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All properties obtained here are set to null, and an alert will be given when the event object is accessed again.或者，你想家想的不行了，就回京来住一段日子。一个曾让无数人为之心动的难忘故事,一个可以称之为经典的人性传奇,曾经的《道北人》给了我们那么多对人生的思考,今天让我们再继续品味这段往事,再次回到我们曾经的峥嵘岁月.剧情讲述一对从小分开长大的亲生兄弟本来关系亲密，却因为喜欢上同一个女生而反目的故事！One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.熊康默默地看着义子，心情也颇为复杂，现如今只能看他自己如何选择了………熊心一屁股坐在地上，你的聪明只是小聪明，当不得大事，尹旭一番话责碎了他心中太多的自信。