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所属分类：Web前端
图片压缩
借用了images、imagemin等第三方库，压缩jpg、Png图片
viteImagemin也可以实现，代码量更加少，squoosh就没用过了
输入需要压缩的文件
//判断是否已经有这个文件路径 function setInputName() { return new Promise((resolve, reject) => { inputVlaue.question('请输入需要压缩文件夹名称：', async (val) => { let asr = val.replace(/s+/g, ""); if (asr == 'imagesTest') { console.log("不可以与默认输出文件夹重名"); return setFileName("请重新输入！n") } else if (!reg.test(asr)) { console.log("只能输入英文"); return setFileName("请重新输入！n") } positionDir = path.join(process.cwd(), asr) console.log(positionDir); resolve(positionDir) }) }) } 不存在则自动创建文件
不建议在调用 fs.open() 、fs.readFile() 或 fs.writeFile() 之前使用 fs.stat() 检查一个文件是否存在。 作为替代，用户代码应该直接打开/读取/写入文件，当文件无效时再处理错误。
如果要检查一个文件是否存在且不操作它，推荐使用 fs.access()
这里使用node内置path处理文件
function createTimeFile(positionDir) { let time_PATH = path.resolve(__dirname, positionDir);//获取是否已经存在这个文件 return new Promise((resolve, reject) => { fs.stat(time_PATH, (err, stat) => { if (err) { fs.mkdir(positionDir, { recursive: true }, (err) => { resolve(err) console.log(`创建${positionDir}成功！`); }) } else { resolve(stat) } }) }) } 文件创建成功，输入xx指令进行压缩
function ready() { let msg=`请把所需压缩图片放入${positionDir}输入yes，开始压缩图片！n` inputVlaue.question(msg, answers => { let asr = answers.trim().toLocaleLowerCase() if (asr == "yes") { console.log("开始压缩...n"); setImageData() } else { ready("指令错误请重新输入,输入yes开始压缩图片n") } }) } 读取需要压缩的文件
//读取需要压缩的文件夹 function getReadFile() { fs.readdir(positionDir, "utf-8", (err, data) => { console.log(data.length); if (data.length == 0) { console.log("还没有图片，请添加"); } data.forEach((item, index) => { let filePath = path.join(positionDir, item) let filename = filePath.replace(/\/g, "/");//把 替换为 / let output = filename.replace(positionDir.replace(/\/g, "/"), outputDir.replace(/\/g, "/"));//输出位置 if (path.extname(item) == ".png") { pngArrayList.push({ filename, output }) } else if (path.extname(item) == ".jpg") { jpgArrayList.push({ filename, output }) } else if (fs.statSync(filePath).isDirectory()) { readfile(filePath) } }) }) } 针对jpg和png处理使用不同的方法
function setImageData() { if (jpgArrayList.length != 0) { jpgArrayList = rmSame(jpgArrayList) //压缩jpg console.log(jpgArrayList); jpgArrayList.forEach(item => { createTimeFile(path.dirname(item.output)) images(item.filename).save(item.output, { quality: 60 }) }) } //压缩png pngArrayList = rmSame(pngArrayList) pngCompress(pngArrayList, pngArrayList.length - 1) } function rmSame(arr) { let newArray = [] let arrObj = [] for (let index = 0; index < arr.length; index++) { const element = arr[index]; if (newArray.indexOf(element['filename']) == -1 && (fs.statSync(element['filename']).size > 1024)) { newArray.push(element['filename']) arrObj.push(element) } else if (newArray.indexOf(element['filename']) == -1 && (fs.statSync(element['filename']).size <= 1024)) { let pathDir = path.dirname(element['output']) createTimeFile(pathDir)//判断存放压缩的文件夹是否已经存在，不存在则创建 fs.createReadStream(element['filename']).pipe(fs.createWriteStream(element['output'])) console.log(`图片${element['filename']}内存过小，直接转移到${element['output']}`) } } return arrObj } //png压缩图片 function pngCompress(arr, index) { //压缩结束 if (index < 0) { console.log("n本窗口在5秒后关闭！") setTimeout(() => { inputVlaue.close() }, 5000) return } let pathDir = path.dirname(arr[index]['output']) let filename = arr[index]['filename'] createTimeFile(pathDir) imagemin([filename], { destination: pathDir, plugins: [ imageminPngquant({ quality: [0.6, 0.7] }) ] }).then(() => { console.log(`图片${filename}压缩完成!`); pngCompress(arr, index - 1) }).catch(err => { console.log(`${arr[index]['filename']}图片压缩不了了，直接转移到${arr[index]['output']}`) fs.createReadStream(arr[index]['filename']).pipe(fs.createWriteStream(arr[index]['output'])) pngCompress(arr, index - 1) }); } 全部代码
