javascript继承

 

 绑定构造函数

---

 

在子类构造函数中使用Fatherconstructor.apply(this, arguments)

eg：

//父类

function People(name,age){

    this.name = name;

    this.age = age;

    this.species = "human";

    this.getName = function(){

        return this.name;

    }

    this.getAge = function(){

        return this.age;

    }

    this.sayHello = function(){

        console.log("hi,I am the father class");

    }

}



//子类

function Children(name,age){    

    People.apply(this,arguments)

}



var wish = new Children("wish");

console.log("the name of wish is:"+wish.getName());  //the name of wish is:wish 

console.log(wish.sayHello());  //hi,I am the father class 

 

 

使用prototype

---

 

 详细见：js-prototype

 

也使用prototype拷贝

准备拷贝函数：

function extend(Child, Parent){

    var parent = Parent.prototype;

    var child = Child.prototype;

    for(var i in parent){

        child[i] = parent[i];

    }

    child.uber = parent; //备用性质，指向上一层

}

 

eg：

//父类

function People(){

}

People.prototype.sayHello = function(){

    return "hello";

}

People.prototype.getName = function(){

    return this.name;

}

People.prototype.getAge = function(){

    return this.age;

}



//子类

function Children(name, age){

    this.name = name;

    this.age = age;

}



//定义拷贝函数



function extend(Child, Parent){

    var parent = Parent.prototype;

    var child = Child.prototype;

    for(var i in parent){

        child[i] = parent[i];

    }

    child.uber = parent; //备用性质，指向上一层

}



//子类



extend(Children, People);

var wish = new Children("wish","20");

console.log(wish.getName());  //wish

console.log(wish.getAge());  //20

console.log(wish.sayHello());  //hello

 

 拷贝继承

---

 

 

function deepCopy(p, c) {

　　　　var c = c || {};

　　　　for (var i in p) {

　　　　　　if (typeof p[i] === 'object') {

　　　　　　　　c[i] = (p[i].constructor === Array) ? [] : {};

　　　　　　　　deepCopy(p[i], c[i]);

　　　　　　} else {

　　　　　　　　　c[i] = p[i];

　　　　　　}

　　　　}

　　　　return c;

}

 

详细见： js对象拷贝

 

参考：http://www.ruanyifeng.com/blog