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Interview.prototype.writtenTest = function () {222. X.X.106Next, we will talk about the responsibility chain mode. There are multiple objects, each of which holds a reference to the next object, thus forming a chain on which requests are passed until an object decides to process the request. However, the sender does not know which object will process the request in the end, so the responsibility chain mode can be implemented to dynamically adjust the system without concealing the client. Let's look at the diagram first:　　1927年4月12日，蒋介石发动了震惊中外的“四·一二”反革命政变。在反革命“清党”的腥风血雨中，板凳的大师兄常墩子身为一个共产党员，在执行任务的过程中惨遭敌人的杀害。临终前，常墩子将一个流浪儿红儿托付给板凳，板凳便由此踏上了“九死一生”的险途。再说，这时候，谁家不是这样，又不是咱们一家。State mode and policy mode are like twins. They both encapsulate a series of algorithms or behaviors. Their class diagrams look almost identical, but their intentions are very different, so they are two very different modes. The policy pattern and the state pattern have in common that they both have a context, policies or state classes to which the context delegates the request to execute