http://www.unicode.org/

Unicode Technical Reports

• UNICODE LINE BREAKING ALGORITHM - http://unicode.org/reports/tr14/

http://www.charbase.com/

Unicode的 U+D800 U+DFFF 不占用字符

U+010000 ~ U+10FFFF - ES6:

\uD83D \uDCA9

  ==

\u{1F4A9}

H = Math.floor((C - 0x10000) / 0x400) + 0xD800
L = (C - 0x10000) % 0x400 + 0xDC00

C = (H - 0xD800) * 0x400 + L - 0xDC00 + 0x10000

• https://mothereff.in/js-escapes#1%F0%9D%8C%86
• https://github.com/mathiasbynens/jsesc

JavaScript’s internal character encoding: UCS-2 or UTF-16? - https://mathiasbynens.be/notes/javascript-encoding