emitter 增强 多条件触发

 ;(function(global ,undefined){
     var evts = {}
         ,onceTag = '__event_once'
     function emit(event ){
         var args = util.toArray(arguments , )
         if (!(event in evts)) return
         var _dels = []
         for (var i =  , j = evts[event].length ; i < j ;i ++){
             var cbk = evts[event][i]
             if (!cbk) return
             cbk.apply(null , args)
             if (cbk[onceTag])  { evts[event][i] = null ; _dels.push[i]}
         }
         for (var i = _dels.length - ; i>= ; i--) evts[event].splice(_dels[i] , )
     }

     function addMultiCon(event , listener){
         var once = true
         event.sort()
         addListener(event.join('|') , listener , once)
         var eventBubbles = []
         function tinOpener(evt){
             eventBubbles.push(evt)
             if (eventBubbles.length >=  event.length) {
                 eventBubbles.sort()
                 emit(eventBubbles.join('|'))
             }
         }

         for (var i =  ; i < event.length;i ++){
             addListener(event[i] , tinOpener.bind(null, event[i]) , once)
         }
     }

     function addListener(event , listener , once){
         if (util.isArray(event)) return addMultiCon(event , listener)

         if (!(event in evts)) evts[event] = []
         if (once) listener[onceTag] = true
         evts[event].push(listener)
     }

     function removeListener(event, listener){
         if (!listener) {
             delete evts[event]
             return
         }
         for (var i =  , j = evts[event].length ; i < j ;i ++){
             if (evts[event][i] === listener) {  evts[event].splice(i, ) ; break}
         }
     }

     function listeners(event){
         return evts[event]
     }
     global.emitter = {
         on : addListener
         ,once : function(event , listener){
                 addListener(event , listener , true)
                 }
         ,emit : emit
         ,listeners : listeners
     }
 })(this)

 function toArray(colletions ,offset){
    return Array.prototype.slice.call(colletions , offset || )
}

emitter.on(['test','test2'] , function(){
   console.log('test is fired')
})

emitter.emit('test')

emitter.emit('test2')