js utf8 byte

// 将字符串转换为UTF-8字节序列
function stringToUtf8Bytes(str) {
    const utf8 = unescape(encodeURIComponent(str));
    const bytes = new Uint8Array(utf8.length);
    for (let i = 0; i < utf8.length; i++) {
        bytes[i] = utf8.charCodeAt(i);
    }
    return bytes;
}

// 将UTF-8字节序列转换回字符串
function utf8BytesToString(bytes) {
    const utf8String = String.fromCharCode.apply(null, bytes);
    return decodeURIComponent(escape(utf8String));
}

// 示例使用
const originalString = "你好，世界！";
const utf8Bytes = stringToUtf8Bytes(originalString);
console.log("UTF-8 Bytes:", utf8Bytes);

const recoveredString = utf8BytesToString(utf8Bytes);
console.log("Recovered String:", recoveredString);