原生javascript跨浏览器常用事件处理

var eventUntil = {

            getEvent: function (event) {//获取事件

                return event ? event : window.event

            },

            addHandler: function (element, type, handler) {//事件监听

                if (element.addEventListener) {

                    element.addEventListener(type, handler, false);

                } else if (element.attachEvent) {

                    element.attachEvent("on" + type, handler);

                } else {

                    element["on" + type]

                }

            },

            removeHandler: function (event) {//移除事件监听

                if (element.removeEventListener) {

                    element.removeEventListener(type, handler, false);

                } else if (element.detachEvent) {

                    element.detachEvent("on" + type, handler)

                } else {

                    element["on" + type] = null

                }

            },

            stopPropagation: function (event) {//阻止冒泡

                if (event.stopPropagation) {

                    event.stopPropagation();

                } else {

                    event.cancelBubble = true;

                }

            },

            preventDefault: function (event) {//取消事件默认行为

                if (event.preventDefault) {

                    event.preventDefault();

                } else {

                    event.returnValue = false;

                }

            },

            getTarget: function (event) {//获取事件目标

                return event.target || event.srcElement

            },

            getWheelDelta: function (event) {//获取滚轮事件delta增量(opera9.5以下版本wheelDelta值相反)

                if (event.wheelDelta) {

                    return (client.engine.opera && client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta)

                } else {

                    return -event.detail * 40//firefox

                }

            }

        };