如何将Unicode字符转换为其ASCII等效字符

unicode_string = "你好，世界！"
ascii_string = unicode_string.encode('ascii', 'ignore').decode('ascii')
print(ascii_string)

String unicodeString = "你好，世界！";
String asciiString = null;

try {
    asciiString = new String(unicodeString.getBytes("UTF-8"), "ASCII");
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
}

System.out.println(asciiString);

const unicodeString = "你好，世界！";
const asciiString = unicodeString.split('').map(c => c.charCodeAt(0) <= 127 ? c : '').join('');
console.log(asciiString);