简单的对称 XOR 加密/解密

function xorEncrypt(plaintext, key) {
    let encrypted = '';
    for (let i = 0; i < plaintext.length; i++) {
        encrypted += String.fromCharCode(plaintext.charCodeAt(i) ^ key.charCodeAt(i % key.length));
    }
    return btoa(encrypted);
}

let key = 'gotojiam';
let plaintext = 'https://www.baidu.com/';
let encrypted = xorEncrypt(plaintext, key);
console.log(encodeURIComponent(encrypted));

//DxsAHxlTTkIQGANBCAgICRJBFwAHRg==

// 解密
function xorDecrypt(encrypted, key) {
    let decoded = atob(encrypted);
    let decrypted = '';
    for (let i = 0; i < decoded.length; i++) {
        decrypted += String.fromCharCode(decoded.charCodeAt(i) ^ key.charCodeAt(i % key.length));
    }
    return decrypted;
}

let key = 'gotojiam';
let encrypted = 'DxsAHxlTTkIQGANBCAgICRJBFwAHRg==';
let decrypted = xorDecrypt(encrypted, key);
console.log(decrypted);