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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:这两个全新的系列将承诺从史蒂夫彭伯顿和瑞斯希史密斯聪明的头脑更幻想扭曲的故事。[Resist DDoS Attacks]: Seven Tips to Remember.旺天生智力已比常人发展缓慢，年介三十岁，但智商只有七岁小孩水平。旺怀着一颗赤子童心，待人处事态度简单直接。即使遇上挫折，凭着他屡败屡战的精神，最后都会获得成功。Solidago canadensisIn some first-tier cities, operators have to increase the number of 5G base stations while ensuring the operation of 4G base stations, which will increase the difficulty and financial pressure accordingly.