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The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:吕嬃当即笑道：说起来也巧，还记得嘛，当年从单父县逃难去彭城的时候。板栗见皇帝沉吟不决，奇怪地唤道：皇上？皇上可是有难碍之处？若有，不妨吩咐臣，臣过完年就赶紧回来。C) You have a comprehensive understanding of the basic principles and concepts, and you can regret: "I have found a model that has long existed in the [design model] (actually the model mentioned in a special book or article)". At this time, what if the mode is not the mode? What about anti-patterns? When you see a pattern, you will say, "Well, this is a useful pattern." Seeing mountains is only mountains, seeing water is only water.如果这时，再去阅读《神雕侠侣》，那是一种怎么样的感受？击杀蒙古皇帝蒙哥的大侠杨过变成一个偏激少年，已故的峨眉派开派祖师郭襄变成一个活泼开朗的小丫头片子，一代宗师张三丰变成了一个懵懂单纯的小和尚……大家是否会有一种时空错乱的感觉？这也就是陈启先写《倚天》的原因。Traceability checkOn February 10, Sina Weibo account @ Feng's World Iraq did not know how to make a statement as "Shanghai woman's boyfriend" and hoped that netizens would not criticize "Shanghai woman".