js 跨浏览器获取事件信息模块

 var EventUtil = {
     addHandler: function(element, type, handler) {
         if (element.addEventListener) {
             element.addEventListener(type, handler, false);
         } else if (element.attachEvent) {
             element.attachEvent('on' + type, handler);
         } else {
             element['on' + type] = handler;
         }
     },
     removeHandler: function(element, type, handler) {
         if (element.removeEventListener) {
             element.removeEventListener(type, handler, false);
         } else if (element.detachEvent) {
             element.detachEvent('on' + type, handler);
         } else {
             element['on' + type] = null;
         }
     },
     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;
         }
     },
     stopPropagation: function(event) {
         if (event.stopPropagation) {
             event.stopPropagation();
         } else {
             event.cancelBubble = true;
         }
     }
 };