encryption use objective-c and decryption use node.js

I encryption string use objective-c, and use node.js decrypton,but it's not work.

this objective-c code:

NSString *planText = @"Hello World";

NSString *secrectKey = [@"key" SHA256];

NSString *token = [planText AES256EncryptWithKey:secrectKey];

It's output : QV44yFoYVNdPVHA21Fzq7g==

AES256EncryptWithKey this method code is here.

this node.js code:

var crypto = require('crypto');

function decode(cryptkey, secretdata) {
    var 
    decipher = crypto.createDecipher('aes-256-cbc', cryptkey),
    decoded  = decipher.update(secretdata, 'base64', 'utf8');

    decoded += decipher.final( 'utf8' );
    return decoded;
}

var cryptkey   = crypto.createHash('sha256').update('key').digest();
decode(cryptkey,'QV44yFoYVNdPVHA21Fzq7g==');

but node.js code not output 'Hello World'.