圖片壓縮
借用了images、imagemin等第三方庫，壓縮jpg、Png圖片
viteImagemin也可以實現，代碼量更加少，squoosh就沒用過了

輸入需要壓縮的文件

//判斷是否已經有這個文件路徑
function setInputName() {
    return new Promise((resolve, reject) => {
        inputVlaue.question('請輸入需要壓縮文件夾名稱：', async (val) => {
            let asr = val.replace(/\s+/g, "");
            if (asr == 'imagesTest') {
                console.log("不可以與預設輸出文件夾重名");
                return setFileName("請重新輸入！\n")
            } else if (!reg.test(asr)) {
                console.log("只能輸入英文");
                return setFileName("請重新輸入！\n")
            }
            positionDir = path.join(process.cwd(), asr)
            console.log(positionDir);
            resolve(positionDir)

        })
    })

}

不存在則自動創建文件

不建議在調用 fs.open() 、fs.readFile() 或 fs.writeFile() 之前使用 fs.stat() 檢查一個文件是否存在。 作為替代，用戶代碼應該直接打開/讀取/寫入文件，當文件無效時再處理錯誤。
如果要檢查一個文件是否存在且不操作它，推薦使用 fs.access()
這裡使用node內置path處理文件

function createTimeFile(positionDir) {
    let time_PATH = path.resolve(__dirname, positionDir);//獲取是否已經存在這個文件
    return new Promise((resolve, reject) => {
        fs.stat(time_PATH, (err, stat) => {
            if (err) {
                fs.mkdir(positionDir, { recursive: true }, (err) => {
                    resolve(err)
                    console.log(`創建${positionDir}成功！`);
                })
            } else {
                resolve(stat)

            }


        })

    })


}

文件創建成功，輸入xx指令進行壓縮

function ready() {
    let msg=`請把所需壓縮圖片放入${positionDir}輸入yes，開始壓縮圖片！\n`
    inputVlaue.question(msg, answers => {
        let asr = answers.trim().toLocaleLowerCase()
        if (asr == "yes") {
            console.log("開始壓縮...\n");
            setImageData()
        } else {
            ready("指令錯誤請重新輸入,輸入yes開始壓縮圖片\n")
        }
    })
}

讀取需要壓縮的文件

//讀取需要壓縮的文件夾
function getReadFile() {
    fs.readdir(positionDir, "utf-8", (err, data) => {
        console.log(data.length);

        if (data.length == 0) {
            console.log("還沒有圖片，請添加");
        }
        data.forEach((item, index) => {
            let filePath = path.join(positionDir, item)
            let filename = filePath.replace(/\\/g, "/");//把 \ 替換為 /
            let output = filename.replace(positionDir.replace(/\\/g, "/"), outputDir.replace(/\\/g, "/"));//輸出位置
            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)
            }

        })



    })
}

針對jpg和png處理使用不同的方法

function setImageData() {
    if (jpgArrayList.length != 0) {
        jpgArrayList = rmSame(jpgArrayList)
        //壓縮jpg
        console.log(jpgArrayList);
        jpgArrayList.forEach(item => {
            createTimeFile(path.dirname(item.output))
            images(item.filename).save(item.output, { quality: 60 })
        })
    }
    //壓縮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)//判斷存放壓縮的文件夾是否已經存在，不存在則創建
            fs.createReadStream(element['filename']).pipe(fs.createWriteStream(element['output']))
            console.log(`圖片${element['filename']}記憶體過小，直接轉移到${element['output']}`)
        }
    }
    return arrObj
}

//png壓縮圖片
function pngCompress(arr, index) {
    //壓縮結束
    if (index < 0) {
        console.log("\n本視窗在5秒後關閉！")
        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(`圖片${filename}壓縮完成!`);
        pngCompress(arr, index - 1)
    }).catch(err => {
        console.log(`${arr[index]['filename']}圖片壓縮不了了，直接轉移到${arr[index]['output']}`)
        fs.createReadStream(arr[index]['filename']).pipe(fs.createWriteStream(arr[index]['output']))
        pngCompress(arr, index - 1)
    });

