jQuery页面图片批量打包下载

<script src="http://stuk.github.io/jszip/test/jquery-1.8.3.min.js"></script>
<script type="text/javascript" src="https://stuk.github.io/jszip/dist/jszip.js"></script>
<script type="text/javascript" src="http://stuk.github.io/jszip/vendor/FileSaver.js"></script>
<script type="text/javascript">
function packageImages() {
    $('#status').text('处理中...');
    var imgs = $('img');
    var imgsSrc = [];
    var imgBase64 = [];
    var imageSuffix = []; //图片后缀
    var zip = new JSZip();
    zip.file("readme.txt", "ECSHOP插件网-www.ecshop.cx\n");
    var img = zip.folder("images");
    for (var i = 0; i < imgs.length; i++) {
        var src = imgs[i].getAttribute("src");
        var suffix = src.substring(src.lastIndexOf("."));
        imageSuffix.push(suffix);
        getBase64(imgs[i].getAttribute("src"))
            .then(function (base64) {
                imgBase64.push(base64.substring(22));
                //console.log(base64); //处理成功打印在控制台
            }, function (err) {
                console.log(err);//打印异常信息
            });
    }
    function tt() {
        setTimeout(function () {
            if (imgs.length == imgBase64.length) {
                for (var i = 0; i < imgs.length; i++) {
                    img.file(i + imageSuffix[i], imgBase64[i], { base64: true });
                }
                zip.generateAsync({ type: "blob" }).then(function (content) {
                    // see FileSaver.js
                    saveAs(content, "images.zip");
                });
                $('#status').text('处理完成。。。。。');
            } else {
                //console.log('imgs.length:'+imgs.length+',imgBase64.length:'+imgBase64.length);
                $('#status').text('已完成:' + imgBase64.length + '/' + imgs.length);
                tt();
            }
        }, 100);
    }
    tt();
}
//传入图片路径,返回base64
function getBase64(img) {
    function getBase64Image(img, width, height) { //width、height调用时传入具体像素值,控制大小 ,不传则默认图像大小
        var canvas = document.createElement("canvas");
        canvas.width = width ? width : img.width;
        canvas.height = height ? height : img.height;
        var 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));//将base64传给done上传处理
        }
        return deferred.promise();//问题要让onload完成后再return sessionStorage['imgTest']
    }
}
</script>
<img src="https://www.ecshop.cx/images/202005/goods_img/ECSHOP.CX-413_P_1589452188884.gif" />
 <img src="https://www.ecshop.cx/images/201911/goods_img/ECSHOP.CX-59_P_1573937069512.jpg" />
<button onclick="packageImages()">批量图片打包</button><span id="status"></span>

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