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A device with a firewall or proxy can buffer SYN flooding attacks in the network in two ways, one is to disguise SYN-ACK packets for the connection initiator, and the other is to disguise ACK packets for the server [5].担任彻生公司保安的佐伯，把对差距和孤独的怨恨发泄给彻生，反复骚扰。Aunt Wang stamped her feet in regret: "I would have bought the genuine product if I had known it." This is the thinking of the poor-ignoring the "iceberg cost". What is iceberg cost? Even the visible cost is often only a very small part. The greater cost is hidden under invisible water.The above code: We use a parameter FN to pass it in, and if there is an instance of result, we will return it directly. Otherwise, the current getInstance function calls FN, and this pointer points to this FN function. After that, the return is saved in the result. Now we can pass a function in, whether it is to create div or iframe. In short, if this is the case, we can use getInstance to get their instance objects.② RecommendationH2deal![Book Club Reading Help]