ljTempModel = UserModel.init(userName: "sww", userID: 12, phone: "123", email: "deew") 
 ljTempModel?.ljArray.append("sww") 
 print("可选绑定前:\(ljTempModel?.ljArray)") 
 
 //可选绑定成功，然后赋值 
 if let modle : UserModel = ljTempModel{ 
  
  modle.ljArray.append("123") 
  
  print("可选绑定后:\(String(describing: ljTempModel?.ljArray))") 
 
  print("\(modle.ljArray)可选绑定成功，然后赋值") 
 //此处modle 和ljTempModel有相同的内存地址空间，所以对modle添加“123”，就相当于对ljTempModel添加“123”，实际打印结果也是如此 
 }else{ 
  //绑定失败 
  print("可选绑定失败") 
 } 

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() 
 } 
}