JavaScript类型数组:64位整数? [英] JavaScript typed arrays: 64-bit integers?
问题描述
在Firefox 4和Chrome 7中实现的JavaScript类型数组是在JavaScript中存储和处理二进制数据的一种非常有效的方式。但是,当前实现仅提供每个成员最多32位的整数视图,其中 Int32Array
和 Uint32Array
。是否计划实施64位整数视图?如何实现64位整数视图?它们会慢多少?
JavaScript typed arrays, implemented in Firefox 4 and Chrome 7, are a very efficient way of storing and working with binary data in JavaScript. However, the current implementations only provide integer views up to 32 bits per member, with Int32Array
and Uint32Array
. Are 64-bit integer views being planned for implementation? How can I implement 64-bit integer views? How much slower will they be?
推荐答案
没有实用的方法来实现 Int64Array
,因为JavaScript中的所有数字都是64位浮点数字,只有53位精度。就像Simeon在他的评论中所说,你可以使用一个大的整数库,但它会慢得多。
There's no practical way to implement an Int64Array
, because all numbers in JavaScript are 64-bit floating point numbers, which only have 53 bits of precision. Like Simeon said in his comment, you could use a big integer library, but it would be much slower.
如果你真的需要一个64位整数数组,无论如何性能方面,Google Closure库有一个 64位 Long我想象的
类比更通用的大整数库更快。我从来没有使用它,我不知道你是否可以轻松地将它与图书馆的其他部分分开。
If you really need an array of 64-bit integers, regardless of performance, the Google Closure library has a 64-bit Long
class that I would imagine is faster than a more general big integer library. I've never used it though, and I don't know if you can separate it easily from the rest of the library.
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