JS的事件对象(Event)

代码

function getEvent(event) {
var ev = event || window.event;
if (!ev) {
var c = this.getEvent.caller;
while (c) {
ev = c.arguments[0];
if (ev && (Event == ev.constructor || MouseEvent == ev.constructor)) { /怿飞注：YUI 源码 BUG，ev.constructor 也可能是 MouseEvent，不一定是 Event
break;
}
c = c.caller;
}
}
return ev;
}

调用执行的是：

function foo(){
var e = getEvent();
alert(e);
}

复习下事件,长年用JQ,都给忘了~