是否可以检查是否有人试图从同一台计算机投票
据我所知，这个问题的答案是否定的，但我可能遗漏了一些东西。有一些投票网站声称禁止使用同一台计算机投票，这将导致被禁止。他们如何检测到这一点？作弊者可能会使用可路由的 IP、不同的操作系统、不同的浏览器、代理等。
From my knowledge the answer to this question is no, but i might be missing something. There are some polling sites which claim that voting from the same computer is forbidden and will result in a ban. How can they detect that? A cheater may use routable IPs, different operating systems, different browsers, proxies etc.
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Cookie，并假设多帐户作弊者迟早会忘记清除 Cookie 或使用错误的浏览器，然后他们就会抓住他。
Cookies, and assumption that the multi-account cheater will sooner or later forget to clear cookies or use wrong browser and they will got him.
总结一下我能找到的一切：答案是否定的。您无法 100% 确定用户正在尝试从同一台计算机投票。防止这种情况的高级解决方案是检查 IP，并可能使用 Java 小程序找出用户的计算机帐户名，并且可能对来自该 IP 的投票数设置限制。此外，无论如何，人类都应该筛选结果，看看其中有多少 IP 属于机构或大学校园街区，并决定是否保留这些选票，如果你真的想彻底的话。收集尽可能多的有关投票者的信息是有用的（操作系统、浏览器、引荐来源网址、插件等）。其他技巧包括在验证投票之前检查投票者是否首先访问了服务器上的多个资源，并且在验证投票时不给出负面反馈这并不能降低欺诈企图的可能性。
To sum up all that I could find: the answer is no. You can't be 100% sure that the user is trying to vote from the same computer. Advanced solutions to prevent this is to check the IP and, using maybe a java applet, find out the user's computer account name, and maybe set a limit to the number of votes coming from that IP anyway. Also, a human should be screening the results anyway and see how many of those IPs belong to institutions or college campus blocks, and make decisions to keep those votes or not, if you really want to be thorough. Gathering as much information about the voter as you can is useful (OS, browser, referrer, plug-ins etc.) Other tricks involve checking if the voter has visited several resources from your server first before validating his vote and not giving negative feedback when this fails to make fraud attempts less likely.