试过用1像素的GIF，但还是有43字节，能不能更少点
data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==
data:,
data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=稍微短了一点.
试过用1像素的GIF，但还是有43字节，能不能更少点
data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==
data:,
data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=稍微短了一点.