调用OCR识别出错 - WXOPEN Club | 微信小程序专业社区

调用腾讯云的OCR识别时，报错了。

var CryptoJS = require('crypto-js');

var now = parseInt(Date.now() / 1000),

rdm = parseInt(Math.random() * Math.pow(2, 32)),

plainText = 'a=' + appid + '&k=' + secretId + '&e=' + (now+pexpired) + '&t=' + now + '&r=' + rdm + userid + '&f=',

data = new Buffer(plainText,'utf8'),

res = CryptoJS.HmacSHA1(data, secretKey);

var

bin = Buffer.concat([res, data]);   //这一句运行时报错了

var sign = bin.toString('base64');

return sign;

694 Uncaught (in promise) TypeError: "list" argument must be an Array of Buffers

不知道是什么原因？求解答！

var hmac = CryptoJS.HmacSHA1(CryptoJS.enc.Utf8.parse(plainText), CryptoJS.enc.Utf8.parse(secretKey))

var sign = CryptoJS.enc.Base64.stringify(hmac.concat(CryptoJS.enc.Utf8.parse(plainText)))

两个值类型不一样