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This example executes 85 lines, where the type is click, func is the event handler, and event is the composite event object.The following contents of this article are all aimed at CC attacks.If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.Also, you can register multiple delegates for an event with + =.Even if you don't want to talk about it now for some reason陈启耸耸肩说道：有跌才有涨。凌海市发生一起连环杀人案，让刑警季凡与队长熊振男、法医赵清妍等人联手展开调查。然而案件扑朔迷离，始终无法破获。随着调查的深入，季凡逐渐惊觉凶手似乎就在身边，看似简单的连环杀人案，却牵扯出一桩27年前的旧案，被时光掩埋的真相缓缓揭开，杀人凶手正是与季凡朝夕相处的父亲季廷山和哥哥季平，而季平却替季凡背负了27年的复仇重任。随着季廷山被捕，季平负伤逃到海外，季凡追寻他的踪迹来到曾经长大的第二故乡欧洲某国。季凡一边追查季平的下落，一边还要完成组织上委派的卧底任务，找出隐藏在三大黑帮家族幕后的操控人A先生，破解黑帮圣物“圣杯”中的秘密，被卷入欧洲某国黑帮的争斗中。在捷克警方的协助下，季凡终于查到A先生真实身份，而季平的目标居然也是A先生，而这一切也跟俩人的过往有着千丝万缕的关系。