js實現多張圖片打包成zip
<script src='https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js'></script><script src='https://cdn.bootcdn.net/ajax/libs/jszip/3.6.0/jszip.min.js'></script><script src='https://cdn.bootcdn.net/ajax/libs/FileSaver.js/2.0.5/FileSaver.min.js'></script>2、html頁面
<button onclick='packageImages()'>下載zip</button><span id='status'></span>3、主要代碼
function packageImages() { $(’#status’).text(’處理中。。。。。’) var imgsSrc = [] // https://dss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2496571732,442429806&fm=26&gp=0.jpg // https://dss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2151136234,3513236673&fm=26&gp=0.jpg for (var i = 0; i < 1; i++) {imgsSrc.push(’https://img.alicdn.com/bao/uploaded/i1/446338500/O1CN01npzdZ52Cf3A4cx8JG_!!0-item_pic.jpg_240x240.jpg’) } var imgBase64 = [] //base64圖片 var imageSuffix = [] //圖片后綴 var zip = new JSZip() zip.file(’readme.txt’, ’案件詳情資料n’) var img = zip.folder(’images’) for (var i = 0; i < imgsSrc.length; i++) {var suffix = imgsSrc[i].substring(imgsSrc[i].lastIndexOf(’.’))imageSuffix.push(suffix)getBase64(imgsSrc[i]).then( function (base64) {console.log(base64)imgBase64.push(base64.replace(/^data:image/(png|jpg|jpeg);base64,/, ''))// 當所有圖片轉成base64執行圖片壓縮if (imgsSrc.length == imgBase64.length) { for (var i = 0; i < imgsSrc.length; i++) {// 文件名 數據img.file(i + imageSuffix[i], imgBase64[i], { base64: true,}) } zip.generateAsync({type: ’blob’ }).then(function (content) {console.log(1)// see FileSaver.jssaveAs(content, ’images.zip’)$(’#status’).text(’處理完成。。。。。’) })} }, function (err) {console.log(err) //打印異常信息 }) }}//傳入圖片路徑，返回base64function getBase64(img) { function getBase64Image(img, width, height) {//width、height調用時傳入具體像素值，控制大小 ,不傳則默認圖像大小var canvas = document.createElement(’canvas’)canvas.width = width ? width : img.widthcanvas.height = height ? height : img.heightvar ctx = canvas.getContext(’2d’)ctx.drawImage(img, 0, 0, canvas.width, canvas.height)var dataURL = canvas.toDataURL()return dataURL } var image = new Image() image.crossOrigin = ’Anonymous’ image.src = img var deferred = $.Deferred() if (img) {image.onload = function () { deferred.resolve(getBase64Image(image)) //將base64傳給done上傳處理}return deferred.promise() //問題要讓onload完成后再return sessionStorage[’imgTest’] }}4、優化圖片轉base64的流程，提高zip的打包速度
function packageImages() { $(’#status’).text(’處理中。。。。?！? var imgsSrc = [] // https://dss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2496571732,442429806&fm=26&gp=0.jpg // https://dss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2151136234,3513236673&fm=26&gp=0.jpg for (var i = 0; i < 1; i++) {imgsSrc.push(’https://dss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2496571732,442429806&fm=26&gp=0.jpg’) } var imgBase64 = [] //base64圖片 var imageSuffix = [] //圖片后綴 var zip = new JSZip() zip.file(’readme.txt’, ’案件詳情資料n’) var img = zip.folder(’images’) for (var i = 0; i < imgsSrc.length; i++) {var suffix = imgsSrc[i].substring(imgsSrc[i].lastIndexOf(’.’))imageSuffix.push(suffix)getBase64(imgsSrc[i], function (base64) { imgBase64.push(base64.replace(/^data:image/(png|jpg|jpeg);base64,/, '')) if (imgsSrc.length == imgBase64.length) {for (var i = 0; i < imgsSrc.length; i++) { // 文件名 數據 img.file(i + imageSuffix[i], imgBase64[i], {base64: true, })}zip.generateAsync({ type: ’blob’}).then(function (content) { console.log(1) // see FileSaver.js saveAs(content, ’images.zip’) $(’#status’).text(’處理完成。。。。。’)}) }}) }}function getBase64(img, callback) { fetch(img).then(res => res.blob()).then(res => { let fr = new FileReader();//https://developer.mozilla.org/zh-CN/docs/Web/API/FileReader fr.onload = function (e) {callback(e.target.result) }; fr.onerror = function () {console.log(’讀取錯誤！’) }; fr.readAsDataURL(res);//如果是轉文字，第二個參數可以使用編碼})}5、再優化，通過axios把圖片轉成base64
function packageImages() { $(’#status’).text(’處理中。。。。?！? var imgsSrc = [] // https://dss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2496571732,442429806&fm=26&gp=0.jpg // https://dss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2151136234,3513236673&fm=26&gp=0.jpg for (var i = 0; i < 100; i++) {imgsSrc.push(’https://dss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2496571732,442429806&fm=26&gp=0.jpg’) } handleBatchDownload(imgsSrc)}getFile = (url) => { return new Promise((resolve, reject) => {axios({ method: ’get’, url, responseType: ’arraybuffer’}).then(data => { resolve(data.data)}).catch(error => { reject(error.toString())}) })};// 批量下載handleBatchDownload = async (selectImgList) => { const data = selectImgList; const zip = new JSZip() const promises = [] await data.forEach((item, idx) => {// console.log(item, idx)const promise = this.getFile(item).then(async (data) => { // 下載文件, 并存成ArrayBuffer對象 const arr_name = item.split('/'); let file_name = arr_name[arr_name.length - 1] // 獲取文件名 // if (file_name.indexOf(’.png’) == -1) { // file_name = file_name + ’.png’ // } await zip.file(idx + ’.png’, data, {binary: true }) // 逐個添加文件})promises.push(promise) }) Promise.all(promises).then(() => {zip.generateAsync({ type: 'blob'}).then(content => { // 生成二進制流 saveAs(content, 'photo.zip') // 利用file-saver保存文件 $(’#status’).text(’處理完成。。。。。’)}) })};
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