Js control fade-in and fade-out example code _ javascript skills

I think you have seen the fade-in and fade-out effect. This article will introduce how to use js to control the fade-in and fade-out. Interested friends can refer to the below for more information, it is not very practical. It may be possible that four jquerystatements can solve the problem. However, native has a relatively reference, and understanding the final principle is the key.

The Code is as follows:

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