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Javascript neither supports abstract classes nor has the concept of interfaces. Therefore, be very careful when using the state mode. If you forget to implement the buttonWasPressed method for a state subclass when writing a state subclass, an exception will be thrown when the state switches. Because Context always delegates requests to the buttonWasPressed method of the state object. Therefore, let the abstract method of the abstract parent class throw an exception directly, which will be found at least during the program run.故事发生在一九三七年秋天上海。上海滩的著名电影演员李梦露突然在包住的百老汇大饭店坠楼而亡，引起轩然大波。各界议论纷纷，官方结论是自杀。Not only does it mean that after the content production is completed, the operation measures are over. These contents should be better distributed inside and outside the product, so as to make full use of the content and maximize the value of the content.When the incident occurs, the incident will begin to spread. Why should it be spread? Because the event source itself does not have the ability to handle the event. For example, when we click one, a click event will be generated, but the button itself cannot handle the event (nonsense). The event must be propagated from the button to reach the code that can handle the event (for example, we give the onclick attribute of the button the name of a function, that is, let the function handle the click event of the button).　　时杜结识二女鬼，紫云，紫花，对紫花尤其迷恋，二人展开旖旎烂漫的爱情，惜此事被花之主人三魔查悉，遂向花四家压力，花终于在无可选择的情况下，自我了断以结束此段哀怨的感情，此事更间接令钟与三摩展开连番恶斗。风雨交加，嘉靖犯关节炎头疼腰酸的一个该死的下午，徐阶将全新会审结果与胡宗宪的一纸密信送到了嘉靖的书房中。