SOURCE

class EventEmitter {
    constructor(){

    }

    on() {

    }

    off() {

    }

    emit() {

    }
}

let man1 = {
    name: 'xixi',
    age: 22
}
let man2 = {
    name: 'haha',
    age: 25
}

// 测试
let eventBus = new EventEmitter()
let fn1 = function(name, age) {
	console.log(`${name} ${age}`)
}
let fn2 = function(name, age) {
	console.log(`hello, ${name} ${age}`)
}
eventBus.on('aaa', fn1)
eventBus.on('aaa', fn2)
eventBus.emit('aaa', false, '布兰', 12)
// '布兰 12'
// 'hello, 布兰 12'