如何在 Javascript 中存储字节数组 [英] How to store a byte array in Javascript

问题描述

我将在 Javascript 中存储大量字节值(很可能超过一百万).如果我使用带有普通数字的普通数组，则需要 8 MB，因为数字以 IEEE 双精度形式存储，但如果我可以将其存储为字节，则只有 1 MB.

I'm going to be storing a large array of byte values (most likely over a million) in Javascript. If I use a normal array with normal numbers, that will take 8 MB, because numbers are stored as IEEE doubles, but if I can store it as bytes, it will be only 1 MB.

出于显而易见的原因，我想避免浪费那么多空间.有没有办法将字节存储为字节而不是双精度?浏览器兼容性对我来说不是问题，只要它在 Chrome 中工作即可.这是在 HTML5 中，如果这有区别的话.

I'd like to avoid wasting that much space for obvious reasons. Is there a way to store bytes as bytes instead of doubles? Browser compatibility isn't an issue for me, as long as it works in Chrome. This is in HTML5, if that makes a difference.

推荐答案

通过使用 typed数组，您可以存储这些类型的数组:

By using typed arrays, you can store arrays of these types:

<头>

类型	值范围	大小(字节)
Int8Array	-128 到 127	1
Uint8Array	0 到 255	1
Uint8ClampedArray	0 到 255	1
Int16Array	-32768 到 32767	2
Uint16Array	0 到 65535	2
Int32Array	-2147483648 到 2147483647	4
Uint32Array	0 到 4294967295	4
Float32Array	-3.4E38 到 3.4E38	4
Float64Array	-1.8E308 到 1.8E308	8
BigInt64Array	-2^63 到 2^63 - 1	8
BigUint64Array	0 到 2^64 - 1	8

Stack Snippets 中的演示 &JSFiddle

var array = new Uint8Array(100);
array[42] = 10;
console.log(array[42]);

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