SOURCE

//工厂模式
class Ldh {
    constructor(name,age){
        this.name = name;
        this.age = age;
    }
    song(){
        console.log(this.name)
    }
}

class Creator {
    create(name){
        return new Ldh(name)
    }
}

let creator = new Creator();
let p = creator.create('11')
p.song()

//观察者模式
//订阅者
class Subject {
    constructor(){
        this.state = 0;
        this.observers = []
    }
    getState(){
        return this.state
    }
    setState(state){
        this.state = state;
        this.notifyAllObservers()
    }
    notifyAllObservers(){
        this.observers.forEach(observer => {
            observer.update()
        })
    }
    attach(observer){
        this.observers.push(observer)
    }
}

//观察者
class Observer {
    constructor(name,subject){
        this.name = name
        this.subject = subject
        this.subject.attach(this)
    }
    update(){
        console.log(this.name,111)
    }
}

var s = new Subject()
var o = new Observer('name11', s)
s.setState(1)