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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:电视剧《我在北京·挺好的》以上世纪八十年代到二十一世纪的现代都市为历史背景，跨越三十多年的风雨历程。以来自不同背景、性格迥异的于小芳、徐晓园这对亲姐妹各自不同的奋斗人生历程为主线。在事业与情感的层层纠葛中真实且细腻的展开了一副现代都市众生相。该剧讲述了本是亲姐妹，却在阴差阳错中被天各一方的由王茜华饰演的农村姑娘于小芳与由陶昕然饰演的北京女孩徐晓园在三十多年的风雨人生历程中，起伏不停的命运推动下成长与蜕变，最终战胜自我赢得成功与尊严的励志故事。李勇是海市刑警大队的大队长,正在侦办一起无名女尸案,上级却突然让他率警队调查一起走私案.缉私现场,检察院接到举报突然介入,竟然在李勇的车上发现价值十五亿元的钻石.李勇被双规.当刑警队追踪集装箱私货的源头时,发现私货货主孟恩被杀.李勇决定逃亡,要为自己洗清冤屈. 陆向东是李勇最信任...赵思萍冲沈悯芮解释了一句，心中立刻有了思量，凑在杨寿全耳边小声道，此女仪表出众，谈吐得当，长贵……也到了阳气正盛的年龄。森永高中由互看不顺眼的\"北校区文化生\"和南校区体育生组成，两校区在“你死我活\"模式下相处多年，水火不容。这一年，学校为瞻应上级政策决定“文体”两校区合并。这条消息让学生们彻底作开了锅，要命的是：北校区的学器元彩希，明泽羽和南校区的扛把干尹正赫都被升到了三年二组，还成为了同桌！从此森永高中开启了\"易燃易爆炸\"的合班新纪元。从“对立，到“理解\"少年们共同成长，联手为荣誉面战。