JS Roller Event compatible notation

/** * Simple Event Add method */define (function (Require, exports, module) {exports.addevent = (function (window, undefined) {            var _eventcompat = function (event) {var type = Event.type;  if (type = = ' Dommousescroll ' | | type = = ' MouseWheel ') {Event.delta = (Event.wheeldelta)? Event.wheeldelta            /:-(Event.detail | | 0)/3;            }//alert (Event.delta);                if (event.srcelement &&!event.target) {event.target = event.srcelement;  } if (!event.preventdefault && event.returnvalue!== undefined) {Event.preventdefault =                function () {event.returnvalue = false;            }; }            /*                ......        Some other compatibility processing */return event;        }; if (window.addeventlistener) {return function (el, type, FN, capture) {if (type = = =) MouseWheel "&& Document.mozfullscreen!== undefined) {type = "dommousescroll";                } el.addeventlistener (Type, function (event) {Fn.call (this, _eventcompat (event)); }, Capture | |            FALSE); }} else if (window.attachevent) {return function (el, type, FN, capture) {El.attacheven                    T ("on" + Type, function (event) {event = Event | | | window.event;                    Fn.call (EL, _eventcompat (event));            });        }} return function () {};        }) (window); });

So, we can use mousewheel the event very calmly. For example:

Addevent (DOM, "MouseWheel", function (event) {    if (Event.delta < 0) {alert ("Mouse rolled up!") "); }});

　　

JS Roller Event compatible notation