blocks|key|3131957|text|我很犹豫要不要回答你的问题，因为这听起来像是在危险地接近邪恶……而且，它注定要失败。如果你真的想阻止用户多次回答测验，你可以做的最好的事情是让他们注册一个用户帐户。如果你想阻止他们注册多个用户帐户，你可以让他们通过信用卡或蜗牛邮件进行验证，这两种解决方案通常都是站不住脚的。简而言之，互联网是匿名的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3131958|无论如何，如果你真的想继续这个计划，你可以用Flex+(Flash的一种变体)构建你的应用程序。Adobe网站上有大量的文档。其中一些是相当稀疏和恼人的，特别是集合API，但它足以满足您的目的。ActionScript+(+Flash和Flex的底层编程语言)与JavaScript非常相似，也很容易学习。Flex有一个免费的SDK+(通常在页面上的一个小链接中，它告诉你可以获得昂贵的Flex+Builder；Flex+Builder主要是一个GUI工具，而你将在没有IDE的情况下直接编写代码，只有SDK)，所以许可证应该不是问题。JavaScript到闪存的桥也有很好的文档记录。|3131959|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I'm hesitant to answer your question, because it sounds like this is straying dangerously close to Evil... Also, it's doomed to failure. If you really want to prevent a user from answering a quiz multiple times, the best thing you can do is have them register a user account. If you want to prevent them from registering multiple user accounts, you can have them verify something through a credit card or snail mail, both of which are generally untenable solutions. In short, the internet is anonymous.

Anyways, if you really want to go forward with this plan, you can build your application in Flex (a variant of Flash) fairly trivially. There's tons of documentation on the Adobe site. Some of it is rather sparse and annoying, particularly the collections API, but it'll be sufficient for your purposes. ActionScript (the programming language underlying both Flash and Flex) is very much like JavaScript and easy to learn. Flex has a free SDK (usually available in a small link from the page that tells you to get the expensive Flex Builder; Flex Builder is a primarily GUI tool, whereas you'll be writing straight code without an IDE with just the SDK), so a license shouldn't be a problem. The JavaScript to Flash bridge is also well documented.

blocks|key|350987|text|对于现在正在搜索它的人，请务必查看evercookie。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|350988|entityMap|0|LINK|mutability|MUTABLE|url|http://samy.pl/evercookie/^0|H|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

For people searching for this now, be sure do check out <a href="http://samy.pl/evercookie/" rel="nofollow">evercookie</a>.

blocks|key|3344798|text|Evercookie绝对可以完成这项工作，但这更接近于您最初要求的：https://github.com/nfriedly/Javascript-Flash-Cookies麻省理工学院许可证。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3344799|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nfriedly/Javascript-Flash-Cookies^0|Y|1G|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Evercookie definitely gets the job done, but this is a little closer to what you were originally asking for: <a href="https://github.com/nfriedly/Javascript-Flash-Cookies" rel="nofollow">https://github.com/nfriedly/Javascript-Flash-Cookies</a> MIT license.

blocks|key|352151|text|BakedGoods似乎正是你需要的(或者更确切地说，是你确实需要的)；它是一个Javascript库，它建立了一个统一的接口，可以用来在所有本机和一些非本机存储设施中执行常见的存储操作，包括闪存本地共享对象(您所说的“cookie”)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|352152|有了它，创建LSO就可以通过如下代码来完成：|352153|bakedGoods.set({
++++data:+[{key:+"key",+value:+"value"}],
++++storageTypes:+["flash"],
++++complete:+function(byStorageTypeRemovedItemKeysObj,+byStorageTypeErrorObj){/*code*/}
});|code-block|syntax|javascript|352154|检索和删除数据也同样简单。相信我，我会知道的；我是它的维护者:)|352155|352156|如果出于任何原因，您希望推出自己的解决方案，rmeador和ForYourOwnGood已经为您提供了足够的信息来帮助您入门。|352157|然而，他们忘了告诉你如何做一件非常重要的事情：如何使用Javascript访问将处理共享对象的Actionscript代码。|style|BOLD|352158|首先，您需要将ActionScript代码封装在一个方法中，然后将该方法注册为其父应用程序的ExternalInterface的一部分：|352159|function+handleObjects(/*param1,+param2,+...+*/):void+{/*code*/}
ExternalInterface.addCallback("handleObjects");|352160|其次，您需要编译Actionscript应用程序(代码)，并在HTML中创建一个引用生成的.swf文件的元素。|352161|然后，假设前面提到的HTML元素表示为一个名为flashDOMElement的DOMElement，您可以使用DOMElement调用您的方法：|CODE|352162|flashDOMElement.handleSharedObjects(/*arg1,+arg2,+...+*/);|352163|就是这样！有几件事我们没有提到或略过，但总而言之，推出自己的解决方案并不难。然而，推出您自己的可靠解决方案则是另一回事，这也是我建议您使用BakedGoods的部分原因。|352164|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/klawson88/Baked-Goods^0|0|A|0|0|0|0|0|0|0|N|N|0|0|0|0|N|F|0|0|1B|2|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]]|C|$]]|$1|D|3|E|5|6|7|1I|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1J|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1K|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1M|8|@]|9|@]|C|$]]|$1|P|3|Q|5|6|7|1N|8|@$A|1O|B|1P|R|S]]|9|@]|C|$]]|$1|T|3|U|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|V|3|W|5|H|7|1R|8|@]|9|@]|C|$I|J]]|$1|X|3|Y|5|6|7|1S|8|@]|9|@]|C|$]]|$1|Z|3|10|5|6|7|1T|8|@$A|1U|B|1V|R|11]]|9|@]|C|$]]|$1|12|3|13|5|H|7|1W|8|@]|9|@]|C|$I|J]]|$1|14|3|15|5|6|7|1X|8|@$A|1Y|B|1Z|R|S]]|9|@]|C|$]]|$1|16|3|-4|5|6|7|20|8|@]|9|@]|C|$]]]|17|$18|$5|19|1A|1B|C|$1C|1D]]]]

