js设计模式至观察者模式--不同模块间解耦

var Observer = (function(){
var _messages = {};
return {
regist:function(type,fn){
if(typeof _messages[type] ==='undefined'){
_messages[type] = [fn];
}else{
_messages[type].push(fn);
}
},
fire:function(type,args){
if(!_messages[type])
return;
var events={
type:type,
args:args || {}
},i = 0,len =  _messages[type].length;
for(; i < len ; i ++){
_messages[type][i].call(type,events);
}
},
remove:function(type,fn){
if(_messages[type] instanceof Array){
var i = _messages[type].length - 1;
for(; i >= 0 ; i -- ){
_messages[type][i] === fn && _messages[type].splice(i,1);
}
}
}
}
})();


Observer.regist('test',function(e){
console.log(e.type,e.args.msg);
});
Observer.fire('test',{msg:'console args '});