javascript star rating effect (handwritten)_javascript skills

I took the time this morning to write down a star rating effect and share it with you. Since the level is limited, please point out if you have any questions.
First, prepare a picture of a star. Gray is the default state and yellow is the selected state. As shown in the picture:
Attach the code at the end:

Copy the code The code is as follows:

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AttachedDownload address
PS: These are some effects that I wrote at will through the javascript knowledge I learned when I was idle and bored.