创建JS二进制数据 [英] Create binary blob in JS

问题描述

我生成一个文件的客户端，我在十六进制数据，只想让用户下载生成的文件。

I'm generating a file client-side, I have the data in hexadecimal and just want to let the user download the generated file.

var blob = new Blob([hexData], {type: "application/octet-stream"});
console.log(URL.createObjectURL(blob));

得到的文件是一个包含ASCII十六进制数据的纯文本文件。我怎么能强迫的Blob包含二进制数据，而不要作为文本？

The resulting file is a plain-text file containing hex data in ASCII. How can I force the Blob to contain the binary data as is and not as text?

推荐答案

转换你的数据二进制数组，然后创建从一个blob。

Convert you data to a binary array then create a blob from that.

var byteArray = new Uint8Array(hexdata.length/2);
for (var x = 0; x < byteArray.length; x++){
    byteArray[x] = parseInt(hexdata.substr(x*2,2), 16);
}
var blob = new Blob([byteArray], {type: "application/octet-stream"});

http://jsfiddle.net/mowglisanu/15h9o3d5/

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