这不是跨浏览器的解决方案，但是可以在Firefox和Opera中使用（不适用于ie8：-/）。采取从这里
[].slice.apply(document.images).filter(is_gif_image).map(freeze_gif);
function is_gif_image(i) {
return /^(?!data:).*\.gif/i.test(i.src);
}
function freeze_gif(i) {
var c = document.createElement('canvas');
var w = c.width = i.width;
var h = c.height = i.height;
c.getContext('2d').drawImage(i, 0, 0, w, h);
try {
i.src = c.toDataURL("image/gif"); // if possible, retain all css aspects
} catch(e) { // cross-domain -- mimic original with all its tag attributes
for (var j = 0, a; a = i.attributes[j]; j++)
c.setAttribute(a.name, a.value);
i.parentNode.replaceChild(c, i);
}
}
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