在 Javascript 中将 Uint8Array 转换为数组

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时间:2020-08-23 03:46:22  来源:igfitidea点击:

Convert Uint8Array to Array in Javascript

javascriptarrays

提问by Kysil Ivan

I have Uint8Array instance that contains binary data of some file.
I want to send data to the server, where it will be deserialized as byte[].
But if I send Uint8Array, I have deserialization error.

我有包含某个文件的二进制数据的 Uint8Array 实例。
我想将数据发送到服务器,在那里它将被反序列化为 byte[]。
但是,如果我发送 Uint8Array,则会出现反序列化错误。

So, I want to convert it to Array, as Array is deserialized well.
I do it as follows:

所以,我想将它转换为 Array,因为 Array 反序列化得很好。
我这样做:

    function uint8ArrayToArray(uint8Array) {
        var array = [];

        for (var i = 0; i < uint8Array.byteLength; i++) {
            array[i] = uint8Array[i];
        }

        return array;
    }

This function works fine, but it is not very efficient for big files.

此功能运行良好,但对于大文件效率不高。

Question: Is there more efficient way to convert Uint8Array --> Array?

问题:有没有更有效的方法来转换 Uint8Array --> Array?

回答by darthmaim

You can use the following in environments that support Array.fromalready (ES6)

您可以在Array.from已经支持(ES6) 的环境中使用以下内容

var array = Array.from(uint8Array)

When that is not supported you can use

如果不支持,您可以使用

var array = [].slice.call(uint8Array)

回答by Vinicio Ajuchan

There is a method of Uint8Array using the prototype (but it only supported by Firefox and Chrome):

有一个使用原型的 Uint8Array 方法(但只支持 Firefox 和 Chrome):

TypedArray.prototype.entries() --> it returns a array.

TypedArray.prototype.entries() --> 它返回一个数组。

Check it out: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/entries

检查一下:https: //developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/entries