文件 在 javascript / Extjs 中将字节数组下载为文件

File download a byte array as a file in javascript / Extjs

在我的 Ext Js 解决方案中,我正在调用一个返回此 JSON 格式的服务

{"success":true,"filename":"spreadsheet.xlsx","file":[80,75,3,4,20,0,...(many more)]}

如何使用文件名和字节数组(文件)的内容制作文件下载对话框?

更新

所以我找到了这个位来开始下载

var a = window.document.createElement('a');
                    a.href = window.URL.createObjectURL(new Blob(data.file, { type: 'application/octet-stream' }));
                    a.download = data.filename;

                    // Append anchor to body.
                    document.body.appendChild(a)
                    a.click();

                    // Remove anchor from body
                    document.body.removeChild(a)

目前还不错

但是我得到的文件已损坏所以我怀疑我需要 Encode/Decode 文件变量?

我必须先将文件转换为 Uint8Array,然后再将其传递给 Blob

var arr = data.file;
var byteArray = new Uint8Array(arr);
var a = window.document.createElement('a');

a.href = window.URL.createObjectURL(new Blob([byteArray], { type: 'application/octet-stream' }));
a.download = data.filename;

// Append anchor to body.
document.body.appendChild(a)
a.click();


// Remove anchor from body
document.body.removeChild(a)

阅读此答案很有帮助

基于 Jepzen 的响应,我能够使用此技术从浏览器中的 AWS S3 下载文档。 +1 杰普森

s3.getObject(params, function(err, data) {
      if (err === null) {
         var arr = data.Body;
         var byteArray = new Uint8Array(arr);
         var a = window.document.createElement('a');

         a.href = window.URL.createObjectURL(new Blob([byteArray], { type: 'application/octet-stream' }));
         a.download = fName; //fName was the file name portion of the key what was passed in as part of the key value within params. 

         // Append anchor to body.
         document.body.appendChild(a)
         a.click();

         // Remove anchor from body
         document.body.removeChild(a)
      } else {
        result = 'failure'
         console.log("Failed to retrieve an object: " + err);
      }
});