什么是对通过JSON发送64位值的接受的方式？ [英] What is the accepted way to send 64-bit values over JSON?

问题描述

我的一些数据是64位整数。我想送这些到一个页面上运行的JavaScript程序。

Some of my data are 64-bit integers. I would like to send these to a JavaScript program running on a page.

不过，据我所知道的，在大多数JavaScript实现整数为32位有符号的数量。

However, as far as I can tell, integers in most JavaScript implementations are 32-bit signed quantities.

我的两个选择似乎是：

1. 将值作为字符串
2. 发送的值作为64位浮点数

选项（1）不是完美的，但选择（2），似乎远不如完美（数据丢失）。

Option (1) isn't perfect, but option (2) seems far less perfect (loss of data).

你怎样处理这种情况呢？

How have you handled this situation?

推荐答案

这似乎是少了使用JSON和更多的问题与JavaScript本身的问题。什么是你打算如何处理这些数字呢？如果它只是你需要传递回网站以后，通过各种手段简单地使用包含值的字符串魔令牌。如果你确实有做算术的价值，你可能写你自己的JavaScript程序的64位运算。

This seems to be less a problem with JSON and more a problem with Javascript itself. What are you planning to do with these numbers? If it's just a magic token that you need to pass back to the website later on, by all means simply use a string containing the value. If you actually have to do arithmetic on the value, you could possibly write your own Javascript routines for 64-bit arithmetic.

这可以重新present值在Javascript（因此JSON）将是通过把数字成两个32位值的一种方法，例如

One way that you could represent values in Javascript (and hence JSON) would be by splitting the numbers into two 32-bit values, eg.

  [ 12345678, 12345678 ]

要拆分的64位值到2个32位的值，做这样的事情：

To split a 64-bit value into two 32-bit values, do something like this:

  output_values[0] = (input_value >> 32) & 0xffffffff;
  output_values[1] = input_value & 0xffffffff;

然后重新组合两个32位值，以一个64位的值：

Then to recombine two 32-bit values to a 64-bit value:

  input_value = ((int64_t) output_values[0]) << 32) | output_values[1];

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