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See the JavaScript addEventListener () section for both approaches.You are opposite and the whole family are all Assos. You are a card. Are you desperate?Reprint Statement: If there is no special explanation on this site, all articles are original. Please indicate the source for reprinting: Children's Programming Network, thank you! ^ ^The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?There is an eccentric person in our class. His name is Lin Nian. He is famous in the class and even in the whole school. Our class often calls him "Little BB".「或许能力不好，或许财力不够，但我从来没有怀疑过诚品的理念。。。。。。」—吴清友。吴清友广为人知的是在三十九岁时创立诚品，提供阅读与生活的美好体验；但鲜为人知的，是他年少叛逆与充满挫折的求学过程、浪漫与精明背后的心路历程。