/* * @Author: zlc * @Date: 2022-04-14 16:34:12 * @LastEditTime: 2022-04-15 10:26:16 * @LastEditors: zlc * @Description: 图片压缩 * @FilePath: git项目project-template案例图片压缩imageminsrcapp.js */ const fs = require("fs") const imagemin = require('imagemin'); const imageminPngquant = require('imagemin-pngquant'); const path = require("path") const images = require("images") const readline = require("readline"); const { resolve } = require("path"); const inputVlaue = readline.createInterface({ input: process.stdin, output: process.stdout }); let outputDir = path.join(process.cwd(), "imagesTest") let reg = /^[a-zA-Z]+$/ let positionDir, timeId, pngArrayList = [], jpgArrayList = [] let timeIndex = 0 const setCompress = async () => { await setInputName();//输入内容 await createTimeFile(positionDir);//创建文件 await getReadFile()//读取文件 ready()//开始压缩 } //判断是否已经有这个文件路径 function setInputName() { return new Promise((resolve, reject) => { inputVlaue.question('请输入需要压缩文件夹名称：', async (val) => { let asr = val.replace(/s+/g, ""); if (asr == 'imagesTest') { console.log("不可以与默认输出文件夹重名"); return setFileName("请重新输入！n") } else if (!reg.test(asr)) { console.log("只能输入英文"); return setFileName("请重新输入！n") } positionDir = path.join(process.cwd(), asr) console.log(positionDir); resolve(positionDir) }) }) } //创建图片文件 function createTimeFile(positionDir) { let time_PATH = path.resolve(__dirname, positionDir);//获取是否已经存在这个文件 return new Promise((resolve, reject) => { fs.stat(time_PATH, (err, stat) => { if (err) { fs.mkdir(positionDir, { recursive: true }, (err) => { resolve(err) console.log(`创建${positionDir}成功！`); }) } else { resolve(stat) } }) }) } //读取需要压缩的文件夹 function getReadFile() { fs.readdir(positionDir, "utf-8", (err, data) => { console.log(data.length); if (data.length == 0) { console.log("还没有图片，请添加"); } data.forEach((item, index) => { let filePath = path.join(positionDir, item) let filename = filePath.replace(/\/g, "/");//把 替换为 / let output = filename.replace(positionDir.replace(/\/g, "/"), outputDir.replace(/\/g, "/"));//输出位置 if (path.extname(item) == ".png") { pngArrayList.push({ filename, output }) } else if (path.extname(item) == ".jpg") { jpgArrayList.push({ filename, output }) } else if (fs.statSync(filePath).isDirectory()) { readfile(filePath) } }) }) } function ready() { let msg=`请把所需压缩图片放入${positionDir}输入yes，开始压缩图片！n` inputVlaue.question(msg, answers => { let asr = answers.trim().toLocaleLowerCase() if (asr == "yes") { console.log("开始压缩...n"); setImageData() } else { ready("指令错误请重新输入,输入yes开始压缩图片n") } }) } function setImageData() { if (jpgArrayList.length != 0) { jpgArrayList = rmSame(jpgArrayList) //压缩jpg console.log(jpgArrayList); jpgArrayList.forEach(item => { createTimeFile(path.dirname(item.output)) images(item.filename).save(item.output, { quality: 60 }) }) } //压缩png pngArrayList = rmSame(pngArrayList) pngCompress(pngArrayList, pngArrayList.length - 1) } function rmSame(arr) { let newArray = [] let arrObj = [] for (let index = 0; index < arr.length; index++) { const element = arr[index]; if (newArray.indexOf(element['filename']) == -1 && (fs.statSync(element['filename']).size > 1024)) { newArray.push(element['filename']) arrObj.push(element) } else if (newArray.indexOf(element['filename']) == -1 && (fs.statSync(element['filename']).size <= 1024)) { let pathDir = path.dirname(element['output']) createTimeFile(pathDir)//判断存放压缩的文件夹是否已经存在，不存在则创建 fs.createReadStream(element['filename']).pipe(fs.createWriteStream(element['output'])) console.log(`图片${element['filename']}内存过小，直接转移到${element['output']}`) } } return arrObj } //png压缩图片 function pngCompress(arr, index) { //压缩结束 if (index < 0) { console.log("n本窗口在5秒后关闭！") setTimeout(() => { inputVlaue.close() }, 5000) return } let pathDir = path.dirname(arr[index]['output']) let filename = arr[index]['filename'] createTimeFile(pathDir) imagemin([filename], { destination: pathDir, plugins: [ imageminPngquant({ quality: [0.6, 0.7] }) ] }).then(() => { console.log(`图片${filename}压缩完成!`); pngCompress(arr, index - 1) }).catch(err => { console.log(`${arr[index]['filename']}图片压缩不了了，直接转移到${arr[index]['output']}`) fs.createReadStream(arr[index]['filename']).pipe(fs.createWriteStream(arr[index]['output'])) pngCompress(arr, index - 1) }); } setCompress() git地址：https://gitee.com/KingSio/project-template/tree/master/
