ljTempModel = UserModel.init(userName: "sww", userID: 12, phone: "123", email: "deew")  ljTempModel?.ljArray.append("sww")  print("可選綁定前:/(ljTempModel?.ljArray)")   //可選綁定成功，然后賦值  if let modle : UserModel = ljTempModel{     modle.ljArray.append("123")     print("可選綁定后:/(String(describing: ljTempModel?.ljArray))")    print("/(modle.ljArray)可選綁定成功，然后賦值")  //此處modle 和ljTempModel有相同的內存地址空間，所以對modle添加“123”，就相當于對ljTempModel添加“123”，實際打印結果也是如此  }else{   //綁定失敗   print("可選綁定失敗")  } 

import Foundation   open class UserModel : NSObject {  var userName: String  ///< store user's name, optional  var userID: Int   ///< store user's ID  var phone: String?  ///< store user's telephone number  var email: String?  ///< store user's email  var responseData = NSMutableData()  var ljArray = Array<Any>()      // designated initializer  init(userName: String, userID: Int, phone: String?, email: String?) {   self.userName = userName   self.userID = userID   self.phone = phone   self.email = email      super.init()  } }