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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.[Traffic]本剧讲述的是19世纪末叶在位于柏林最大的历史最悠久的医院“夏绿特”里一些著名医师和科学家的丰功伟绩。　此剧讲述继承了巨额债务、为了挽回父亲的名义而努力偿还债务的富家公子，和在他身边积极支持他的坚强女人之间的故事。In this section, we will learn about the event module. Event module is mainly used to detect some event operations from other modules. It is generally used as the basis for starting programs and is also a relatively simple module. There are also fewer building blocks. We will introduce them one by one through the following diagrams:在妻子小学教师林小枫眼里，丈夫肝胆外科医生宋建平是一个平凡的好人。“好人”固然好，平凡就不太好了。就是因为宋建平的平凡，她和儿子当当只能过着普通人的生活，被排除在现代大都市的生活之外。