Another scenario that is specifically for Preview events is to mark them handled so that the matching bubbling class handlers are not invoked.
还有一种方案专门用于预览事件，即将这些事件标记为已处理，从而避免调用匹配的冒泡类处理程序。
3
On the base of the studies of traditional In-depth packet filter algorithms, a new algorithm of Pattern matching based on the pre-processed mark is put forward and realized.