function?stopPropagation(event){ if(event?&&?event.stopPropagation){stopPropagation?=?function(event){event.stopPropagation();};?stopPropagation(event);?return;} if(window.event?&&?event.stopPropagation){stopPropagation?=?function(event){window.event.stopPropagation();};stopPropagation(event);?return;} if(event){stopPropagation?=?function(event){event.cancelBubble?=?true;};?stopPropagation(event);?return;} if(window.event){stopPropagation?=?function(event){window.event.cancelBubble?=?true;};stopPropagation(event);?return;} } event.cancelBubble如果最終是在ie7的瀏覽器調用了這個方法，那么默認event.cancelBubble的值是flase還是true？ 本來后面兩個判斷我是想加上event.cancelBubble if(event?&&?event.cancelBubble) if(window.event?&&?window.event.cancelBubble)?? 但是看以前寫的冒泡排序上有個?event.cancelBubble?=?true;??所以想問下??這個默認是不是false ieTest上試過???但是不知道為啥我的那個上面明明寫了alert?但是不管怎么樣就不是彈出來