暂停动画 GIF

// Freeze animated GIFs by drawing their first frame onto a static canvas.
function freezeGifs() {
  document.querySelectorAll('img[src$=".gif" i]').forEach(function (img) {
    if (img.dataset.jzFrozen) return;
    if (!img.complete || !img.naturalWidth) {
      img.addEventListener('load', freezeGifs, { once: true });
      return;
    }
    try {
      var c = document.createElement('canvas');
      c.width = img.naturalWidth;
      c.height = img.naturalHeight;
      c.getContext('2d').drawImage(img, 0, 0);
      img.src = c.toDataURL('image/png');
      img.dataset.jzFrozen = '1';
    } catch (e) {}
  });
}
freezeGifs();