javascript - codePointAt 和 charCodeAt 的区别

Question

String.prototype.codePointAt() 和有什么区别和 String.prototype.charCodeAt()在 JavaScript 中？

'A'.codePointAt(); // 65
'A'.charCodeAt();  // 65

Answer 1

来自 charCodeAt 上的 MDN 页面:

The charCodeAt() method returns an integer between 0 and 65535 representing the UTF-16 code unit at the given index.

The UTF-16 code unit matches the Unicode code point for code points which can be represented in a single UTF-16 code unit. If the Unicode code point cannot be represented in a single UTF-16 code unit (because its value is greater than 0xFFFF) then the code unit returned will be the first part of a surrogate pair for the code point. If you want the entire code point value, use codePointAt().

TLDR；

charCodeAt() 是 UTF-16

codePointAt() 是 统一码 .