阻止事件冒泡（stopPropagation和cancelBubble）和阻止預設行為(preventDefault和returnValue)

<div id="divId1" style="width:500px;height:500px;background-color:#3ac;text-align:center;" align="center">
            <div id="divId2"  style="width:400px;height:400px;background-color:#f1f; margin:0 auto;">開始啦</div>
        </div>

        document.getElementById('divId1').onclick = function(){
            alert('divId1');
        }
var eleDiv2 = document.getElementById('divId2');
        if(eleDiv2.addEventListener){
            eleDiv2.addEventListener('click',function(evt){
                alert('divId2');
                evt.stopPropagation();
            },false);
        }else{
            eleDiv2.attachEvent('onclick',function(evt){
                alert('divId2');
                evt.cancelBubble = true;
            });
        }

 

    //阻止冒泡事件  
     function stopBubble(e) {  
         if (e && e.stopPropagation) {//非IE  
             e.stopPropagation();  
         }  
         else {//IE  
             window.event.cancelBubble = true;  
         }  
     }  



function stopDefault(e) {  
     //阻止預設瀏覽器動作(W3C)  
     if (e && e.preventDefault)  
         e.preventDefault();  
     //IE中阻止函式器預設動作的方式  
     else  
         window.event.returnValue = false;  
     return false;  
 }