Javascript function() to decrypt Type 7 passwords from Cisco

cisco-decrypt-type7-password.js

function crackPassword(password) {
    var crypttext = password.toUpperCase();
    var plaintext = '';
    var xlate = "dsfd;kfoA,.iyewrkldJKDHSUBsgvca69834ncxv9873254k;fg87";
    var seed, i, val = 0;

    if(crypttext.length & 1)
        return;

    seed = (crypttext.charCodeAt(0) - 0x30) * 10 + crypttext.charCodeAt(1) - 0x30;

    if (seed > 15 || isNaN(crypttext.charAt(0)) || isNaN(crypttext.charAt(1)))
        return;

    for (i = 2 ; i <= crypttext.length; i++) {
        if(i !=2 && !(i & 1)) {
            plaintext += String.fromCharCode(val ^ xlate.charCodeAt(seed++));
            seed %= xlate.length;
            val = 0;
        }

        val *= 16;

        if(!isNaN(crypttext.charAt(i))) {
            val += crypttext.charCodeAt(i) - 0x30;
            continue;
        }

        if(crypttext.charCodeAt(i) >= 0x41 && crypttext.charCodeAt(i) <= 0x46) {
            val += crypttext.charCodeAt(i) - 0x41 + 0x0a;
            continue;
        }

        if(crypttext.length != i)
            return;
    }

    console.log(plaintext);
    return plaintext;
}

I Don't know why but I'm not getting a log.

I Know the encryption/decryption algorithm. I have built it up in python. But I want in JS. Please help me.