主页 / user-30371619

Varelion's questions

Martin Hope
Varelion
Asked: 2025-04-30 03:39:43 +0800 CST
  • 5

我正在尝试使用节点、路径和 fs 将文件写入现有目录。

它应该如何工作：

  1. 初始化模拟数据。
  2. 循环模拟数据。
  3. 将模拟字符串写入现有目录“输出”
  4. 结束程序。

工作原理：

  1. 初始化模拟数据。
  2. 循环模拟数据。
  3. 尝试写入现有目录。
  4. 产量误差：

错误：

throw new Error(`Error writing: ${err.message}`);
                                ^

Error: Error writing: ENOENT: no such file or directory, open 'C:\Users\username\test\cheerio\output\55-207-0-228_2025-04-29_15:27:51.txt'
    at C:\Users\username\test\cheerio\components\WriteFile.js:31:11
    at node:fs:2385:7
    at FSReqCallback.oncomplete (node:fs:188:23)

存储库

我正在使用这个存储库。处理 node:fs writefile 的函数位于/component/WriteFile.js；它在这里被调用，就在这些行中。

项目树

这是项目结构：

project-root/
├── components/             
├── node_modules/            
├── output/                  // Target for file write. 
├── .gitignore               
├── index.js               
├── LICENSE                 
├── package-lock.json        
├── package.json            
└── README.md

WriteFile 代码片段

为了方便起见，这里发布相关代码。WriteFile.js

const fs = require('node:fs');
const path = require('path');

const makeFile = async (fileName, { contentString, ip }) => {
    const now = new Date();
    const dateString =
        now.getFullYear() +
        '-' +
        String(now.getMonth() + 1).padStart(2, '0') +
        '-' +
        String(now.getDate()).padStart(2, '0') +
        '_' +
        String(now.getHours()).padStart(2, '0') +
        ':' +
        String(now.getMinutes()).padStart(2, '0') +
        ':' +
        String(now.getSeconds()).padStart(2, '0');

    contentString = `DATE: ${dateString}\nFor ip: ${ip}\n${contentString}`;

    const filepath = path.join(
        __dirname,
        '..',
        'output',
        `${fileName}_${dateString}.txt`
    );

    try {
        await fs.writeFile(filepath, contentString, 'utf16le', (err) => {
            if (err) {
                throw new Error(`Error writing: ${err.message}`);
            }
        });
        return 'Success';
    } catch (error) {
        console.error('\nError:\n', error.message, '\n');
    } finally {
        // Code that will run regardless of try/catch result
        // Remember, don't have a return in finally.
        console.log('Final completed.');
    }
};

module.exports = { makeFile };

调用时间：

调用地址为：

async function main() {
    let start = performance.now();
    let elapse;
    i = 0;
    for (const ip of ipList) {
        i++;
        if (i > 3) {
            break;
        }
        const sleep = (ms) =>
            new Promise((resolve) => {
                setTimeout(resolve, ms);
            });
        await sleep(500);

        await makeFile(ip.replaceAll('.', '-'), {
            contentString: 'Mockdata',
            ip: ip
        });
    }
    elapse = performance.now() - start;
    console.log('Total time elapsed: ', elapse / 1000);
}
javascript