如何将 HTML 实体（十六进制）转换为 UTF-16（两对十六进制）

Question

如何将 html 实体 😍 转换为 JavaScript 中的 \uD83D\uDE0D？ （反应本机）（表情符号）

Answer 1

这个he库可以解码

import { decode } from 'he';

decode('😍') // outputs 

Answer 2

尝试String.fromCodePoint(...)

String.fromCodePoint(42);       // "*"
String.fromCodePoint(65, 90);   // "AZ"
String.fromCodePoint(0x404);    // "\u0404"
String.fromCodePoint(0x2F804);  // "\uD87E\uDC04"
String.fromCodePoint(194564);   // "\uD87E\uDC04"
String.fromCodePoint(0x1D306, 0x61, 0x1D307) // "\uD834\uDF06a\uD834\uDF07"

String.fromCodePoint('_');      // RangeError
String.fromCodePoint(Infinity); // RangeError
String.fromCodePoint(-1);       // RangeError
String.fromCodePoint(3.14);     // RangeError
String.fromCodePoint(3e-2);     // RangeError
String.fromCodePoint(NaN);      // RangeError

String.fromCodePoint() MDN Doc