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我这辈子再不回东南了。黑子呜咽一声倒地。Application Scenario 3: Security Agent, which is used to control the access rights of real objects. It is generally used when objects should have different access rights.小葱轻笑道：如此，多谢王翰林了。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:范先生，请你们进去相见。