跨浏览器的事件对象

var EventUtil = { 
      addHandler: function(element, type, handler){
         //省略的代码
     }, 
    getEvent: function(event){
         return event ? event : window.event;
     }, 
 
    getTarget: function(event){
         return event.target || event.srcElement;
     }, 
     preventDefault: function(event){
         if (event.preventDefault){
             event.preventDefault();
         } else {
             event.returnValue = false;
         }
     }, 
      removeHandler: function(element, type, handler){
         //省略的代码
     }, 
    stopPropagation: function(event){ 
        if (event.stopPropagation){   
          event.stopPropagation();  
       } else {    
         event.cancelBubble = true; 
        }  
   } 
 
};