//服务service1
function service1(){

}
//函数action1
function action1(){
 //other things
 //then 启动service1
 service1();
}

function service1(){}
function service2(){}
function service3(){}

function action1(){
 //other things 
 service1();
 service2();
 service3();
}

var servicearray = [];

function service1(){}
function service2(){}
function service3(){}
//将所有service添加到servicearray中
servicearray.push(service1);
servicearray.push(service2);
servicearray.push(service3);
//del：用于删除一个指定的service
function del(arr, fn){
 for(var i = 0; i < arr.length; i++){
  if( arr[i] == fn ){
   arr.splice(i,1);
   break;
  }
 } 
}
//action1后，执行所有的service
function action1(){
 //other things 
 //遍历serviceaary，执行所有service函数。（servicearray在action1内）
 for(var i =0; i < servicearray.length; i++){
  servicearray[i]();
 }
}
//添加service4
function service4(){}
servicearray.push(service4);
//删除service2
del(servicearray, service2);

var servicearray = [];

function service1(){}
function service2(){}
function service3(){}

servicearray.push(service1);
servicearray.push(service2);
servicearray.push(service3);
function del(arr, fn){
 for(var i = 0; i < arr.length; i++){
  if( arr[i] == fn ){
   arr.splice(i,1);
   break;
  }
 } 
}
//添加一个service4
function service4(){}
servicearray.push(service4);
//删除一个service2
del(servicearray, service2);
//添加一个触发函数hanldeAction，分离action与service
function hanldeAction(actionName,serviceArr){
 if(typeof actionName === 'function'){
  actionName();
  for(var i =0; i < serviceArr.length; i++){
   serviceArr[i]();
  }
 }
}
//执行
handleAction(action1,servicearray); 

function service1(){}
function service2(){}
function service3(){}

var servicearray = [];
servicearray.push(service1);
servicearray.push(service2);
servicearray.push(service3);
function del(arr, fn){
 for(var i = 0; i < arr.length; i++){
  if( arr[i] == fn ){
   arr.splice(i,1);
   break;
  }
 } 
}
//添加一个service4
function service4(){}
servicearray.push(service4);
//删除一个service2
del(servicearray, service2);
/*
 actionObj用于存储所有action与service关联的对象。
 如：{
   action1:[service1,service2],
   action2:[...]
  }
*/
var actionObj = {};
/*
 修改代码，增加一个actionName与serviceArr关联事件。
 如，action1关联所有service，这样再结合下方的trigger事件就完美了
 Params:
   actionName --> actionObj的属性
   serviceArr --> 包含所有与actionName相关的service数组
*/
function addAction(actionName, serviceArr){
 if(typeof actionObj[actionName] === 'undefined' ){
  actionObj[actionName] = [];
 }
 if(typeof serviceArr === 'object'){
  actionObj[actionName].push(serviceArr);
 }
}
/*
 修改代码，增加一个触发actionName事件
 如，当我想触发action1中的所有service时，调用trigger(action1)就OK啦
*/
function trigger( actionName ){
 var act = actionObj[actionName];
 if(act instanceof Array){
  for(var i = 0, len = act.length; i < len; i++){
   for(var j =0, arrlen = act[i].length; j++){
    ((act[i])[j])();
   }
  }
 }
}

var actionObj = {};
//修改代码，增加一个actionName与service函数直接关联事件
function addAction(actionName, fn){
 if(typeof actionObj[actionName] === 'undefined' ){
  actionObj[actionName] = [];
 }
 if(typeof fn === 'function'){
  actionObj[actionName].push(fn);
 }
}
//修改代码，增加一个触发actionName事件
function trigger( actionName ){
 var actionarray = actionObj[actionName];
 if(actionarray instanceof Array){
  for(var i = 0, len = actionarray.length; i < len; i++){
   if(typeof actionarray[i] === 'function'){
    actionarray[i]();
   }
  }
 }
}
//修改代码，增加一个删除actionName中的service事件
function remove(actionName, fn){
 var actionarray = actionObj[actionName];
 if(typeof actionName === 'string' && actionarray instanceof Array){
  if(typeof fn === 'function'){
   //清除actionName中对应的fn方法
   for(var i=0, len = actionarray.length; i < len; i++){
    if(actionarray[i] === fn){
     actionObj[actionName].splice(i,1);
    }
   }
  }
 }
}

var EventTarget = function(){
 this.listener = {};
}
EventTarget.prototype = {
 constructor:EventTarget,
 addAction: function(actionName, fn){
  if(typeof actionName === 'string' && typeof fn === 'function'){
   //如果不存在actionName，就新建一个
   if(typeof this.listener[actionName] === 'undefined'){
    this.listener[actionName] = [fn];
   }
   //否则，直接往相应actinoName里面塞
   else{
    this.listener[actionName].push(fn);
   }
  }
 },
 trigger: function(actionName){
  var actionArray = this.listener[actionName];
  //触发一系列actionName里的函数
  if(actionArray instanceof Array){
   for(var i = 0, len = actionArray.length; i < len; i++){
    if(typeof actionArray[i] === 'function'){
     actionArray[i]();
    }
   } 
  }
  actionArray = null;
 },
 remove: function(actionName, fn){
  var actionArray = this.listener[actionName];
  if(typeof actionName === 'string' && actionArray instanceof Array){
   if(typeof fn === 'function'){
    //清除actionName中对应的fn方法
    for(var i=0, len = actionArray.length; i < len; i++){
     if(actionArray[i] === fn){
      this.listener[actionName].splice(i,1);
     }
    }
   }
  }
  actionArray = null;
 }
};