Js继承

一、对象冒充

1.

function ClassA(name){

   this.name = name;

}

ClassA.prototype.getName = function(){

   return this.name;

}

function ClassB(name){

    this.method1 = ClassA;

    this.method1(name);

    delete ClassB.prototype.method1;

}

2.call

function ClassA(name){

   this.name = name;

}

ClassA.prototype.getName = function(){

   return this.name;

}

function ClassB(name){

   ClassA.call(this,name);

}

可支持多继承

3.apply

function ClassA(name){

   this.name = name;

}

ClassA.prototype.getName = function(){

   return this.name;

}

function ClassB(name){

   ClassA.apply(this,new Array(name));

}

二、原型链

 

function ClassA(){

}

ClassA.prototype.name = "张三";

ClassA.prototype.getName = function(){

   return this.name;

}

ClassB.prototype = new ClassA();

ClassB.prototype.name = "王五";

不支持多继承

三、对象冒充+原型链

function ClassA(name){

   this.name = name;

}

ClassA.prototype.getName = function(){

    return this.name;

}

function ClassB(name){

   ClassB.call(this,name);

}

ClassB.prototype = new ClassA();

ClassB.prototype.age = "10";