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你好从ecmascript specifications标识符的ECMAScript规范2017年
UnicodeIDStart::
any Unicode code point with the Unicode property "ID_Start"
UnicodeIDContinue::
any Unicode code point with the Unicode property "ID_Continue"
什么是Unicode的财产 “ID_Start” 和 “ID_Continue”?
https://en.wikipedia.org/wiki/Unicode_character_property – Bergi