误将显示在错误控制台中.也没有 boolean 关键字("prime"的声明).在进行任何HTML/JavaScript开发时,保持错误控制台打开很重要.

There is no int keyword in JavaScript - it's var. That would cause a syntax error, which would show up in the error console. Neither is there a boolean keyword (declaration of "prime"). It's important to keep the error console open while doing any HTML/JavaScript development.

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08-15 12:43