JSON 刚好用上了浏览器已经内置的 JavaScript 语法，所以采用起来几乎没有门槛。 这种实用、优雅的思路，让 JSON 很快被更多开发者接受和推广开来。

The latest JavaScript specification standardizes a well-balanced and thoughtful set of features, including the built-in global Iterator, new Set methods, improvements to regular expressions, and more.