Javascript ASCIIコードの変換

文字→ASCII

str.charCodeAt(index)

const sentence = 'The quick brown fox jumps over the lazy dog.';

const index = 4;

console.log(`The character code ${sentence.charCodeAt(index)} is equal to ${sentence.charAt(index)}`);
// expected output: "The character code 113 is equal to q"

ASCII→文字

String.fromCharCode(code)

String.fromCharCode(65, 66, 67);  // "ABC"
String.fromCharCode(0x2014)       // "—"
String.fromCharCode(0x12014)      // 숫자 '1'은 무시해서 "—"

参照URL