qt md5加密，base64編碼解碼
md5加密
QByteArray data = "12121221";
data += "asdfas";
QByteArray rels = QCryptographicHash::hash(data, QCryptographicHash::Md5);
qDebug() << rels;
qDebug() << rels.toHex();
base64編碼解碼
QByteArray base = "你好d，fあいうえおaa";
//base64編碼
base = base.toBase64();
qDebug() << base;
//base64解碼
base = QByteArray::fromBase64(base);
qDebug() << base.data();
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