拷贝继承: 通用型的 有new或无new的时候都可以
类式继承: new构造函数
原型继承: 无new的对象
拷贝继承
function CreatePerson(name,sex){ //父类
this.name = name;
this.sex = sex;
}
CreatePerson.prototype.showName = function(){
alert( this.name );
};
var p1 = new CreatePerson('小明','男');
//p1.showName();
function CreateStar(name,sex,job){ //子类
CreatePerson.call(this,name,sex);
this.job = job;
}
//CreateStar.prototype = CreatePerson.prototype;
extend( CreateStar.prototype , CreatePerson.prototype );
CreateStar.prototype.showJob = function(){
};
var p2 = new CreateStar('黄晓明','男','演员');
p2.showName();
function extend(obj1,obj2){
for(var attr in obj2){
obj1[attr] = obj2[attr];
}
}
类式继承
function Aaa(){ //父类
this.name = [1,2,3];
}
Aaa.prototype.showName = function(){
alert( this.name );
};
function Bbb(){ //子类
Aaa.call(this);
}
var F = function(){};
F.prototype = Aaa.prototype;
Bbb.prototype = new F();
Bbb.prototype.constructor = Bbb; //修正指向问题
var b1 = new Bbb();
//b1.showName();
//alert( b1.name );
//alert( b1.constructor );
b1.name.push(4);
var b2 = new Bbb();
alert( b2.name );
原型继承
function Parent(){
this.lastName = 'James';
}
function Child(){
this.age = 12;
}
Child.prototype = new Parent();
var test = new Child();
alert(test.age);
alert(test.lastName);
