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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:1960年，年轻技术员常汉卿刚留学回来，与从铁道兵部队转业分配到厂里来的女战斗英雄金灿烂相遇了。他们从互相看不顺眼到相知、相爱，克服了来自家庭和外界的干扰，最终结合在了一起。婚后他们一起克服来自生活的种种困难、研究技术，花费了毕生精力共同为我国电力机车的研发、建造作出努力。岁月变迁后，他们的孩子也最终选择了机车建造这一专业，并为我国建造出了世界一流的高铁。一个小男孩在一群基于宝石的生物中取代了母亲的位置，必须学会控制自己的力量。你且忍耐两年……声音渐低渐轻，细不可闻，丁香儿则抹着眼泪不住点头。李玉娘眼中含着泪水，一时间有些伤感。3张槐也道：不错。