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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.This is a concrete example of countering input: a few years ago, a smart spammer realized that if the same multipart attachment appeared many times in an email, Gmail would only display the last attachment visible in the screenshot above. He weaponized this knowledge, adding the invisible first multipart, which contains many famous domains, in an attempt to evade detection. This attack is a variant of the attack class called keyword padding.11　二〇三高地So many concepts, don't have a headache! Let's look at the relationship between the three methods with pseudo code!　　文革的号角在不经意间吹响，历史的洪流彻底的改变了所有人的命运……慕容瑶被划成黑五类，于振亚被打成走资派。于红趁势做了造反派，成为工厂造反派小头目，而她暗恋的匡逸夫父亲被打成走资派，被关押在他们厂的“小黑屋”中。大串联、自杀、红卫兵、造反、走资派、右派、强奸……轰轰烈烈的年代里，爱情、亲情、友情已经全被被扭曲，或丑陋或纯真的人性表露无遗……FM Fuji music spice! (Thursday, 23: 00-0: 00 Beijing time, Friday, 0: 00-1: 00 Tokyo time)警察佐野文吾因杀人事件被逮捕并判处死刑，然而佐野坚称自己无辜。31年后，佐野的儿子田村心独自展开调查，来到曾经的案发现场时忽然被浓雾包围，回到了事件发生当年……