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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.Next, try another method, that is, use the following delegate function to complete the writing of this state machine. This is an example of object-oriented design. The former saves variables as attributes of objects, while the latter encloses variables in the environment formed by closures:……唉。The term "fire-fighting technical service institutions" as mentioned in these Provisions refers to social organizations engaged in fire-fighting technical service activities such as maintenance and testing of fire-fighting facilities and fire-fighting safety assessment.季木霖被他拽的有些不耐烦了，于是妥协地走到衣架旁拿外套，徐风也跟着在旁边换，头上戴了飞机帽遮住了耳朵上的纱布，脖子上还围了厚实的围巾，穿戴整齐后就露了半张脸，看起来就暖和。在华盛顿特区肯尼迪中心举行的众星云集的颁奖典礼上，大卫查普尔被授予著名的马克.吐温美国幽默奖。对于发生着变化的自己，银也非常苦恼。想和黑在一起，但是这样下去的话……以银为目标的狙击者出现，新的斗争也被点燃。命运的选择再次降临到黑的头上。几乎把两人之间的羁绊撕裂的悲剧的序幕，正悄无声息的开始上演……