//?跨瀏覽器兼容的事件處理程序（能力檢測）
//?兼容性處理封裝在eventshiv對象的眾多方法中
//?如：eventshiv.addHandler(btn,?'click',?f1);

var?eventshiv?=?{
????//?event兼容
????getEvent?:?function?(event)?{
????????return?event??event?:?window.event;
????},

????//?type兼容
????getType?:?function?(event)?{
????????return?event.type;
????},

????//?target兼容
????getTarget?:?function?(event)?{
????????return?event.target??event.target?:?event.srcElement;
????},

????//?添加事件句柄
????addHandler?:?function?(element,type,listener)?{
????????if?(element.addEventListener)?{
????????????//?2級?DOM
????????????element.addEventListener(type,?listener,?false);
????????}?else?if?(element.attachEvent)?{
????????????//?IE
????????????element.attachEvent('on'?+?type,?listener);
????????}?else?{
????????????//?0級?DOM
????????????//?element.onclick?===?element['onclick']
????????????//?在這里由于.與'on'字符串不能鏈接，只能用后者
????????????element['on'?+?type]?=?listener;
????????}
????},

????//?移除事件句柄
????removeHandler?:?function?(element,type,listener)?{
????????if?(element.removeEventListener)?{
????????????//?2級?DOM
????????????element.removeEventListener(type,?listener,?false);
????????}?else?if?(element.detachEvent)?{
????????????//?IE
????????????element.detachEvent('on'?+?type,?listener);
????????}?else?{
????????????//?0級?DOM
????????????//?element.onclick?===?element['onclick']
????????????//?在這里由于.與'on'字符串不能鏈接，只能用后者
????????????element['on'?+?type]?=?null;
????????}
????},

????//?取消默認行為
????preventDefault?:?function?(event)?{
????????if?(event.preventDefault)?{
????????????//?非IE
????????????event.preventDefault();
????????}?else?{
????????????//?IE
????????????event.returnValue?=?false;
????????}
????},

????//?阻止事件冒泡
????stopPropagation?:?function?(event)?{
????????if?(event.stopPropagation)?{
????????????//?非IE
????????????event.stopPropagation();
????????}?else?{
????????????//?IE
????????????event.cancelBubble?=?true;
????????}
????}
}

console.log('eventshiv.js?文件加載成功！');