关于ie和firefox下event的兼容解决办法

重写event事件

<script>

/*firefox*/

function __firefox(){

    HTMLElement.prototype.__defineGetter__("runtimeStyle", __element_style);

    window.constructor.prototype.__defineGetter__("event", __window_event);

    Event.prototype.__defineGetter__("srcElement", __event_srcElement);

}

function __element_style(){

    return this.style;

}

function __window_event(){

    return __window_event_constructor();

}

function __event_srcElement(){

    return this.target;

}

function __window_event_constructor(){

    if(document.all){

        return window.event;

    }

    var _caller = __window_event_constructor.caller;

    while(_caller!=null){

        var _argument = _caller.arguments[0];

        if(_argument){

            var _temp = _argument.constructor;

            if(_temp.toString().indexOf("Event")!=-1){

                return _argument;

            }

        }

        _caller = _caller.caller;

    }

    return null;

}

if(window.addEventListener){

    __firefox();

}

/*end firefox*/

</script>