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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:通过发生在贝瓦和伙伴们身上的小故事，与小朋友产生心理共鸣，从而养成好习惯。少爷？少爷？耳边传来冬子的大喊声。四人一拍即合，决心合力伏妖，共同解决人界危机，拯救世间万物。一场正邪之战，就此展开......System.out.println ("this is the first sub! ");Dark mode. The color information of each channel and the mixed pixel color are examined, and the darker one is selected as the mixed result. The brighter pixels will be replaced by the darker pixels, while the darker pixels will not change.后院是小小三间抱厦，厅堂内摆了两桌，挤得满满当当的，正吃的欢。