问题
I have the following <img> tag in a static HTML document.
<img src="foo.gif" alt="This is an animated gif image, but it does not move"/>
After I set its src attribute to point to a .gif file (i.e. foo.gif), the GIF appears as a static (or non-moving) image. How do I animate the GIF?
回答1:
By default browser always plays animated gifs, and you can't change that behaviour. If gif image does not animate there can be 2 ways to look: something wrong with the browser, something wrong with the image. Then to exclude the first variant just check trusted image in your browser (run snippet below, this gif definitely animated and works in all browsers).
Your code looks OK.
Can you check if this snippet is animated for you?
If YES, then something is bad with your gif, if NO something is wrong with your browser.
<img src="http://i.stack.imgur.com/SBv4T.gif" alt="this slowpoke moves" width=250/>回答2:
try
<img src="https://cdn.glitch.com/0e4d1ff3-5897-47c5-9711-d026c01539b8%2Fbddfd6e4434f42662b009295c9bab86e.gif?v=1573157191712" alt="this slowpoke moves" width="250" alt="404 image"/>and switch the src with your source. If the alt pops up, try a different url. If it doesn't work, restart your computer or switch your browser.
来源：https://stackoverflow.com/questions/38309480/how-to-animate-gifs-in-html-document