npm config set sharp_binary_host "https://npm.taobao.org/mirrors/sharp"
npm config set sharp_libvips_binary_host "https://npm.taobao.org/mirrors/sharp-libvips"

代码示例：2X4拜客生活常识网

import fs from 'fs';
import http from 'http';
import https from 'https';
import sharp from 'sharp';

const downloadImage = (imageUrl: string): Promise => {
    return new Promise((resolve, reject) => {
        (imageUrl.startsWith('https') ? https : http).get(imageUrl, (res) => {
            const chunks: Buffer[] = [];
            res.on('data', (chunk) => chunks.push(chunk));
            res.on('end', (error: Error) => {
                if (error) return reject(error);
                const size = chunks.map(d => d.length).reduce((val, total) => val + total, 0);
                resolve(Buffer.concat(chunks, size));
            });
        });
    });
};
const getCodeImgUrl = () => `https://lzw.me/getcaptcha?theme=light&_pc=${Date.now()}`;
export const saveImages = async (total = 100, nameBase = 10000, baseDir = './images/captcha/') => {
    if (!fs.existsSync(baseDir)) fs.mkdirSync(baseDir, { recursive: true });
    console.log('等待下载的图片数量：', total);
    await downloadImage(getCodeImgUrl()).then(buf => {
        return sharp(buf).png().toFile(path.resolve(baseDir, `${nameBase++}.png`));
    });
    await new Promise(rs => setTimeout(() => rs(null), Math.ceil(Math.random() * 700 + 300)));
    if (--total) await saveImages(total, nameBase, baseDir);
};

saveImages(10, 100, './images/captcha_1/');

然后可以人肉识别，将验证码图片重命名为其对应的验证码值，以便用于后续的训练，有重名的可以加上后缀如 -1 。2X4拜客生活常识网

除了 之外，还有 opencv:2X4拜客生活常识网

2X4拜客生活常识网

（如果你们有什么想法或者有什么错误的地方，可以在评论区留言）2X4拜客生活常识网

• https://www.npmjs.com/package/opencv
• https://www.npmjs.com/package/opencv-wasm

相关参考

• https://github.com/tesseract-ocr/tesseract
• https://github.com/naptha/tesseract.js/
• https://github.com/emscripten-core/emscripten
• https://github.com/UB-Mannheim/tesseract/wiki
• https://www.npmjs.com/package/captcha-cv-ocr

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