可以引用 JSON 数字吗? [英] Can JSON numbers be quoted?

问题描述

JSON 数字周围可以有引号吗?在大多数搜索链接中，数字似乎并不需要"引号.但是，解析器是否应该同时接受 "attr" : 6 和 "attr" : "6" ?

Can there be quotes around JSON numbers? In most of the search links, it seems that numbers do not "require" quotes. But, should the parsers accept both "attr" : 6 and "attr" : "6"?

如果 MyParser 有一个方法 getInt 来获取给定键的数字，MyParser.getInt("attr") 应该返回 6 在这两种情况下，还是在后一种情况下抛出异常?

If MyParser has a method getInt to get a number given the key, should MyParser.getInt("attr") return 6 in both cases, or throw an exception in the latter case?

推荐答案

In JSON, 6 是数字六.6" 是一个包含 digit 6 的字符串.所以问题的答案可以引用 json 数字吗?" 基本上是不，"因为如果你把它们放在引号中，它们就不再是数字了.

In JSON, 6 is the number six. "6" is a string containing the digit 6. So the answer to the question "Can json numbers be quoted?" is basically "no," because if you put them in quotes, they're not numbers anymore.

但是，如果解析器同时接受 "attr": 6 和 "attr";:6"?

But, should the parsers accept both "attr" : 6 and "attr" : "6"?

是的，但它们定义了不同的东西.第一个定义了一个 attr 属性，其值为 6(一个数字).第二个定义了一个 attr 属性，其值为 6"(一个包含单个数字的字符串).

Yes, but they define different things. The first defines an attr property with the value 6 (a number). The second defines an attr property with the value "6" (a string containing a single digit).

(最初询问的问题是关于 attr: 6"，这是无效的，因为属性名称在 JSON 中必须用双引号引起来.)

(The question originally asked about attr: "6", which is invalid because property names must be in double quotes in JSON.)

如果 MyParser 有一个方法 getInt 来获取给定键的数字，那么 MyParser.getInt(attr") 在这两种情况下都应该返回 6 还是在后一种情况下抛出异常?

If MyParser has a method getInt to get a number given the key, should MyParser.getInt("attr") return 6 in both the cases or throw an exception in the latter case?

这是提供解析器的人的设计决定，基本上是在 getInt 严格(如果您在 "attr" 上尝试时抛出异常:"6") 或松散的(将 6" 强制转换为 6 并返回).JavaScript 通常是松散的，因此可能存在松散的争论；相反，JavaScript 松散的事实有时会导致麻烦，这可能是严格的一个论据.

That's a design decision for the person providing the parser, basically the choice between getInt being strict (throwing an exception if you try it on "attr": "6") or loose (coercing "6" to 6 and returning that). JavaScript is usually loose, and so there could be an argument for being loose; conversely, the fact that JavaScript is loose sometimes causes trouble, which could be an argument for being strict.

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