}

全部代碼

/*
 * @Author: zlc
 * @Date: 2022-04-14 16:34:12
 * @LastEditTime: 2022-04-15 10:26:16
 * @LastEditors: zlc
 * @Description: 圖片壓縮
 * @FilePath: \git項目\project-template\案例\圖片壓縮\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 = 0
const setCompress = async () => {
    await setInputName();//輸入內容
    await createTimeFile(positionDir);//創建文件
    await getReadFile()//讀取文件
    ready()//開始壓縮
    
    

}

//判斷是否已經有這個文件路徑
function setInputName() {
    return new Promise((resolve, reject) => {
        inputVlaue.question('請輸入需要壓縮文件夾名稱：', async (val) => {
            let asr = val.replace(/\s+/g, "");
            if (asr == 'imagesTest') {
                console.log("不可以與預設輸出文件夾重名");
                return setFileName("請重新輸入！\n")
            } else if (!reg.test(asr)) {
                console.log("只能輸入英文");
                return setFileName("請重新輸入！\n")
            }
            positionDir = path.join(process.cwd(), asr)
            console.log(positionDir);
            resolve(positionDir)

        })
    })

}
//創建圖片文件
function createTimeFile(positionDir) {
    let time_PATH = path.resolve(__dirname, positionDir);//獲取是否已經存在這個文件
    return new Promise((resolve, reject) => {
        fs.stat(time_PATH, (err, stat) => {
            if (err) {
                fs.mkdir(positionDir, { recursive: true }, (err) => {
                    resolve(err)
                    console.log(`創建${positionDir}成功！`);
                })
            } else {
                resolve(stat)

            }


        })

    })


}


//讀取需要壓縮的文件夾
function getReadFile() {
    fs.readdir(positionDir, "utf-8", (err, data) => {
        console.log(data.length);

        if (data.length == 0) {
            console.log("還沒有圖片，請添加");
        }
        data.forEach((item, index) => {
            let filePath = path.join(positionDir, item)
            let filename = filePath.replace(/\\/g, "/");//把 \ 替換為 /
            let output = filename.replace(positionDir.replace(/\\/g, "/"), outputDir.replace(/\\/g, "/"));//輸出位置
            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=`請把所需壓縮圖片放入${positionDir}輸入yes，開始壓縮圖片！\n`
    inputVlaue.question(msg, answers => {
        let asr = answers.trim().toLocaleLowerCase()
        if (asr == "yes") {
            console.log("開始壓縮...\n");
            setImageData()
        } else {
            ready("指令錯誤請重新輸入,輸入yes開始壓縮圖片\n")
        }
    })
}

function setImageData() {
    if (jpgArrayList.length != 0) {
        jpgArrayList = rmSame(jpgArrayList)
        //壓縮jpg
        console.log(jpgArrayList);
        jpgArrayList.forEach(item => {
            createTimeFile(path.dirname(item.output))
            images(item.filename).save(item.output, { quality: 60 })
        })
    }
    //壓縮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)//判斷存放壓縮的文件夾是否已經存在，不存在則創建
            fs.createReadStream(element['filename']).pipe(fs.createWriteStream(element['output']))
            console.log(`圖片${element['filename']}記憶體過小，直接轉移到${element['output']}`)
        }
    }
    return arrObj
}

//png壓縮圖片
function pngCompress(arr, index) {
    //壓縮結束
    if (index < 0) {
        console.log("\n本視窗在5秒後關閉！")
        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(`圖片${filename}壓縮完成!`);
        pngCompress(arr, index - 1)
    }).catch(err => {
        console.log(`${arr[index]['filename']}圖片壓縮不了了，直接轉移到${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/