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() 
 } 
}