javascript 在 JS 中创建二进制 blob
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Create binary blob in JS
提问by user3491456
I'm generating a file client-side, I have the data in hexadecimal and just want to let the user download the generated file.
我正在生成一个文件客户端，我有十六进制数据，只是想让用户下载生成的文件。
var blob = new Blob([hexData], {type: "application/octet-stream"});
console.log(URL.createObjectURL(blob));
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?
生成的文件是一个纯文本文件，其中包含 ASCII 格式的十六进制数据。如何强制 Blob 按原样包含二进制数据而不是文本？
回答by Alan Mimms
Derived from @Musa's solution above so I cannot take credit, but it's clearer to write this as an answer than my lame comment to his answer.
源自上面@Musa 的解决方案，所以我不能相信，但将其写为答案比我对他的答案的蹩脚评论更清楚。
var byteArray = new Uint8Array(hexdata.match(/.{2}/g)
.map(e => parseInt(e, 16)));
var blob = new Blob([byteArray], {type: "application/octet-stream"});
Maybe this is easier to understand? I personally think it is clearer.
也许这更容易理解？个人觉得比较清楚。
回答by Musa
Convert you data to a binary array then create a blob from that.
将您的数据转换为二进制数组，然后从中创建一个 blob。
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"});
