遇到问题是在微信小程序里面(当然和网页的js也是一样)，都是使用库CryptoJS。发现它默认输出是16进制，但是服务器解析时候是需要Base64的。

可以到第三方网站测试 http://tool.chacuo.net/cryptaes

加密模式:CBC
填充pkcs7或pkcs5
key = "keykeykeykeykeyk";
iv = '1234567887654321';
str ="这是测试数据";
hex结果"890645269898FC89010F7651372C0F38817DD57BAA12552EFAF418398F3E08CA"
base64结果"iQZFJpiY/IkBD3ZRNywPOIF91XuqElUu+vQYOY8+CMo="
解决需要转成Base64的解决方法:
var fun_aes = require('../../utils/libs/aes.js')
var key = fun_aes.CryptoJS.enc.Utf8.parse("keykeykeykeykeyk");
var iv = fun_aes.CryptoJS.enc.Utf8.parse('1234567887654321');
function AES_Encrypt(word) {
  var srcs = fun_aes.CryptoJS.enc.Utf8.parse(word);
  var encrypted = fun_aes.CryptoJS.AES.encrypt(srcs, key, { iv: iv, mode: fun_aes.CryptoJS.mode.CBC, padding: fun_aes.CryptoJS.pad.Pkcs7 });
  var hexStr = encrypted.ciphertext.toString().toUpperCase();
  console.log('hexStr->' + hexStr);
  var oldHexStr = fun_aes.CryptoJS.enc.Hex.parse(hexStr);
  // 将密文转为Base64的字符串
  var base64Str = fun_aes.CryptoJS.enc.Base64.stringify(oldHexStr);
  console.log('base64Str->' + base64Str);
//这里根据需求返回 base64Str 或 hexStr(解密时有小小差别)
  return hexStr;
 var srcs = word;
//若上面加密返回的hexStr,需打开下面两行注释，再次处理
 //var encryptedHexStr = fun_aes.CryptoJS.enc.Hex.parse(word);
 // var srcs = fun_aes.CryptoJS.enc.Base64.stringify(encryptedHexStr);
  var decrypt = fun_aes.CryptoJS.AES.decrypt(srcs, key, { iv: iv, mode: fun_aes.CryptoJS.mode.CBC, padding: fun_aes.CryptoJS.pad.Pkcs7 });
  var decryptedStr = decrypt.toString(fun_aes.CryptoJS.enc.Utf8);
  var value = decryptedStr.toString();
  console.log('value->'+value);
  return value;