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Sakamoto COO Wang BoIn the historical substitution principle, the methods of the subclass to the parent class should not be overridden or overloaded as far as possible. Because the parent class represents a well-defined structure, subclasses should not destroy it casually by interacting with the outside world through this standardized interface.Mozart's Perfect Pitch//002众人参加洛根李的葬礼，但洛根李复活归来了。最后的战争开始，朱丹泰出狱，还放狠话说“沈秀莲会死！”浴室，割腕自杀的里奇（肖恩·克里斯汀森 Shawn Christensen饰）突然接到关系疏远的姐姐玛姬（金·艾伦 Kim Allen饰）的电话，恳求他去照顾九岁的侄女索菲娅（法蒂玛·普泰西克 Fatima Ptacek饰）几个小时。在里奇生命的最低谷，本来想放弃生命的他还是勉为其难的答应了。洗掉身上的血渍，包扎好伤口，里奇开始了照看索菲娅的任务。几天的相处，索菲娅慢慢接纳了叔叔里奇并依赖上了他。当里奇再次准备割腕自杀的时候，电话又一次响起……老君上回头瞧了一眼，显然也极为惊诧，剑招上却毫不放松，想要将尹旭留下。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: