롤러 이벤트 방법 봉인

    
    
    


    

        
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        //     
        var box=document.getElementById('box');
        mouseWheel(box,function(event,down){
            //               
            var width=this.offsetWidth;
            var height=this.offsetHeight;

            //       
            if (down) {
                //         ,    ,          500
                if (width>=500&&height>=500) {
                    //     
                    width=500;
                    height=500;
                }else{
                    //            
                    this.style.width=width+1+"px";
                    this.style.height=height+1+"px";
                }
                //            
            }else{
                //         ,      
                if (width<=300&&height<=300) {
                    width=300;
                    height=300;
                }else{
                    //           
                    this.style.width=width-5+"px";
                    this.style.height=height-5+"px";
                }
            }

        });
    

/*
    @author     Henry Zhang
    @date       2016-008-02
    @version    01(  )
*/ 
function mouseWheel(obj,fn){
    //      ff   
    var ff=navigator.userAgent.indexOf("Firefox");
    //        
    if (ff!=-1) {
        //  box      
        obj.addEventListener('DOMMouseScroll',wheel,false);
    }else{
        obj.onmousewheel=wheel;
    }
    //          
    function wheel(event){
        var event=event||window.event;
        var down=true;
        if (event.detail) {
            down=event.detail>0;
        }else{
            down=event.wheelDelta<0;
        }
        console.log(down);
        fn.apply(obj,[event,down]);
        /*
              :fn              
                apply()     ,               fn  
        */ 

        return false;
    }

}