During this period of time, when I used Internet Explorer to surf the Internet, everything with GIF animations was still. It was very strange. After checking, it turned out that the animation item in the playback page in IE settings had been canceled.

Solution: Open IE, click Tools--Internet Options--Advanced--Multimedia---Play the animation on the webpage and check it.

I haven't touched the IE settings normally, but how could it suddenly be changed? It's really weird.