javascript 传统事件模型构造的事件监听器实现代码

代码如下：

var br={}; 
br.eventRouter = {}; 
br.eventRouter.addListen = function(el,eventType,func){ 
if(!el.eventObjs){ 
el.eventObjs = {}; 
} 
if(!el.eventObjs[eventType]){ 
el.eventObjs[eventType]=[]; 
br.eventRouter.bindListen(el,eventType); 
} 
el.eventObjs[eventType].push(func); 
}; 
br.eventRouter.removeListen = function(el,eventType,func){ 
if(el.eventObjs && el.eventObjs[eventType]){ 
for(var i=0,len=el.eventObjs[eventType].length;i<len;i++){ 
var item = el.eventObjs[eventType][i]; 
if(func==item){ 
el.eventObjs[eventType].splice(i,1); 
return true; 
} 
} 
} 
return false; 
}; 
br.eventRouter.bindListen = function(el,eventType){ 
if(el.eventObjs && el.eventObjs[eventType]){ 
el[eventType] = function(e){ 
for(var i=0,len=el.eventObjs[eventType].length;i<len;i++){ 
var f = el.eventObjs[eventType][i]; 
f.call(el,e); 
} 
}; 
} 
};

代码比较简单，不做过多解释。也希望有兴趣的同学给出bug。