node图片自动压缩

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  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  {            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\imagemin\src\app.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]+$/let positionDir, timeId, pngArrayList = [], jpgArrayList = []let timeIndex = 0const setCompress = async () => {    await setInputName();//输入内容    await createTimeFile(positionDir);//创建文件    await getReadFile()//读取文件    ready()//开始压缩        }//判断是否已经有这个文件路径function setInputName() {    return new Promise((resolve, reject) => {        inputVlaue.question('请输入需要压缩文件夹名称：', async (val) => {            let asr = val.replace(/\s+/g, "");            if (asr == 'imagesTest') {                console.log("不可以与默认输出文件夹重名");                return setFileName("请重新输入！\n")            } else if (!reg.test(asr)) {                console.log("只能输入英文");                return setFileName("请重新输入！\n")            }            positionDir = path.join(process.cwd(), asr)            console.log(positionDir);            resolve(positionDir)        })    })}//创建图片文件function createTimeFile(positionDir) {    let time_PATH = path.resolve(__dirname, positionDir);//获取是否已经存在这个文件    return new Promise((resolve, reject) => {        fs.stat(time_PATH, (err, stat) => {            if (err) {                fs.mkdir(positionDir, { recursive: true }, (err) => {                    resolve(err)                    console.log(`创建${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${positionDir}输入yes，开始压缩图片！\n`    inputVlaue.question(msg, answers => {        let asr = answers.trim().toLocaleLowerCase()        if (asr == "yes") {            console.log("开始压缩...\n");            setImageData()        } else {            ready("指令错误请重新输入,输入yes开始压缩图片\n")        }    })}function setImageData() {    if (jpgArrayList.length != 0) {        jpgArrayList = rmSame(jpgArrayList)        //压缩jpg        console.log(jpgArrayList);        jpgArrayList.forEach(item => {            createTimeFile(path.dirname(item.output))            images(item.filename).save(item.output, { quality: 60 })        })    }    //压缩png    pngArrayList = rmSame(pngArrayList)    pngCompress(pngArrayList, pngArrayList.length - 1)}function rmSame(arr) {    let newArray = []    let arrObj = []    for (let index = 0; index  1024)) {            newArray.push(element['filename'])            arrObj.push(element)        } else if (newArray.indexOf(element['filename']) == -1 && (fs.statSync(element['filename']).size <= 1024)) {            let pathDir = path.dirname(element['output'])            createTimeFile(pathDir)//判断存放压缩的文件夹是否已经存在，不存在则创建            fs.createReadStream(element['filename']).pipe(fs.createWriteStream(element['output']))            console.log(`图片${element['filename']}内存过小，直接转移到${element['output']}`)        }    }    return arrObj}//png压缩图片function pngCompress(arr, index) {    //压缩结束    if (index  {            inputVlaue.close()        }, 5000)        return    }    let pathDir = path.dirname(arr[index]['output'])    let filename = arr[index]['filename']    createTimeFile(pathDir)    imagemin([filename], {        destination: pathDir,        plugins: [            imageminPngquant({                quality: [0.6, 0.7]            })        ]    }).then(() => {        console.log(`图片${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/