code: function (bytes) {
                  var str = '';
                  for (var i = 0, l = bytes.length; i < l; i++) {
                      if (bytes[i] < 0x7F) {
                          str += String.fromCharCode(bytes[i]);
                      }
                      else {
                          str += '%' + (256 + bytes[i]).toString(16).slice(1);
                      }
                  }
  
                  return unescape(str);
              }
docs: utf8字节转字符串
  
  @param {Array} bytes 字节
  @return {string} 字符串