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These attacks usually use server resources rather than bandwidth from the server. They can also use the resources of network devices (such as firewalls, intrusion detection systems, and switches) on the periphery of the server. Examples include Smurf attacks (ICMP using broadcast IP spoofed IP), Fraggle attacks (same as Smurf, using UDP only), SYN flooding, dead pings (super large ICMP with the same destination and source IP and port), and many others.Since it is a content-based product, the foothold of the operation is content, and the final output form is also content. Therefore, in order to sort out a main line, the content needs to run through the whole process, and the final income is DAU or cash.Code as above; You can see, There are obvious shortcomings, For example, when I click on an element, I need to create a div. I click on the second element to create a div again, We frequently click on such and such elements, and they will frequently create div elements. Although we can remove pop-up codes when we click Close, it is not good for us to frequently create and delete them, especially for performance, and frequent operations on DOM will cause redrawing, etc., thus affecting performance. Therefore, this is a very bad habit. We can now use the monomer mode to realize the pop-up effect. We can instantiate it only once. The following code:Open the "Learning Power" client. On the welcome page, it is "It's a pleasure to learn while learning" from the Analects of Confucius. To use this client, you need to register your mobile phone number. After registration, it enters the main page. From the content point of view, it consists of 38 channels in the two major sections of "Learning" and "Video Learning". Among them, the "learning" section includes channels such as recommendation, news, new ideas, current politics synthesis, publication, practice, subscription, economy, figures, science and technology, culture, pictures, party history, personnel, law and discipline, international, 19 major time, documentary, allusions, current reviews, thinking, military, etc.2157年，人类文明的黄金时代，“自由探索集团”的飞行员们航行在宇宙中，22岁的宇航员马克西姆·卡梅尔驾驶的俄罗斯宇宙飞船，坠毁在遥远的有人居住的星球“萨拉什”，经过长年的核战争，环境危机笼罩了这个星球，社会问题成堆，建立的和平也很脆弱，这位勇敢的宇航员将会了解一片神秘的土地，在这里由五个匿名的统治者组成的“未知父亲”用特殊的发射器来操纵居民的意识，在这里马克西姆将会结识新朋友、树立敌人、找到真爱，电影在经过危险的审判之后，饥饿、致命的危害和损失将导致一场挑战五个贪婪的统治者的反抗运动...郑老太太乐呵呵地说：有，都有。