通用的事件侦听器函数

// event(事件)工具集，来源：github.com/markyun
 markyun.Event = {
     // 页面加载完成后
     readyEvent : function(fn) {
         if (fn==null) {
             fn=document;
         }
         var oldonload = window.onload;
         if (typeof window.onload != 'function') {
             window.onload = fn;
         } else {
             window.onload = function() {
                 oldonload();
                 fn();
             };
         }
     },
     // 视能力分别使用dom0||dom2||IE方式 来绑定事件
     // 参数： 操作的元素,事件名称 ,事件处理程序
     addEvent : function(element, type, handler) {
         if (element.addEventListener) {
             //事件类型、需要执行的函数、是否捕捉
             element.addEventListener(type, handler, false);
         } else if (element.attachEvent) {
             element.attachEvent('on' + type, function() {
                 handler.call(element);
             });
         } else {
             element['on' + type] = handler;
         }
     },
     // 移除事件
     removeEvent : function(element, type, handler) {
         if (element.removeEnentListener) {
             element.removeEnentListener(type, handler, false);
         } else if (element.datachEvent) {
             element.detachEvent('on' + type, handler);
         } else {
             element['on' + type] = null;
         }
     }, 
     // 阻止事件 (主要是事件冒泡，因为IE不支持事件捕获)
     stopPropagation : function(ev) {
         if (ev.stopPropagation) {
             ev.stopPropagation();
         } else {
             ev.cancelBubble = true;
         }
     },
     // 取消事件的默认行为
     preventDefault : function(event) {
         if (event.preventDefault) {
             event.preventDefault();
         } else {
             event.returnValue = false;
         }
     },
     // 获取事件目标
     getTarget : function(event) {
         return event.target || event.srcElement;
     },
     // 获取event对象的引用，取到事件的所有信息，确保随时能使用event；
     getEvent : function(e) {
         var ev = e || window.event;
         if (!ev) {
             var c = this.getEvent.caller;
             while (c) {
                 ev = c.arguments[0];
                 if (ev && Event == ev.constructor) {
                     break;
                 }
                 c = c.caller;
             }
         }
         return ev;
     }
 }; 