用js下载php生成的存折

Question

我需要下载一个用 js（角度应用程序）中的 php 脚本创建的存折文件，我试图使用这个库 http://danml.com/download.html

我在服务器端使用此代码：

header('Pragma: no-cache');
header('Content-type: application/vnd.apple.pkpass');
header('Content-Disposition: attachment; filename="card.pkpass"');

echo base64_encode($this->pass_outputfile);

客户端的这个：

var filename = responseInfo.headers["content-disposition"].indexOf("filename=");
filename = responseInfo.headers["content-disposition"].substring(filename+9);

var mime = responseInfo.headers["content-type"];

download(window.atob(response), filename.replace(/\"/g,''), mime);

下载开始良好，但 pkpass 文件无效...似乎文件被压缩了 2 次...有人可以告诉我为什么吗？

Answer 1

好吧，我终于用这个函数将base64解码为一个blob了，

function base64toBlob(base64Data, contentType) {
    contentType = contentType || '';
    var sliceSize = 1024;
    var byteCharacters = atob(base64Data);
    var bytesLength = byteCharacters.length;
    var slicesCount = Math.ceil(bytesLength / sliceSize);
    var byteArrays = new Array(slicesCount);

    for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
        var begin = sliceIndex * sliceSize;
        var end = Math.min(begin + sliceSize, bytesLength);

        var bytes = new Array(end - begin);
        for (var offset = begin, i = 0 ; offset < end; ++i, ++offset) {
            bytes[i] = byteCharacters[offset].charCodeAt(0);
        }
        byteArrays[sliceIndex] = new Uint8Array(bytes);
    }
    return new Blob(byteArrays, { type: contentType });
}

然后就使用下载功能

download(base64toBlob(response,"application/vnd.apple.pkpass"), filename.replace(/\"/g,''), mime);