关于取消冒泡的问题~请教大家了

JScript code

<script type="text/javascript">
    var oDiv=document.getElementById('div1');
    
    function addEvent(obj, ev, fn){
        if(obj.attachEvent){
            obj.attachEvent('on'+ev, fn);
        }else{
            obj.addEventListener(ev, fn, false);
        }
    }
    
    function cancelBub(ev){
        var ev=ev||window.event;
        if(ev.cancelBubble){
            ev.cancelBubble=true;
        }else{
            ev.stopPropagation();
        }
    }
    
    function aa(){
        alert('aa');
    }
    
    function bb(){
        alert('bb');
    }
    
    function cc(){
        alert('cc');
    };
    
    addEvent(document, 'click',aa)
    addEvent(document, 'click',bb)
    addEvent(oDiv, 'click',cc)
</script>

cancelBub是取消冒泡的函数，那我如何只取消addEvent(oDiv, 'click',cc)这个的冒泡呢？请教了~~

------解决方案--------------------
<script type="text/javascript">
var oDiv=document.getElementById('div1');
function addEvent(obj, ev, fn){
if(obj.attachEvent){
obj.attachEvent('on'+ev, fn);
}else{
obj.addEventListener(ev, fn, false);
}
}
function cancelBub(ev){
var ev=ev||window.event;
if(!ev.cancelBubble){
ev.cancelBubble=true;
}else{
ev.stopPropagation();
}
}

function aa(){
alert('aa');
}

function bb(){
alert('bb');
}

function cc(){
cancelBub();
alert('cc');
}

addEvent(document, 'click',aa);
addEvent(document, 'click',bb);
addEvent(oDiv, 'click',cc);
</script>
------解决方案--------------------
我改了两处，一处cancelBub函数
if(!ev.cancelBubble)
另一处function cc()里加上cancelBub();


------解决方案--------------------
如果ev.cancelBubble为假才需要把它设为true啊
------解决方案--------------------
因为cancelBubble默认是false