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(double-click include click).Let's understand such a problem first, If our front-end development needs are the needs given to us by the demand side, It is possible that a front-end developer will deal with multiple demanders, Therefore, it will keep in touch with multiple demand parties. Then in the program it means keeping references to multiple objects, The larger the program, There will be more and more objects, The relationship between them will become more and more complicated. Now if there is an intermediary (if it is our supervisor) to meet the needs of multiple demanders, Then the demander only needs to give all the requirements to our supervisor, who will assign tasks to us according to our workload in turn. In this way, our front-end development does not need to contact with multiple business parties, we only need to contact our supervisor (i.e. Intermediary), which weakens the coupling between objects.Shooting Guard"Dioscorea cirrhosa dye"没错，徐风说的斩钉截铁，因为咱们是甲方，是出钱方，有的是商家排队等着跟咱们谈，你们所经手的每一个非长期性客户都是选项之一，除非公司有特殊交代，否则没必要让他们白白吃豆腐。So at the moment, We're on another machine, Use the ping command to send a message to the current machine. As shown in the following figure, the ping command can be responded to, proving that the message sent by the ping command has been normally sent to the host where the firewall is located. The IP address of the machine where the ping command is located is 146, and the IP address of the host currently testing the firewall is 156. We will use this environment to demonstrate the operation of iptables.祠堂中气氛肃穆，大家都对着神龛位叩拜，爷爷都说哭了，爹也说了许多话，大哥三哥也说了许多话，可是祖宗一直不吭声，他心里便有些莫名哀伤。