Javascript charCodeAt 和 fromCharCode 不返回相同的值

Question

我有一个使用非常特定字体的 Unicode 字符。
我需要取那个字符的代码，加上 8，然后把它转换回一个字符串。
这是有效的python代码:

char = "񂇁"
char == chr(ord(char)) # True

但是，在 Javascript 中，使用匹配函数，它不能正确转换回来:

const char = "񂇁";
char == String.fromCharCode("񂇁".charCodeAt(0)) // false

Answer 1

当您使用来自 Unicode 星体平面的字符时，这就是您所需要的:

const char = "񂇁";
console.log(char === String.fromCodePoint("񂇁".codePointAt(0)));

也可以看看:
The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)
What every JavaScript developer should know about Unicode
JavaScript has a Unicode problem
Unicode-aware regular expressions in ES2015
ES6 Strings (and Unicode, ❤) in Depth
JavaScript for impatient programmers. Unicode – a brief introduction