观察者模式1

by 苹果熊

JavaScript

var publisher = {
	subscribers: {
  	any: []
  },
  subscribe: function(fn, type) {
  	type = type || 'any'
    if(!this.subscribers[type]) {
    	this.subscribers[type] = []
    }
    this.subscribers[type].push(fn)
  },
  unsubscribe: function(fn, type) {
  	type = type || 'any'
    var subs = this.subscribers[type]
    for(var i = 0; i < subs.length; i++) {
    	 subs.splice(i, 1)
    }
  },
  publish: function(cont, type) {
  	type = type || 'any'
    var subs = this.subscribers[type]
    for(var i = 0; i < subs.length; i++) {
    	subs[i](cont)
    }
  }
}
function makePublisher(o) {
	for(var i in publisher) {
  	if(publisher.hasOwnProperty(i) && typeof publisher[i] === 'function') {
    	o[i] = publisher[i]
    }
  }
  o.subscribers = {
  	any: []
  }
}

//do something
var teacher = {
	task: function(tasks) {
  	this.publish(tasks)
  }
}
makePublisher(teacher)
var student = {
	homeWork: function(tasks) {
  	console.log(tasks)
  }
}
teacher.subscribe(student.homeWork)

teacher.task('完成100篇论语抄写！')
teacher.task('完成100篇将进酒抄写！')