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//Since the single pattern is instantiated only once, the following instances are equalIn the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:我就看看他俩还能折腾多久，才去干点该干的事。午夜2点，玫瑰园小区附近突然响起枪声，市外贸局长裘成贵倒在血泊里，市刑警支队副支队长朱光奉命接手此案，公安局长南平却收回命令，要朱光把案子交给副支队长史金浩负责……Printing the screenshot above, we can see that the subscriber receives every message from the publisher. However, for Xiao Hong, she only wants to receive messages with red color and does not want to receive messages with black color. Therefore, we need to make the following modifications to the code. We can first add a key so that the subscriber can only subscribe to messages of interest to herself. The code is as follows:In addition, the structure of the mind map is divergent, which is very beneficial to the divergent thinking and creative thinking of the brain, and it is also easy to add new content. However, if new content is added in the middle of the two lines of text notes, the traditional linear notes will become dense, and even the lines will be introduced everywhere, which is neither good-looking nor conducive to summary.