//判断浏览器类型
var client = function () {
var engine = {
ie: 0,
gecko: 0,
webkit: 0,
khtml: 0,
opera: 0,
ver: null
};
return {
engine: engine
};
}();
var EventUtil = {
getEvent: function (event) {
return event ? event : window.event;
},
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;
}
},
getWheelDelta: function (event) {
var driect = null;
if (event.wheelDelta) {
driect = (client.engine.opera && client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta);
} else {
driect = -event.detail * 40;
}
return (driect > 0 ? 1 : -1);
}
};
//调用方法getWheelDelta()
(function () {
function handleMouseWheel(event) {
event = EventUtil.getEvent(event);
var delta = EventUtil.getWheelDelta(event); alert(delta);
}
EventUtil.addHandler(document, "mousewheel", handleMouseWheel);
EventUtil.addHandler(document, "DOMMouseScroll", handleMouseWheel);
})()
//输出：向上滚动鼠标滚轮时弹出‘1’，向下滚动鼠标滚轮时弹出‘-1’
