es5继承

继承

ES5的继承也都是通过借用父类的构造方法来实现父类方法/属性的继承：

// 父类

functionsupFather(name){

this.name=name;

this.colors=['red','blue','green'];// 复杂类型

}

supFather.prototype.sayName=function(age){

console.log(this.name,'age');

};

// 子类

functionsub(name,age){

// 借用父类的方法：修改它的this指向,赋值父类的构造函数里面方法、属性到子类上

supFather.call(this,name);

this.age=age;

}

// 重写子类的prototype，修正constructor指向

sonFn.prototype=Object.create(fatherFn.prototype);// 继承父类的属性以及方法

sonFn.prototype.constructor=sonFn;// 修正constructor指向到继承的那个函数上

sub.prototype.sayAge=function(){

console.log(this.age,'foo');

};

// 实例化子类，可以在实例上找到属性、方法

constinstance1=newsub("OBKoro1",24);

constinstance2=newsub("小明",18);

instance1.colors.push('black')

console.log(instance1)// {"name":"OBKoro1","colors":["red","blue","green","black"],"age":24}

console.log(instance2)// {"name":"小明","colors":["red","blue","green"],"age":18}