受不了 spam 了
最近一段时间本 blog 的留言 spam 特别多，MT 默认自带的那个 anti-spam 插件不顶用了。今天 google 了一下 MT 插件的大概写法，登陆上服务器用 vi 临时写了个简单的插件。万一过年期间我不能上来清理留言的话，希望这个插件可以阻止 spam 泛滥。
大家这段时间留言时麻烦做一道小学数学题啊 :) 为了防止有读者忘记了怎么计算加法，我把答案也公布在题目后面了，只管照着填。记住要写阿拉伯数字，填汉字数字无效。如果你有注册发言，可以略过这一步。系统会优先承认注册登陆用户的评论。
等过完年再想想换个方法对付 spam ，尽量不降低用户体验。如果找到好方法的话，大家就可以放心订阅留言的 rss 了。
ps. perl 的语法真怪异。
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