javascript中实现继承的几种方式
1、借用构造函数实现继承
function Parent1(){
this.name = "parent1"
}
function Child1(){
Parent1.call(this);
this.type = "child1";
}
缺点：Child1无法继承Parent1的原型对象，并没有真正的实现继承（部分继承）
2、借用原型链实现继承
function Parent2(){
this.name = "parent2";
this.play = [1,2,3];
}
function Child2(){
this.type = "child2";
}
Child2.prototype = new Parent2();
缺点：原型对象的属性是共享的
3、组合式继承
function Parent3(){
this.name = "parent3";
this.play = [1,2,3];
}
function Child3(){
Parent3.call(this);
this.type = "child3";
}
Child3.prototype = Object.create(Parent3.prototype);
Child3.prototype.constructor = Child3