主题： i18n

• 适应语言区域的界面：Intl 复数规则、日期与从右向左布局

  使用浏览器的 Intl 对象格式化数字、日期和相对时间，而不是手工操作字符串；按 Intl.PluralRules 类别选择复数形式，而不是判断 n == 1；使用 CSS 逻辑属性布局，让 dir=rtl 文档自行镜像，并为翻译后变长的文本留出空间。

  methodology · zh · reviewed · 知识截至 2026-09-16

• Country and currency codes in data: ISO 3166-1 and ISO 4217 without the surprises

  Store countries as ISO 3166-1 alpha-2 codes and currencies as ISO 4217 alpha-3 codes with their minor-unit exponent, keep the code tables versioned because entries change, and never derive one from the other: a country has no single language or currency, and codes such as UK or XXX are traps.

  article · en · reviewed · 知识截至 2026-09-16

机器可读： JSON