blocks|key|814008|text|navigator对象包含您需要的所有信息。这应该可以做到：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|814009|navigator.userAgent.indexOf("Opera");|code-block|syntax|javascript|814010|entityMap^0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

The <code>navigator</code> object contains all the info you need. This should do:

<pre><code>navigator.userAgent.indexOf("Opera");
</code></pre>

blocks|key|814105|text|if(window.opera){
++++//do+stuffs,+for+example
++++alert(opera.version());+//10.10+
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|814106|不是开玩笑，opera浏览器中有一个对象opera。|unstyled|offset|length|style|CODE|814107|你可能认为，对象opera是可重写的，但navigator也是可重写的。|814108|更新|BOLD|814109|要获得更准确的结果，您可以这样做|814110|if+(window.opera+&&+opera.toString()+==+"[object+Opera]"){
++++//do+stuffs,+tested+on+opera+10.10
}|814111|我注意到，Opera同时有addEventListener和attachEvent，所以还有另一种方式，比如|814112|if+(window.addEventListener+&&+window.attachEvent){
++++//do+stuffs,+tested+on+opera+10.10
}|814113|entityMap^0|0|K|5|0|8|5|K|9|0|0|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|10|8|@$G|11|H|12|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|13|8|@$G|14|H|15|I|J]|$G|16|H|17|I|J]]|9|@]|A|$]]|$1|M|3|N|5|F|7|18|8|@$G|19|H|1A|I|O]]|9|@]|A|$]]|$1|P|3|Q|5|F|7|1B|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1C|8|@]|9|@]|A|$B|C]]|$1|T|3|U|5|F|7|1D|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1E|8|@]|9|@]|A|$B|C]]|$1|X|3|-4|5|F|7|1F|8|@]|9|@]|A|$]]]|Y|$]]

<pre><code>if(window.opera){
 //do stuffs, for example
 alert(opera.version()); //10.10 
}
</code></pre>

No kidding, there is an object <code>opera</code> in opera browser.

You may think, object <code>opera</code> is overridable, but <code>navigator</code> is overridable too.

UPDATE:

To get more accurate result, you could do like

<pre><code>if (window.opera &amp;&amp; opera.toString() == "[object Opera]"){
 //do stuffs, tested on opera 10.10
}
</code></pre>

And I noticed, Opera have both addEventListener and attachEvent, so there is also another way like

<pre><code>if (window.addEventListener &amp;&amp; window.attachEvent){
 //do stuffs, tested on opera 10.10
}
</code></pre>

blocks|key|673636|text|上面的答案在新的Opera+30中不再有效。因为Opera现在使用的是铬。请使用以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673637|var+isChromium+=+window.chrome,
++++isOpera+=+window.navigator.userAgent.indexOf("OPR")+>+-1+%7C%7C+window.navigator.userAgent.indexOf("Opera")+>+-1;
if(isChromium+!==+null+&&+isOpera+==+true)+{
+++//+is+Opera+(chromium)
}+else+{+
+++//+not+Opera+(chromium)+
}|code-block|syntax|javascript|673638|新的Opera30版本现在完全使用了Chromium，并将其userAgent更改为OPR|offset|length|style|BOLD|CODE|673639|entityMap^0|0|0|2|7|I|8|16|3|U|9|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|R|8|@$I|S|J|T|K|L]|$I|U|J|V|K|L]|$I|W|J|X|K|L]|$I|Y|J|Z|K|M]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|O|$]]

The above answers no longer work in the new Opera 30. Since Opera now use Chromium. Please use the below:

<pre><code>var isChromium = window.chrome,
 isOpera = window.navigator.userAgent.indexOf("OPR") &gt; -1 || window.navigator.userAgent.indexOf("Opera") &gt; -1;
if(isChromium !== null &amp;&amp; isOpera == true) {
 // is Opera (chromium)
} else { 
 // not Opera (chromium) 
}
</code></pre>

