var EventUtil = { 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; } }, removeHandler: function (element, type, handler) { if (element.removeEventListener) { element.removeEventListener(type, handler, false); } else if (element.detachEvent) { element.detachEvent("on" + type, handler); } else { element["on" + type] = null; } }, getEvent: function (event) { return event ? event : window.event; }, getTarget: function (event) { return event.target || event.srcElement; }, preventDefault: function (event) { if (event.preventDefault) { event.preventDefault(); } else { event.returnValue = false; } }, stopPropagation: function (event) { if (event.stopPropagation) { event.stopPropagation(); } else { event.cancelBubble = true; } }, getRelatedTarget: function (event) { if (event.relatedTarget) { return event.relatedTarget; } else if (event.toElement) { return event.toElement; } else if (event.fromElement) { return event.fromElement; } else { return null; } }, // 检测鼠标按下的是左-0/中-1/右-2键 getButton: function (event) { if (document.implementation.hasFeature("MouseEvents", "2.0")) { return event.button; } else { switch (event.button) { case 0: case 1: case 3: case 5: case 7: return 0; case 2: case 6: return 2; case 4: return 1; } } }, // 获取按键code,或使用event.key || event.keyIdentifier获取键值 getCharCode: function (event) { if (typeof event.charCode == "number") { return event.charCode; } else { return event.keyCode; } }, };
原文:https://www.cnblogs.com/hanxiaoer/p/11573862.html