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Disk startup!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.3448女孩们又回到了第二个系列节目中，在北爱不稳定的和平进程的背景下，用他们所有的老把戏来引导父母、派对、爱情兴趣和学校。21. The performance appraisal is not clear. A clear reward or punishment system should be established. The performance appraisal has been implemented since May, but the performance salary has not been implemented, causing speculation and dissatisfaction among employees.在芝加哥的一所精英芭蕾舞学校，一个明星学生遭到蓄意伤害，她的替代者则走入一个充满谎言、背叛和残酷竞争的世界 。