blocks|key|2519829|text|您可以使用getcode码函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2519830|2519831|如果地址代表外部拥有的帐户，您将得到0x作为响应，否则您将得到契约的字节码。例如：|2519832|web3.eth.getCode("0xa5Acc472597C1e1651270da9081Cc5a0b38258E3")
"0x"|code-block|syntax|javascript|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgetcode^0|5|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|-4|5|6|7|W|8|@]|9|@]|C|$]]|$1|E|3|F|5|6|7|X|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|Y|8|@]|9|@]|C|$J|K]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

you can use <a href="https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgetcode" rel="noreferrer">getcode</a> function. 
if the address is representing an External Owned Account you will get 0x as response otherwise you will get the contract's bytecodeode.
for example :

<pre><code>web3.eth.getCode("0xa5Acc472597C1e1651270da9081Cc5a0b38258E3")
"0x"
</code></pre>

blocks|key|2519800|text|我在未来的一次更新中看到，他们计划将简单地址作为智能契约(统一和简化)来实现，因此，尽管您现在可能能够这样做，但一旦POS登陆，这可能是不可能的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

I read in one of the future updates they plan to make simple addresses be implemented as smart contracts (unifying and making things simpler) so while you might be able to do this now, it may not be possible once POS lands.

blocks|key|3663522|text|QuickBlocks中有一个名为isContract的命令行工具，它在给定地址后返回true/false。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3663523|isContract+0xd26114cd6ee289accf82350c8d8487fedb8a0c07|code-block|syntax|javascript|3663524|从命令行返回true。(地址是Omisigo。)|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Great-Hill-Corporation/quickBlocks/blob/master/src/tools/isContract/README.md^0|H|A|0|B|0|0|0|6|4^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]]]

There's a command line tool from <a href="https://github.com/Great-Hill-Corporation/quickBlocks/blob/master/src/tools/isContract/README.md" rel="nofollow noreferrer">QuickBlocks</a> called <code>isContract</code> which returns true/false given an address.

<pre><code>isContract 0xd26114cd6ee289accf82350c8d8487fedb8a0c07
</code></pre>

from the command line returns <code>true</code>. (The address is Omisigo.)

blocks|key|2519953|text|为其他遇到这个问题的人添加一个答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2519954|不受欢迎的观点:不要做，因为你做不到。|header-two|2519955|方法基于以下假设:代码大小为零，可靠地意味着调用方必须是EOA，这可能会带来安全风险。这是因为构造函数可以进行这样的调用，构造函数的地址将返回长度为0，因为那里还没有部署任何代码。|2519956|这会不会自动成为一个悲剧的缺陷？不一定，但很可能。|2519957|让我们把它拆开。|2519958|让我们假设一个人这么做是有原因的。必须有一些合理的关切，否则，这种歧视的企图将不必要地使问题复杂化。|ordered-list-item|2519959|但是，有一种方法可以绕过这一努力。|2519960|检查本身就指向作者所关注的代码部分，因此无论存在什么漏洞，都应该很容易发现。|2519961|部署特殊契约以利用该漏洞的要求非常简单。|2519962|总之，修补另一个坏主意似乎是个坏主意。不管关心的是什么，努力消除它。接受其他合同作为完全参与者是有好处的，而斗争它可能会导致麻烦。|2519963|据我所知，@AnAllergyToAnalogy首先指出了代码大小策略的问题。|2519964|合同如何确定另一个地址是否是合同？|offset|length|2519965|希望能帮上忙。|entityMap|0|LINK|mutability|MUTABLE|url|https://ethereum.stackexchange.com/questions/15641/how-does-a-contract-find-out-if-another-address-is-a-contract^0|0|0|0|0|0|0|0|0|0|0|0|0|H|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1B|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|1C|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|1D|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1E|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1F|8|@]|9|@]|A|$]]|$1|N|3|O|5|M|7|1G|8|@]|9|@]|A|$]]|$1|P|3|Q|5|M|7|1H|8|@]|9|@]|A|$]]|$1|R|3|S|5|M|7|1I|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1J|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1K|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1L|8|@]|9|@$Z|1M|10|1N|1|1O]]|A|$]]|$1|11|3|12|5|6|7|1P|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]]]

