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Applicable scenario: If you have a small number of connections that use very high bandwidth and send a large amount of data at a time, perhaps the typical IO server implementation may fit very well.If the spam sent by CSRF still has worm links, those friends who receive these harmful information will become the spread of harmful information in case they open the connection in the private letter, thus tens of thousands of users will be stolen and planted Trojan horses. The application of the whole website may collapse in an instant, with users complaining, users losing, the company's reputation plummeting and even facing bankruptcy. Once on MSN, Samy, a 19-year-old American boy, used CSS's Background vulnerability to successfully infect more than 1 million users with his worm within a few hours. Although the worm did not destroy the entire application, it only added "Samy is my idol" after each user's signature, but once these vulnerabilities were exploited by malicious users, the consequences would be unimaginable, and the same thing happened on Sina Weibo.Another example is that a big sword will have the same effect, but it is worth mentioning that whether the weapon has sufficient contact with the BOSS will also affect the weakness damage. For example, if the same part is completely cut, it will be yellow, while only the tip of the sword will be wiped, and only about half of the damage will be white.Using monomer mode can make the code organization more consistent and make the code easy to read and maintain.? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages: