As the title says, I use a layer pop-up window, and the content in the content is injected with the ID. This part of the content is display:none on the page, which is hidden. When I click on the pop-up window, the content inside can be displayed. out, but after closing the pop-up window, this part of the content is displayed on the page. 
Solution....
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In the end method of the layer, re-execute the following display: none
After closing, reset and clear the part of the content you injected