How to use native js to simply encapsulate the confirm pop-up box

Due to the needs of the project, I made a super simple pop-up box, which will pop up as soon as the page is opened. Since the project director said that it should be as small as possible (less introduction of encapsulated file packages), native js was used (I found that jQuery is basically used on the Internet). Without further ado, let’s get into the code

     
  
 
 X 
 提示 
 
 是否要退出登录？ 
 
   
 
 
   

to achieve the effect ：

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