The new Opera 30 release now fully uses Chromium and also changed their <code>userAgent</code> to OPR

blocks|key|2222577|text|在Prototype.js中，we+use+this+inference|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2222578|var+isOpera+=+Object.prototype.toString.call(window.opera)+==+'[object+Opera]';|code-block|syntax|javascript|2222579|这实质上是检查window.opera对象是否存在，以及它的内部[Class]值是否为"Opera“。这是一种比仅仅检查window.opera是否存在更可靠的测试，因为一些不相关的全局opera变量阻碍并导致误报的可能性要小得多。|style|CODE|2222580|说到不相关的全局变量，请记住，例如，在MSHTML+DOM中，元素可以通过id/name全局解析；这意味着在标记中出现类似<a+name="opera"+href="...">foo</a>的内容将导致window.opera引用该锚元素。这就是你的假阳性。|2222581|换句话说，测试[Class]值，而不仅仅是存在。|2222582|当然，在搜索浏览器之前一定要三思而后行。通常有更好的方法来解决问题;)|2222583|附注:将来的歌剧版本有可能改变window.opera的[类]，但这似乎不太可能。|2222584|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/sstephenson/prototype/blob/master/src/prototype.js#L14^0|F|L|0|0|0|7|C|1O|C|2L|5|0|1P|Y|2T|C|0|0|0|F|C|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|17|8|@$A|18|B|19|K|L]|$A|1A|B|1B|K|L]|$A|1C|B|1D|K|L]]|9|@]|C|$]]|$1|M|3|N|5|6|7|1E|8|@$A|1F|B|1G|K|L]|$A|1H|B|1I|K|L]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1J|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1K|8|@]|9|@]|C|$]]|$1|S|3|T|5|6|7|1L|8|@$A|1M|B|1N|K|L]]|9|@]|C|$]]|$1|U|3|-4|5|6|7|1O|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

In Prototype.js, <a href="http://github.com/sstephenson/prototype/blob/master/src/prototype.js#L14" rel="noreferrer">we use this inference</a>:

<pre><code>var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
</code></pre>

This essentially checks that <code>window.opera</code> object exists and its internal [[Class]] value is "Opera". This is a more solid test than just checking for <code>window.opera</code> existence, since there's much less chance of some unrelated global <code>opera</code> variable getting in the way and resulting in false positives.

Speaking of unrelated global variable, remember that in MSHTML DOM, for example, elements can be resolved by id/name globally; this means that presence of something like <code>&lt;a name="opera" href="..."&gt;foo&lt;/a&gt;</code> in a markup will result in <code>window.opera</code> referencing that anchor element. There's your false positive...

In other words, test [[Class]] value, not just existence.

And of course always think twice before sniffing for browser. Oftentimes there are better ways to solve a problem ;)

P.S. There's a chance of future versions of Opera changing [[Class]] of <code>window.opera</code>, but that seems to be unlikely.

blocks|key|673544|text|你介意用jQuery吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673545|然后，您可以使用jQuery.browser+(see+documnentation)|offset|length|style|CODE|673546|但是jQuery-guys建议不要使用这个。|673547|673548|我们建议不要使用此属性，请尝试使用功能检测(请参阅jQuery.support)|blockquote|673549|673550|673551|编辑：|BOLD|673552|对于Mootools:使用window.opera+(参见documentation)|673553|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.jquery.com/Utilities/jQuery.browser|1|http://docs.jquery.com/Utilities/jQuery.support|2|http://docs111.mootools.net/#window^0|0|8|E|O|I|0|0|0|0|P|E|1|0|0|0|0|3|0|D|C|T|D|2|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@$D|1A|E|1B|1|1C]]|A|$]]|$1|H|3|I|5|6|7|1D|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1F|8|@]|9|@$D|1G|E|1H|1|1I]]|A|$]]|$1|N|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1L|8|@$D|1M|E|1N|F|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1O|8|@$D|1P|E|1Q|F|G]]|9|@$D|1R|E|1S|1|1T]]|A|$]]|$1|U|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]|14|$5|X|Y|Z|A|$10|15]]]]

do you mind using jQuery?

then you can use <code>jQuery.browser</code> (<a href="http://docs.jquery.com/Utilities/jQuery.browser" rel="nofollow noreferrer">see documnentation</a>)

But the jQuery-guys recommend not to use this.

<blockquote>
 We recommend against using this
 property, please try to use feature
 detection instead (see <a href="http://docs.jquery.com/Utilities/jQuery.support" rel="nofollow noreferrer">jQuery.support</a>)
</blockquote>

Edit:

For Mootools: use <code>window.opera</code> (see <a href="http://docs111.mootools.net/#window" rel="nofollow noreferrer">documentation</a>)

I want to determine that the browser of the client machines in Opera or not using JavaScript, how to do that?

How to determine the Opera browser using JavaScript

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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我想确定客户端的浏览器是在Opera机上还是不使用JavaScript，该怎么做呢？

问如何使用JavaScript确定Opera浏览器
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