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继承

admin 11月 14, 2020 0

构造函数形式的继承

function Animal(){
    this.eat=function(){
        console.log('animal eat')
    }
}
function Dog(){
    this.bark=function(){
        console.log('Dog bark')
    }
}
Dog.prototype=new Animal()
var dog1=new Dog()
dog1.eat()

class继承

class Animal{
    constructor(name){
        this.name=name
    }
    eat(){
        console.log(this.name+'eat')
    }
}
class Dog extends Animal(){
    constructor(name,age){
        super(name)//继承父类
        this.age=age
    }
    say(){
        console.log(this.name+'say')
    }
}
const dog=new Dog('哈士奇')
dog.say()

拷贝继承

//高程6.3继承