参考:
Globalization 国际化语言
The Ultimate Guide to Multilingual and Multiregional SEO
Tell Google about localized versions of your page
Hreflang: The Easy Guide for Beginners (about x-default)
W3Schools HTML The lang Attribute
苹果官网参考 :
苹果是用 sub folder 来做 Globalization 的哦
Canonical 重复页面
Google: Self-Referencing Canonicals Are Not Critical
上面苹果官网有写一个 canonical self-referencing 目的就是为了 query params for filter 和 UTM 不会影响页面被收入