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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.二更求粉。BIM's information model can be used by managers to query, modify and call, synchronously update system information, and better maintain equipment and buildings. The operation and maintenance of buildings usually include monitoring, communication, ventilation, lighting, elevators and other systems. If the above equipment and pipelines fail, they may affect the normal operation of buildings and even cause safety accidents.In fact, WCF content has been read very early, and many predecessors in the blog park have written it very well. However, I think I still need to summarize it myself, because only in this way can knowledge be my own, and how well others write it, after you read it, it is actually someone else, so I encourage you to make a few points (for these points, it is also a reminder to yourself):In any case, IT is an attractive business!饥饿的青春 第五季　　Matt将对自己对Sylar所做的行为感到愧疚, 他想回到妻子和孩子的身边, 但一切都很艰难.