Swift2 斯威夫特2号：阿拉莫菲尔号出了问题

我试图执行GET请求，但出现以下两个错误：

使用未解析标识符“self”

及

预期申报

这是我受影响的代码

let credentialData = "\(self._username):\(self._password)".dataUsingEncoding(NSUTF8StringEncoding)!
let base64Credentials = credentialData.base64EncodedStringWithOptions([])
let headers = ["Authorization": "Basic \(base64Credentials)"]
Alamofire.request(.GET, "http://gemcave.pythonanywhere.com/api/order\(self._username)/\(self._password)", headers: headers)
.responseJSON { response in
debugPrint(response)
}

---

您需要将代码放入以下方法中：

func networkConfiguration() {
  let credentialData = "\(self._username):\(self._password)".dataUsingEncoding(NSUTF8StringEncoding)!
  let base64Credentials = credentialData.base64EncodedStringWithOptions([])
  let headers = ["Authorization": "Basic \(base64Credentials)"]
  Alamofire.request(.GET, "http://gemcave.pythonanywhere.com/api/order\(self._username)/\(self._password)", headers: headers)
  .responseJSON { response in
  debugPrint(response)
  }
}