You didn't listen to the comments of GregS, so I'll do all the work for you:
HTML of Fiddle:
and the JavaScript that solves the issue, basically just the comment of GregS and an output function.
function out() {
var args = Array.prototype.slice.call(arguments, 0);
document.getElementById('output').innerHTML += args.join("") + "\n";
}
out("decrypted text: ");
var base64Key = "QWJjZGVmZ2hpamtsbW5vcA==";
var key = CryptoJS.enc.Base64.parse(base64Key);
var decryptedData = CryptoJS.AES.decrypt("lxbdRfoav/6UW/yZtuQM9X1qaI7qZLyuPWgmwPkti/Ayl4CpiPEAMklpaq74BU/U/MxxLgDz4CMs/jm9xzATMFyHOAvObkrnHwydC4PKsej1mqZsgYyQ4qDeKk6on/fdkkLLRMkIFYyBXRTLb/Q1Y85jzbRTOpTG50EjOxMZFlQ=", key, {
mode: CryptoJS.mode.ECB,
padding: CryptoJS.pad.Pkcs7
});
var decryptedText = decryptedData.toString(CryptoJS.enc.Utf8);
out("decryptedText = " + decryptedText);
You can run the fiddle here and you can find the hints with regards to the output here.