源生js事件封装

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;
        }
    }




};