<a href="https://github.com/klawson88/Baked-Goods" rel="nofollow">BakedGoods</a> seems to be exactly what you need (or rather, what you did need); its a Javascript library that establishes a uniform interface that can be used to conduct common storage operations in all native, and some non-native storage facilities, including Flash Locally Shared Objects (the "cookies" you speak of).

With it, creating an LSO can be accomplished with code as simple as:

<pre><code>bakedGoods.set({
 data: [{key: "key", value: "value"}],
 storageTypes: ["flash"],
 complete: function(byStorageTypeRemovedItemKeysObj, byStorageTypeErrorObj){/*code*/}
});
</code></pre>

Retrieving and removing data is just as easy. Trust me on all of this, I would know; i'm its maintainer :)

<hr>

If for whatever reason you'd prefer to roll out your own solution, rmeador and ForYourOwnGood have supplied you with enough information to help you get started. 

They've forgot to tell you how to do one very important thing, however: how to access, with Javascript, the Actionscript code that will handle the Shared Objects.

First, you will need to encapsulate your ActionScript code in a method, and then register that method as part of the ExternalInterface of its parent application:

<pre><code>function handleObjects(/*param1, param2, ... */):void {/*code*/}
ExternalInterface.addCallback("handleObjects");
</code></pre>

Second, you will need to compile your Actionscript application (your code), and create an element in your HTML that references the resultant .swf file.

Then, assuming the aforementioned HTML element is represented as a DOMElement named <code>flashDOMElement</code>, you can call your method with the DOMElement: 

<pre><code>flashDOMElement.handleSharedObjects(/*arg1, arg2, ... */);
</code></pre>

And that's it! There are a couple of things that we've failed to mention or skimmed over, but all in all, rolling out your own solution is not hard. Rolling out your own reliable solution, however, is a different matter, which is partly why I suggest you use BakedGoods.

After reading this on the question <a href="https://stackoverflow.com/questions/216542/how-do-i-uniquely-identify-computers-visiting-my-web-site#216599">How do I uniquely identify computers visiting my web site?</a>
:

<blockquote>
 A possibility is using flash cookies:

<pre><code>Ubiquitous availability (95 percent of visitors will probably have
</code></pre>
 
 flash)

<pre><code>You can store more data per cookie (up to 100 KB)

Shared across browsers, so more likely to uniquely identify a machine

Clearing the browser cookies does not remove the flash cookies.
</code></pre>
 
 You'll need to build a small (hidden)
 flash movie to read and write them.
</blockquote>

I tried to find if someone has already done something like this, so I wouldn´t have to reinvent the wheel. So far, no luck(maybe I don´t know the right term to search), except for the <a href="http://blog.circlecube.com/2008/04/tutorial/shared-object-utilizing-the-flash-cookie/" rel="nofollow noreferrer">code in the flash side</a>

The use I have for this is to prevent a user to answer a quiz multiple times, but future uses maybe banning trolls.

Does anyone knows a open source library that does this and allows me to access via javascript?

Caveats: I don't know flash and I don't own a license.

Edit: You can do that using <a href="http://samy.pl/evercookie/" rel="nofollow noreferrer">evercookie</a>. It's kind of evil, but works.

Javascript bridge to Flash to store SO "cookies" within flash

在问题上阅读了这篇文章后：一种可能是使用闪存cookies：无处不在的可用性(95%的访问者可能会有flash)对于跨浏览器共享的每个cookie (最多100 KB)，您可以存储更多数据，因此更有可能唯一标识计算机清除浏览器cookie不会删除flash cookie。你需要创建一个小的(隐藏的) flash电影来读...

问Javascript桥接到Flash以在flash中存储SO "cookies“
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