3、对特殊事件（如live）的处理
4、最后对elemData进行处理，如果events为空对象则删除elemData的events和handle属性。如
// Remove the expando if it’s no longer used
if ( jQuery.isEmptyObject( events ) ) {
var handle = elemData.handle;
if ( handle ) {
handle.elem = null;
}
delete elemData.events;
delete elemData.handle;
if ( jQuery.isEmptyObject( elemData ) ) {
jQuery.removeData( elem, undefined, true );
}
}
jQuery事件管理数据结构图：
