Intl 国际化

Node.js 有很多特性可以让编写国际化程序变得更容易。 它们之中有一些是：

• ECMAScript 语言规范中的区域设置敏感或 Unicode 感知函数：
  • String.prototype.normalize()
  • String.prototype.toLowerCase()
  • String.prototype.toUpperCase()
• ECMAScript 国际化 API 规范（又名 ECMA-402）中描述的所有功能：
  • Intl 对象
  • 像 String.prototype.localeCompare() 和 Date.prototype.toLocaleString() 这样的区域敏感方法
• WHATWG 网址解析器的国际化域名（IDN）支持
• require('buffer').transcode()
• 更准确的交互式解释器行编辑
• require('util').TextDecoder
• RegExp Unicode 属性转义

Node.js has many features that make it easier to write internationalized programs. Some of them are:

• Locale-sensitive or Unicode-aware functions in the ECMAScript Language Specification:
  • String.prototype.normalize()
  • String.prototype.toLowerCase()
  • String.prototype.toUpperCase()
• All functionality described in the ECMAScript Internationalization API Specification (aka ECMA-402):
  • Intl object
  • Locale-sensitive methods like String.prototype.localeCompare() and Date.prototype.toLocaleString()
• The WHATWG URL parser's internationalized domain names (IDNs) support
• require('buffer').transcode()
• More accurate REPL line editing
• require('util').TextDecoder
• RegExp Unicode Property Escapes

Node.js (and its underlying V8 engine) uses ICU to implement these features in native C/C++ code. However, some of them require a very large ICU data file in order to support all locales of the world. Because it is expected that most Node.js users will make use of only a small portion of ICU functionality, only a subset of the full ICU data set is provided by Node.js by default. Several options are provided for customizing and expanding the ICU data set either when building or running Node.js.