SOURCE

function Event(){
    this.demo = []
    this.results = []
}

//订阅
Event.prototype.on = function(callback){
    this.demo.push(callback)
}

//发布
Event.prototype.emit = function(data){
    this.results.push(data)
    this.demo.forEach(fn => {
        console.log(data,this.results,8888)
        fn(this.results)
    })
}

var e = new Event()
e.on(function(data){
    console.log(data,111)
})

e.on(function(data){
    console.log(data,22)
})

e.emit(22)
e.emit(333)