ios获取IMSI

• (NSString *)getIMSI{

  CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];

  CTCarrier *carrier = [info subscriberCellularProvider];

  NSString mcc = [carrier mobileCountryCode];
  NSString mnc = [carrier mobileNetworkCode];

  NSString *imsi = [NSString stringWithFormat:@"%@%@", mcc, mnc];

  return imsi;
  }

谁能把这段oc 转成 native.js

            var CTTelephonyNetworkInfo = plus.ios.importClass("CTTelephonyNetworkInfo");  
                var info = new CTTelephonyNetworkInfo();  
                var CTCarrier = plus.ios.importClass("CTCarrier");  
                var CTCarrier  = plus.ios.newObject("CTCarrier");  
                var carrier = info.plusGetAttribute("subscriberCellularProvider");  

我到这一步 就报错 carrier 是 undefined