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Through a short example-console debugging, this paper understands the whole process of event handling. The following is the test code. Using the console, you can clearly see the parameter changes during the function execution and the module to which the method belongs-the call stack, so there are many pictures in this article.背水一战。According to Microsoft statistics, the upper limit of dynamic domain name queries that a DNS server can withstand is 9,000 requests per second. However, we know that tens of thousands of domain name resolution requests per second can be easily constructed on a P3 PC, which is enough to paralyze a DNS server with extremely high hardware configuration, thus showing the vulnerability of the DNS server. At present, the most commonly used DNS server software is the leading WINMYDNS in China and Bind abroad.现在边疆的战事是有龙且、虞子期等人在指挥，战局暂时陷入一种胶着状态，难分胜负。王无忌是清末大刀王五的幼子，王五因救谭嗣同而遭清帮魔头练辟邪杀害，其家人亦一同被杀，仅无忌幸免于难，随醉乞学习醉拳。 　　无忌长大后，出为江湖行走，遇到许多事情，首先被卷入盗慈禧墓的事件中，与邪派人物发生冲突，又因要报杀父之仇，杀练避邪，无忌得机拜剑仙为师学艺，并邂逅仙儿及醉娃 ，与剑仙之子小剑仙成为好友，四个青年侠士之间，发生了一段动人的情场追逐战，形成纠缠不清的情仇恩怨，英雄气短，儿女情长。 　　无忌屡遇风险，在江湖上，历尽各种磨练，培养出坚毅不移的性格，同时他为人正义，大仁大勇，很得正派武林人士看重，亦得到魔仙之女的垂青，可惜他身负大仇，一心要手刃杀父仇人，致难以兼顾爱情，令内心添了不少苦恼！