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(This is because the platform sends the opening information twice in a row when making the order, causing the second information to close the business. This problem can be handled directly by contacting the online customer service.)Tan Weiwei喂，喂？你说什么？我这里信号不好。三个年轻足球运动员在一个虚构的英超俱乐部的不幸遭遇。For example, I now need to create a div element on the page. Then we definitely need a function to create the div, Now all I need is this function, which is only responsible for creating div elements. It doesn't want to take care of the rest, That is, to realize the principle of single responsibility, Just like Kissy on Taobao, At the beginning, they defined Kissy to do only one thing and did it well. The specific instantiation class in the monomer mode was handled by the agent function. The advantage of doing so was that the specific business logic was separated. The agent only cared about the business logic of the agent. Here, the function of the agent was to instantiate the object and instantiate it only once. Create div code just create div, the others don't care; The following code:We know that TCP protocol opens up a relatively large memory space backlog queue to store semi-connection entries. When SYN requests continue to increase, and this space causes the system to discard SYN connections. SYN cookies technology is designed to enable the server to process new SYN requests even if the semi-connection queue is full.