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The fifth step is to write the implementation of each state class. It is worth noting that StateFactory is used to avoid the problems caused by the absence of abstract classes in javascript.91.01.10~91.12.12(木)UnicomThe life of the brand should gradually develop and grow with the passage of time. The extension of the brand is also developing and changing. This change is not only reflected in the extension of types, but also in the changes in the life cycle of single products themselves.In the above figure, when deleting the corresponding rules, the-D option is still used.-D INPUT means deleting the rules in the INPUT chain. The remaining options are the same as when we added the rules.-s means taking the corresponding source address as the matching condition, and-j ACCEPT means the corresponding action is accepted. Therefore, the above command means deleting the rules with the source address of 192.168. 1.146 and the action is ACCEPT in the INPUT chain.