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() (en-US)

实例化一个 Locale 对象。

Intl.Locale.prototype.baseName (en-US)

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

Intl.Locale.prototype.calendar (en-US)

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

Intl.Locale.prototype.caseFirst (en-US)

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

Intl.Locale.prototype.collation (en-US)

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

Intl.Locale.prototype.hourCycle (en-US)

Returns the time keeping format convention used by the locale.

Intl.Locale.prototype.language (en-US)

Returns the language associated with the locale.

Intl.Locale.prototype.numberingSystem (en-US)

Returns the numeral system used by the locale.

Intl.Locale.prototype.numeric (en-US)

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

Intl.Locale.prototype.region (en-US)

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

Intl.Locale.prototype.script (en-US)

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

Intl.Locale.prototype.maximize() (en-US)

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

Intl.Locale.prototype.minimize() (en-US)

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

Intl.Locale.prototype.toString() (en-US)

Returns the Locale's full locale identifier string.

很简单，就是需要给Intl.Locale (en-US) 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 (en-US) 属性，用于设置您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