<script type="text/javascript">

(function (window,undefined){

    function _$(arguments)

    {

    }

    _$.prototype={

        constructor:_$,

        addEvent:function(){

                alert("addEvent");

                return this;

        },

        getStyle:function(){

                alert('getStyle');

                return this;

        }

    }

    window.$=_$;

    _$.onReady=function(fn){

        window.$=function(){

            return new _$(arguments);

        }

        fn();

    }

})(window)

$.onReady(function(){

    $("inq").addEvent().getStyle();

})

</script>

<script type="text/javascript">

(function (window,undefined){

    function _$(arguments)

    {

    }

    Function.prototype.method=function(methodName,fn)

    {

            this.prototype[methodName]=fn;

            return this;

    }

    _$.prototype={

        constructor:_$,

        addEvent:function(){

                alert("addEvent");

                return this;

        },

        getStyle:function(){

                alert('getStyle');

                return this;

        }

    }

    window.$=_$;

    _$.onReady=function(fn){

        window.$=function(){

            return new _$(arguments);

        }

        _$.method('addEvent',function(){

            alert("addEvent2");

                return this;

        }).method('getStyle',function(){

        alert("getStyle2");

                return this;

        });

fn();

    }

})(window)

$.onReady(function(){

    $("inq").addEvent().getStyle();

})

 //为什么要加_$.method()? 不加也行？

</script>