decoder

<!DOCTYPE html>
<html>
<body>

</body>
<script>
        let i = "°MïX¶G«uôĘ¥éo±®~", a = "đ¸IÉÐÏ^ó{ÏcóEês", c = "Ĭ»Ă¾JØ Ğ¥ĭ´Ý¤ï|¹Gáz",
            r = "ğ¦ĈQâ«GĚ£ćGÊQă", d = "æ¼Pċî_ýò¹ĕ^Ö¢";

        function decode(o) {
            for (var e = new String, n = new Array, t = new Array, i = o.length, a = 0; a < i; a++)
                n[a] = o.charCodeAt(a), t[a] = o.charCodeAt(a + 1);
            for (a = 0; a < i; a += 2)
                e += String.fromCharCode(n[a] - t[a]);
            return e
        }

        function encode(o) {
            for (var e = new String, n = new Array, t = new Array, i = o.length, a = 0; a < i; a++)
                n[a] = o.charCodeAt(a), t[a] = o.charCodeAt(a - 1);
            for (a = 0; a < i; a += 2)
                e += String.fromCharCode(n[a] + t[a]);
            return e
        }


        console.log(a);
        let lul = decode(a);
        console.log(lul);
        console.log(encode(lul));
    </script>
</html>