Intl.Locale

Intl.Locale 对象是为了更便捷地处理 Unicode 区域设置。Unicode 使用字符串作为区域识别标识。区域标识符由语言标识符和扩展标记组成。语言标识符是区域 (locale) 的核心，包含了语言、脚本和地域子标记 (region subtags)。有关区域设置的其他信息体现在可选的扩展标记中。扩展标记保存有关区域设置方面的信息，例如日历类型、时钟类型和编号系统类型。

传统上，Intl 接口像 Unicode 一样使用字符串来表示区域设置，这是一个简单而轻量且效果好的解决方案。但是，添加一个 Locale 类可以更容易地解析和操作语言、脚本、区域以及扩展标记。

Intl.Locale()

实例化一个 Locale 对象。

Intl.Locale.prototype.baseName

Returns basic, core information about the Locale in the form of a substring of the complete data string.

Intl.Locale.prototype.calendar

Returns the part of the Locale that indicates the Locale's calendar era.

Intl.Locale.prototype.caseFirst

Returns whether case is taken into account for the locale's collation rules.

Intl.Locale.prototype.collation

Returns the collation type for the Locale, which is used to order strings according to the locale's rules.

Intl.Locale.prototype.hourCycle

Returns the time keeping format convention used by the locale.

Intl.Locale.prototype.language

Returns the language associated with the locale.

Intl.Locale.prototype.numberingSystem

Returns the numeral system used by the locale.

Intl.Locale.prototype.numeric

Returns whether the locale has special collation handling for numeric characters.

Intl.Locale.prototype.region

Returns the region of the world (usually a country) associated with the locale.

Intl.Locale.prototype.script

Returns the script used for writing the particular language used in the locale.

Intl.Locale.prototype.maximize()

Gets the most likely values for the language, script, and region of the locale based on existing values.

Intl.Locale.prototype.minimize()

Gets the most likely values for the language, script, and region of the locale based on existing values.

Intl.Locale.prototype.toString()

Returns the Locale's full locale identifier string.

很简单，就是需要给Intl.Locale 构造函数传入一个 locale 标识字符串作为参数：

let us = new Intl.Locale("zh-Hans-CN");

构造函数支持传入 object 作为配置，object 中可包含多个配置属性。例如，设置 hourCycle 属性，用于设置你所需要的小时周期类型：

let zh12hour = new Intl.Locale("zh-Hans-CN", { hourCycle: "h12" });
console.log(zh12hour.hourCycle); // Prints "h12"

• The Intl.Locale Polyfill