JavaScript 解析函数 JSON.parse 未按预期工作

Question

The case:

var s = '{"a": 2}';
var d = JSON.parse(s); // d = Object {a: 2}

It is OK.

The similar case does not parse string, however. Why?

var s = "{'a': 2}";

var d= JSON.parse(s) // Uncaught SyntaxError: Unexpected token ' in JSON at position 1

Expected result - parsed object like in the first case. It should have worked because ' and " are interchangeable in javascript.

Answer 1

根据标准，你需要双引号来表示一个字符串，它是一个键。

Answer 2

It should have worked because ' and " are interchangeable in javascript.

JSON is not JavaScript.

JSON strings must be delimited with quotation marks, not apostrophes.

See the specification :

A string begins and ends with quotation marks.