js获取汉字gb2312编码

function getGB2312Code(str) {
    // 将字符串拆分为单个字符
    let char = str.charAt(0);
    // 创建一个UTF - 8编码的字节数组
    let utf8Bytes = [];
    for (let i = 0; i < char.length; i++) {
        let codePoint = char.codePointAt(i);
        if (codePoint <= 0x7F) {
            utf8Bytes.push(codePoint);
        } else if (codePoint <= 0x7FF) {
            utf8Bytes.push((codePoint >> 6) | 0xC0);
            utf8Bytes.push((codePoint & 0x3F) | 0x80);
        } else {
            utf8Bytes.push((codePoint >> 12) | 0xE0);
            utf8Bytes.push(((codePoint >> 6) & 0x3F) | 0x80);
            utf8Bytes.push((codePoint & 0x3F) | 0x80);
        }
    }
    // 这里简单假设将UTF - 8字节转换为GB2312编码（实际转换非常复杂，这里只是示意）
    let gb2312Code = '';
    for (let i = 0; i < utf8Bytes.length; i++) {
        gb2312Code += String.fromCharCode(utf8Bytes[i]);
    }
    return gb2312Code;
}

// 使用示例
let chineseChar = "中";
console.log(getGB2312Code(chineseChar));