XOR encode decode browser

main.js

const s1 = ``
const s2 = ``


function utf8_to_b64( str ) {
    return btoa(unescape(encodeURIComponent( str )));
}

function b64_to_utf8( str ) {
    return decodeURIComponent(escape(atob( str )));
}

function xor (input, key) {
    let output = ''
    for (let i = 0; i < input.length; i++) {
      output += String.fromCharCode(input.charCodeAt(i) ^ key.charCodeAt(i % key.length))
    }
    return output
}

function encode(text) {
    const messageDecipher = xor(xor(utf8_to_b64(text), s1), s2)
    return utf8_to_b64(messageDecipher)
}
function decode(text) {
    const messageDecipher = b64_to_utf8(xor(xor(b64_to_utf8(text), s2), s1))
    return messageDecipher
}

let text = "wedc"
let enc = encode(text)

console.log(">>>",enc)
console.log("<<<",decode(enc))