zip - 如何使用 zip.js 将多个文件添加到一个 zip 中？

Question

我正在使用 javascript zip.js图书馆。我到处搜索，但找不到将多个文件添加到 zip 的示例。

这是我的代码，但它生成了一个“损坏的”zip。

var len = results.rows.length, i;
var k=1;
zip.createWriter(new zip.BlobWriter(), function(writer) {
    for (i = 0; i < len; i++){
        // get the image url from a sqlite request
        url = results.rows.item(i).url;


        var img = new Image();
        img.onload = function() {
            var a = document.createElement('a');
            a.href = this.src;
            var filename= a.pathname.split('/').pop(); // filename.php
            timest = new Date().getTime();
            // use a TextReader to read the String to add

                writer.add(timest+".jpg", new zip.Data64URIReader(getBase64Image(img)), function() {
                // onsuccess callback
                    k++;
                    if(k==len){
                        setTimeout(function(){
                        writer.close(function(blob) {

                            // blob contains the zip file as a Blob object
                            $('#test').attr("href", window.URL.createObjectURL(blob));
                            $('#test').attr("download", "woeii.zip");

                        });
                        },1000);
                    }
                }, function(currentIndex, totalIndex) {
                // onprogress callback
                });



        };
        img.src = url;
    }
});

有什么让它发挥作用的想法吗？ :)

Answer 1

如果您正在寻找处理多个文件的代码示例，see here .然后你可以 view the source code .

这是演示的主要来源(略有修改):

var obj = this;
var model = (function() {
    var zipFileEntry, zipWriter, writer, creationMethod, URL = obj.webkitURL || obj.mozURL || obj.URL;

    return {
        setCreationMethod : function(method) {
            creationMethod = method;
        },
        addFiles : function addFiles(files, oninit, onadd, onprogress, onend) {
            var addIndex = 0;

            function nextFile() {
                var file = files[addIndex];
                onadd(file);
                // Modified here to use the Data64URIReader instead of BlobReader
                zipWriter.add(file.name, new zip.Data64URIReader(file.data), function() {
                    addIndex++;
                    if (addIndex < files.length)
                        nextFile();
                    else
                        onend();
                }, onprogress);
            }

            function createZipWriter() {
                zip.createWriter(writer, function(writer) {
                    zipWriter = writer;
                    oninit();
                    nextFile();
                }, onerror);
            }

            if (zipWriter)
                nextFile();
            else if (creationMethod == "Blob") {
                writer = new zip.BlobWriter();
                createZipWriter();
            } else {
                createTempFile(function(fileEntry) {
                    zipFileEntry = fileEntry;
                    writer = new zip.FileWriter(zipFileEntry);
                    createZipWriter();
                });
            }
        },
        getBlobURL : function(callback) {
            zipWriter.close(function(blob) {
                var blobURL = creationMethod == "Blob" ? URL.createObjectURL(blob) : zipFileEntry.toURL();
                callback(blobURL);
                zipWriter = null;
            });
        },
        getBlob : function(callback) {
            zipWriter.close(callback);
        }
    };
})();

用法:假设 <a id="downloadLink">Download</a>元素存在以在准备就绪后提供下载。

// Prepare your images
var files = [];
for (i = 0; i < len; i++) {

    // Get the image URL from a SQLite request
    var url = results.rows.item(i).url;

    (function(url){
        var img = new Image();
        img.onload = function() {
            // Add to file array [{name, data}]
            var a = document.createElement('a');
            a.href = this.src;
            var filename= a.pathname.split('/').pop();

            console.log("Loaded file " + filename);
            files.push({name: filename, data: getBase64Image(img) });
        }
        img.src = url;
    })(url);
}

// Wait for the image to load
var check = setInterval(function(){
    if(files.length==images.length) {
        clearInterval(check);

        // Set the mode
        model.setCreationMethod("Blob");

        // Add the files to the zip
        model.addFiles(files, 
            function() {
                // Initialise Method
                console.log("Initialise");
            }, function(file) {
                // OnAdd
                console.log("Added file");
            }, function(current, total) {
                // OnProgress
                console.log("%s %s", current, total);
            }, function() {
                // OnEnd
                // The zip is ready prepare download link
                // <a id="downloadLink" href="blob:url">Download Zip</a>
                model.getBlobURL(function(url) {
                    document.getElementById("downloadLink").href = url;
                    document.getElementById("downloadLink").style.display = "block";
                    document.getElementById("downloadLink").download = "filename.zip";
                });
            });

    }
}, 500);

您可以使用示例源代码添加进度指示器。希望这会有所帮助，这种方法的好处是，如果您将其设为自己的 JS 文件，则 zip 模型很容易重用。

---

另一个想法:我假设你正在使用 getBase64Image函数 from here ，如果是这样并且您仍然遇到损坏问题，也许尝试将返回修改为简单的 return dataURL;并注释掉 .replace(... , 作为 Data64URIReader可能需要前缀。