How to operate JS to implement transparency gradient animation

This time I will show you how to operate JS to achieve transparency gradient animation. What are theprecautions for operating JS to achieve transparency gradient animation? The following is a practical case, let’s take a look.

Summary:

2 . When changing the transparency, the transparency value cannot be obtained through a method similar to offsetLeft, so you need to create a separate variable
3. Don’t forget to assign the
timerto timer

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