JSオブジェクトの作成と継承

<script type="text/javascript">
		//   javascript              
		/*1：                
			//               
			var obj = new Object();// object            
			obj.name = "zhang san";
			obj["age"] = 20; //      obj      age   
			alert(obj.name);
			alert(obj.age);
			delete obj.name; //      
			alert(obj.name);
			alert(obj.age);
			obj.sayName = function(name){ //      obj        
				this.name = name;
				alert(this.name);
			}
			obj.sayName("lisi");
		*/
		/*
		2:           
			var obj = {username:"zhangsan",password:"12345"};
			alert(obj.username);
		*/
		
		/*
		3:         
		function createObject(){
			var object = new Object();
			object["name"] = "zhangshan";
			object.password = "1234";
			object.get = function(){
				alert(this.name +"," + this.password);
			}
			return object;
		}
		var object1 =  createObject();//             
		object1.get();
		*/
		/*        
		function createObject(username, password){
			var object = new Objcet();
			object.username = username;
			object.password = password;
			object.get = function(){
				alser(this.username +"," + this.password);
			}
		}*/
		/*                
		function get(username, password){
			alert(this.username +","+ this.password);
		}
		function createObject(username, password){
			var object = new Object();
			object.username = username;
			object.password = password;
			object.get = get
			return object;
		}
		var  obj = createObject("  ","1234");
		obj.get();*/
		
		/*
		4：   prototype (    )          
			prototype   object        
		  ：1:        prototype                       ，
				            。
			  2:   prototype                       
		function Person(){
		}
		Person.prototype.name = "zhangsan";
		Person.prototype.age = 13;
		Person.prototype.get = function (){
			alert(this.name +"," + this.age);
		}
		var  person = new Person();
		person.get();
		person.name = "lisi";
		person.get();*/
		/*
		5:        prototype   ，                        
		function Person(){
			this.name = "zhangsan";
			this.age = 12;
			if( typeof Person.flage == "undefined"){
				Person.prototype.getInf = function(){
					alert(this.name +"," + this.age);
				}
				this.flage = true;
			}
		}
		var p1 = new Person(); p1.getInf();
		var p2 = new Person(); p2.getInf();
		*/
		</script>

		<script type="text/javascript">
			/*1:             
			function Parent(username){
				this.username = username;
				this.sayname = function (){
					alert(this.username);
				}
			}
			function Child(username, password){
				this.temp = Parent; //              this.temp 
				this.temp(username); //        ，           this     Child      Child        
				delete this.temp;    //        this   
				this.password = password;
				this.sayPass = function (){
					alert(this.password);
				}
			}
			var chirld = new Child("  ","123");
			chirld.sayname();
			chirld.sayPass();*/
			/*2:    call       call       function        ， call(param1, param2,...);     
				        call  this
			function Parent(username){
				this.username = username;
				this.sayname = function (){
					alert(this.username);
				}
			}
			function Child(username, password){
				Perent.call(this, username);
				this.password = password;
				this.sayPass(){
				}
			}
			*/
			/*3:    apply      
				 apply         call       apply  apply(Param1, new Array());
			function Parent(username){
				this.username = username;
				this.sayname = function (){
					alert(this.username);
				}
			}
			function Child(username, password){
				Parent.apply(this, [username]); // Parent.apply(this, new Array(username));
				this.password = password;
				this.sayPass(){
				}
			}
			*/