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const sharp = require('sharp');
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const fs = require('fs');
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const path = require('path');
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// 常见图片格式
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const imageExtensions = new Set(['jpg', 'jpeg', 'png', 'gif', 'webp', 'tiff', 'svg']);
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//图片文件夹路径
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let inputDir = '';
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//输出比例
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const outputArr = [
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{
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name: '主图1：1',
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scale: [1, 1],
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dir: '',
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},
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{
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name: '主图3：4',
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scale: [3, 4],
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dir: '',
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},
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];
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// 指定要查找的目录
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const directoryPath = 'E:/商品资料';
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// 函数获取最新创建的子文件夹路径
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function getLatestFolder(directory) {
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let latestTime = 0;
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// 读取指定目录
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fs.readdirSync(directory, { withFileTypes: true }).forEach((file) => {
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if (file.isDirectory()) {
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const folderPath = path.join(directory, file.name);
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const stats = fs.statSync(folderPath);
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const creationTime = stats.birthtimeMs; // 获取创建时间
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// 找到最新创建的文件夹
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if (creationTime > latestTime) {
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latestTime = creationTime;
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inputDir = folderPath;
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}
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}
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});
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if (inputDir) {
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console.log('最新创建的文件夹路径:', inputDir);
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} else {
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console.log('没有找到子文件夹。');
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}
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}
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// 调用函数
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getLatestFolder(directoryPath);
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//创建输出文件夹
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outputArr.forEach((item) => {
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item.dir = `${inputDir}/${item.scale.join('x')}`;
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if (!fs.existsSync(item.dir)) {
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fs.mkdirSync(item.dir);
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}
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});
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async function resizeImage(imageDir, outputDir, scale) {
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let imgData = await sharp(imageDir).metadata();
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await sharp(imageDir)
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.extract({
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width: imgData.width,
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height: Math.floor(imgData.width / (scale[0] / scale[1])),
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left: 0,
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top: 0,
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})
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.toFile(outputDir);
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}
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//读取输入目录下所有文件
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fs.readdirSync(inputDir).forEach(async (file) => {
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console.log(file);
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const ext = file.split('.').pop().toLowerCase();
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if (imageExtensions.has(ext)) {
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const inputPath = path.join(inputDir, file);
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outputArr.forEach((item) => {
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const outputPath = path.join(item.dir, file);
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resizeImage(inputPath, outputPath, item.scale)
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.then(() => {
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console.log(`${file}的${item.name}图片已生成`);
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})
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.catch((err) => {
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console.error(`${file}的${item.name}图片生成失败`, err);
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});
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});
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}
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});
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