I've had some success by making the image a background of a DIV (instead of using an IMG element). Most spam bots ignore background CSS styles.
If you want to make life a little bit harder for the spammers, leave the IMG in, use an different image in there, and set it to display: none;. The bot will have a hard time to figure out that the IMG isn't visible.
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我通过将图像作为 DIV 的背景（而不是使用 IMG 元素）取得了一些成功。大多数垃圾邮件机器人都会忽略背景 CSS 样式。
如果您想让垃圾邮件发送者的日子更不好过，请保留 IMG，在其中使用不同的图像，并将其设置为
display: none;。机器人将很难发现 IMG 不可见。I've had some success by making the image a background of a DIV (instead of using an IMG element). Most spam bots ignore background CSS styles.
If you want to make life a little bit harder for the spammers, leave the IMG in, use an different image in there, and set it to
display: none;. The bot will have a hard time to figure out that the IMG isn't visible.FUDForum 对我来说比较好一些。它几乎是免提的，我已经安装了一些。到目前为止，没有垃圾邮件，没有机器人。
我相信 fudforum 能够在垃圾邮件机器人挑战中幸存下来的原因是因为它使用 ASCII 文本作为验证码。您可以尝试在其他论坛中重复使用它。
FUDForum is somewhat better for me. It has been pretty much hands free and I have installed a few. So far no spam no bots.
The reason I believe fudforum has survived spam bot challenge is because it uses ASCII text for captcha. You could try to reuse it in other forums.