Adding an answer for others who come across this.
Unpopular opinion: Don't do it, because you can't do it.
Methods based on the assumption that code size of zero reliably implies that the caller must be an EOA will probably introduce a security risk. This is because a constructor can make such a call the constructor's address will return length 0 because no code is deployed there, yet.
Is that automatically a tragic defect? Not necessarily, but probably.
Let's break it down.
<ol>
<li>Let us assume that one is doing this for a reason. There must be some valid concern or else this attempt at discrimination would needlessly complicate matters.</li>
<li>But, there is a way to circumvent the effort.</li>
<li>The check, itself, points right at the section of code the author is concerned about, so whatever vulnerability might exist there should be easy to spot.</li>
<li>A requirement to deploy a special contract to exploit the vulnerability is trivial.</li>
</ol>
All in all, it seems like a bad idea to patch over another bad idea. Whatever the concern is, work on eliminating it. Accepting other contracts as full participants has advantages and fighting it will probably lead to trouble.
To the best of my knowledge @AnAllergyToAnalogy was first to point out the problem with the code size strategy.
<a href="https://ethereum.stackexchange.com/questions/15641/how-does-a-contract-find-out-if-another-address-is-a-contract">How does a contract find out if another address is a contract?</a>
Hope it helps.

blocks|key|2519894|text|除了Thomas的回答外，QuickBlocks现在似乎是Qblocks了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2519895|GitHub链接：https://github.com/Great-Hill-Corporation/trueblocks-core/blob/master/src/other/install/INSTALL.md|2519896|网址：https://quickblocks.io|2519897|另外，请参考我的答案在这个链接上。|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Great-Hill-Corporation/trueblocks-core/blob/master/src/other/install/INSTALL.md|1|https://quickblocks.io/|2|https://ethereum.stackexchange.com/questions/32106/is-there-a-way-to-know-the-contract-creation-address-from-a-the-transaction^0|D|B|T|7|0|9|2Q|0|0|3|M|1|0|A|6|2^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|I|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|J|3|K|5|6|7|19|8|@]|D|@$9|1A|A|1B|1|1C]]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]|S|$5|N|O|P|E|$Q|T]]|U|$5|N|O|P|E|$Q|V]]]]

To add to Thomas Jay Rush's answer, <code>QuickBlocks</code> seems to be now <code>Qblocks</code>.

GitHub Link: <a href="https://github.com/Great-Hill-Corporation/trueblocks-core/blob/master/src/other/install/INSTALL.md" rel="nofollow noreferrer">https://github.com/Great-Hill-Corporation/trueblocks-core/blob/master/src/other/install/INSTALL.md</a>

Website: <a href="https://quickblocks.io" rel="nofollow noreferrer">https://quickblocks.io</a>

Also, refer to my answer <a href="https://ethereum.stackexchange.com/questions/32106/is-there-a-way-to-know-the-contract-creation-address-from-a-the-transaction">at this link</a>.

I'm interested in knowing whether any particular address is a contract address or a standard address. There have been similar questions on the topic, but I'm not looking to detect whether an address is valid as this is child's play. 

I assume detecting a contract can be done, Etherscan does a good job at detecting addresses vs contracts. 

Any ideas?
Can this be done with web3?

How to detect if an address is a contract?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想知道具体地址是合同地址还是标准地址。在这个话题上也有类似的问题，但我并不是想检测一个地址是否有效，因为这是孩子的游戏。我认为检测合同是可以的，Etherscan在检测地址和合同方面做得很好。有什么想法吗？这能用web3来完成吗？

问如何检测地址是否为契约？
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回答 5

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