javascript 계승의 6가지 방법

2737 단어
1. 원형 체인 계승
function father() {  
            this.faName = 'father';  
        }  
        father.prototype.getfaName = function() {  
            console.log(this.faName);  
        };  
        function child() {  
            this.chName = 'child';  
        }  
        child.prototype = new father();  
        child.prototype.constructor = child;  
        child.prototype.getchName = function() {  
            console.log(this.chName);  
        };  
father();

2. 구조 함수를 빌려 계승
function father(name) {  
            this.faName = 'father';  
        }  
        father.prototype.getfaName = function() {  
            console.log(this.faName);  
        };  
        function child(args) {  
            this.chName = 'child';  
            father.apply(this,[]); //   
        }  
        child.prototype = new father(); //   
        child.prototype.constructor = child;  
        child.prototype.getchName = function() {  
            console.log(this.chName);  
        };  
father();
alert(faName);

3. 조합 상속(원형+차용 구조)
function SuperType(name){
 this.name=name;
 this.colors=["red","blue","green"];
}
SuperType.prototype.sayName=function(){
 console.log(this.name);
}
function SubType(name,age){
 SuperType.call(this,name);
 this.age=age;
}
SubType.prototype=new SuperType();
SubType.prototype.constructor=SubType;
SubType.prototype.sayAge=function(){
 console.log(this.age);
}
var instance1=new SubType("zxf",24);
instance1.colors.push("black");
console.log(instance1.colors);
instance1.sayName();
instance1.sayAge();
var instance2=new SubType("jay",36);
console.log(instance2.colors);
instance2.sayName();
instance2.sayAge();

4. 원형 계승
function Show(){
this.name="run";
}

function Run(){
this.age="20";
}
Run.prototype=new Show();
var show=new Run();
alert(show.name)

5. 기생식 계승
function createAnother(original){
 var clone = Object.create(original);
 clone.sayHi = function(){
  alert("Hi");
 };
  
 return clone;
}
 
var person = {
 name: "Bob",
 friends: ["Shelby", "Court", "Van"]
};
var anotherPerson = createAnother(person);
anotherPerson.sayHi();

6. 기생 조합식 계승
function SuperType(name){
 this.name = name;
 this.colors = ["red", "blue", "green"];
}
SuperType.prototype.sayName = function(){
 alert(this.name);
}
 
function SubType(name, age){
 SuperType.call(this, name);
  
 this.age = age;
}
SubType.prototype = new SuperType();
SubType.prototype.sayAge = function(){
 alert(this.age);
}

좋은 웹페이지 즐겨찾기