javascript 有没有办法用 XMLHttpRequest 对象发送二进制数据？
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Is there any way to send binary data with XMLHttpRequest object?
提问by duganets
I'am trying to send binary chunk with XMLHttpRequest
我正在尝试使用 XMLHttpRequest 发送二进制块
var xhr = new XMLHttpRequest();
var bindata = 0x0f0f;
xhr.open("POST", "binary_reader.php");
xhr.send(bindata);
But this approach not works. I've tried to provide Content-type: application/octet-stream, Content-encodingheaders for xhrand they don't work either. I am suspect that there is no way to compose request of such kind.
但这种方法行不通。我试图为xhr提供Content-type: application/octet-stream、Content-encoding标头，但它们也不起作用。我怀疑没有办法编写这种请求。
I would appreciate any help.
我将不胜感激任何帮助。
回答by Bo Lu
XMLHttpRequest.sendAsBinaryis obsolete. Link
XMLHttpRequest.sendAsBinary已过时。关联
As MDN mentioned, you can directly send binary typed array:
正如MDN 提到的，你可以直接发送二进制类型的数组：
var myArray = new ArrayBuffer(512);
var longInt8View = new Uint8Array(myArray);
// generate some data
for (var i=0; i< longInt8View.length; i++) {
longInt8View[i] = i % 256;
}
var xhr = new XMLHttpRequest;
xhr.open("POST", url, false);
xhr.send(myArray);
回答by Aadit Shah
Yes you can send binary data using XHR. All you need to do is set the appropriate headers and mime-type, and call the sendAsBinary method instead of the simple send method. For example:
是的，您可以使用 XHR 发送二进制数据。您需要做的就是设置适当的标头和 MIME 类型，并调用 sendAsBinary 方法而不是简单的 send 方法。例如：
var req = new XMLHttpRequest();
req.open("POST", url, true);
// set headers and mime-type appropriately
req.setRequestHeader("Content-Length", 741);
req.sendAsBinary(aBody);
回答by Samuel Zhang
W3C has introduced Blob type to XMLHttpRequest in the latest specification. Currently I haven't seen any implementation so far but in near future this is definitely the way to download and upload binary data with XMLHttpRequest.
W3C 在最新的规范中为 XMLHttpRequest 引入了 Blob 类型。目前我还没有看到任何实现，但在不久的将来，这绝对是使用 XMLHttpRequest 下载和上传二进制数据的方式。
