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The difference between synchronous and asynchronous lies in the second stage. If the requester actively obtains the data, it is a synchronous operation. It should be noted that the read/write operation is also "blocked" until the data is read.随着国内改革的开放,各国贸易集团纷纷进入这个广大的市场,国内的企业家也在这波热潮中,积极寻找合作的伙大唐盛世，锦绣繁华。在造船业发达的滨海小镇常乐，人类女子陆漓女扮男装混入造船厂，希望能在船厂大展身手，实现自己扬帆远航的梦想，鲛人王子吴居蓝也带着神秘任务来到船厂，两人不打不相识，产生了纯洁的爱情。随着陆漓和吴居蓝的相爱，两人背后的阴谋也逐渐浮出了水面，陆漓在亲情和爱情之间痛苦挣扎。最终，陆漓和吴居蓝用爱化解了仇恨，人类和鲛人终于和平共处，同享盛世繁华。NTP (Network Time Protocol) is a common protocol used to provide time synchronization services. It is a typical UDP-based protocol, which is quite old and did not consider authentication in the original design, so it is an ideal hacker to use.For the first point, we also often use it in our daily work, such as our Ajax request, which has a success and error callback function, and we can subscribe to Ajax success and error events. We don't care about the state of the object running asynchronously, we only care about success or error when we have to do something of our own ~韩庆见老爷开口，都没要来这银子，觉得四少爷待他真没话说。It will be helpful to practice effectively and deliberately when there is no mentor, as long as you firmly remember the three F's.