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In CommonJS's specification, each JavaScript file is a separate module context, in which the attributes created by default are private. In other words, variables defined in one file (including functions and classes) are private and invisible to other files.In real life, there are many requests that cannot be made by one person. For example, the salary at the interview may be decided by the technical manager if it is less than 10,000, but the salary between 10,000 and 15,000 may not be approved by the technical manager and may need to be approved by the technical director.Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.　　“魔高一尺，道高一丈”，与此同时，警方已密切注意这股强劲的黑势力，并进行追踪调查，乔云风万万没有想到自己最信任，最亲密的女人却是自己身败名裂的底牌……If the fire-fighting facilities maintenance and testing institution fails to publicize the fire-fighting technical service information on the conspicuous position of the building where the fire-fighting facilities repaired and maintained by the institution or on the fire extinguisher in accordance with these Provisions, it shall be ordered to make corrections and fined not more than 5,000 yuan.想像着很不容易，可虎子和黑娃两脚各踩一根两尺长、半尺宽的木板，在沼泽地里跑得飞快，手上竹竿不住挥动，四下兜鸭蛋，真个如履平地。Here, the filter gateway mainly indicates the firewall, and of course the router can also become the filter gateway. Firewall is deployed between different networks to prevent foreign illegal attacks and the leakage of confidential information. It is located between the client and the server. Using it to protect SYN attacks can play a very good role. Filter gateway protection mainly includes timeout setting, SYN gateway and SYN agent.