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Today, the editor will share with you the relevant knowledge points of web behavior pattern, which are detailed and logically clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Different information transmission paths

When communication is needed between multiple nodes, if the communication channel is established between the nodes, the geometric series of the communication channel will be increased. At this time, the Mediator design pattern is used to provide a central node for communication, which can effectively prevent the complexity of the communication channel. At this time, the communication topology can be regarded as a star structure. In this case, there is a coupling relationship between the central node and all communication objects.

Using the Observer design pattern provides an one-to-many communication channel. As long as the observer logs in in advance, a suitable communication channel can be established in an uncoupled way. At this time, the communication topology is a sector structure.

The chain of responsibility pattern is often attached to a known data structure, such as a tree mechanism. Information can be spread along a chain-like path in accordance with pre-agreed principles. The node on the propagation path can choose to process the message or continue to propagate the message.

Command or policy?

Whether it is structure diagram or code, command and policy patterns are very similar. The meaning of policy pattern can be seen from the name. Strategies should be seen as different ways to achieve the same goal, while commands mean that even what you do is different. Also, because of the consistency of purpose, the information required by the policy pattern will be roughly the same. Because there is no inevitable relationship between the purposes of the command mode, it will inevitably lead to a great difference in the processing of the information needed. In addition, the command mode may also mean that there is a division of labor in the delivery and processing of requests.

Status and visitors

There is a big difference between the two patterns, whether in terms of usage scenarios or pattern structures. The similarity between them is that both of them are refactoring of existing code structures. The state mode centralizes the processing content separated by various conditional judgments into one state class, while the visitor pattern centralizes the operations for different objects that complete the same task in the same visitor class. The common advantage of the two is to enhance scalability; the common disadvantage is that it divides the original processing flow, which will take a little more trouble to understand. This is a higher level of similarity, in which the ideas are worth understanding and reference.

These are all the contents of this article entitled "what are the knowledge points of web behavior patterns?" Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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