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Let's start refactoring it step by step. The first step is still to provide the window.external.upload function to simulate the creation of the upload plug-in on the page. This part of the code has not changed:只杀敌，不表演。In addition to solving the port problem of A, the serial number problem also needs to be paid attention to. The serial number corresponds to the sliding window. The fake TCP packet needs to be filled with the serial number. If the value of the serial number is not in the sliding window of B when it is sent to B before A, B will actively discard it. So we need to find the serial number that can fall into the sliding window between AB at that time. This can be solved violently, because the length of a sequence is 32 bits, and the value range is 0-4294967296. If the window size is like 65535 under Windows I caught in the above figure, I only need to divide, and I know that at most I only need to send 65537 (4294967296/65535=65537) packets to have a sequence number fall into the sliding window. The desired value can be calculated quickly by exhaustion on multiple control hosts./v charge赵光头就此凝视杨长帆。However, there are exceptions. For example, in remote sensing　　组织成员多年前已南下香港，亦融入香港社会。某日，七金刚当年得师傅从中国来香港造访七人，要求他们参与一件中日交易事件，目的为夺取两张电脑软件。