how to get Hmac code with javascript

I can get a hmac sing using Python as following:

import hmac, base64, hashlib

def make_sign():
    hash_data = "data"
    secret = "this is secret"
    sha512 = hashlib.sha512
    hmac_obj = hmac.new(secret, hash_data, sha512)
    str_hash = hmac_obj.digest()
    sign = base64.b64encode(str_hash)
    hex_hash = hmac_obj.hexdigest()
    hex_sign = base64.b64encode(hex_hash)
    print "correct_sign:",sign
    print "hex_digest_sign:",hex_sign
make_sign()

output:

correct_sign: Lg4pXNCIpitNQt2DLU19qWb+FxdsYZlK4LLncfkTzSidrYoFJLNolUziRqh09B5HyRdCTEP7enZp6/Te34FK1g==
hex_digest_sign: MmUwZTI5NWNkMDg4YTYyYjRkNDJkZDgzMmQ0ZDdkYTk2NmZlMTcxNzZjNjE5OTRhZTBiMmU3NzFmOTEzY2QyODlkYWQ4YTA1MjRiMzY4OTU0Y2UyNDZhODc0ZjQxZTQ3YzkxNzQyNGM0M2ZiN2E3NjY5ZWJmNGRlZGY4MTRhZDY=

but with js, I can get hex_digest_sign, but I need to get correct_sign for web request.

function make_request() {
    hash_data = "data"
    secret = "this is secret"
    hmac = hmac_512(hash_data, secret)
    var sign = $.base64.encode(hmac),
    console.log("js_sign="+sign);
}

function hmac_512(message, secret) {
    var hmac = CryptoJS.algo.HMAC.create(CryptoJS.algo.SHA512, secret);
    hmac.update(message);
    var hash = hmac.finalize();
    return hash;
}

js output:

js_sign="MmUwZTI5NWNkMDg4YTYyYjRkNDJkZDgzMmQ0ZDdkYTk2NmZlMTcxNzZjNjE5OTRhZTBiMmU3NzFmOTEzY2QyODlkYWQ4YTA1MjRiMzY4OTU0Y2UyNDZhODc0ZjQxZTQ3YzkxNzQyNGM0M2ZiN2E3NjY5ZWJmNGRlZGY4MTRhZDY="

the correct sign is

correct_sign: Lg4pXNCIpitNQt2DLU19qWb+FxdsYZlK4LLncfkTzSidrYoFJLNolUziRqh09B5HyRdCTEP7enZp6/Te34FK1g==

how to get it in js?