blocks|key|800272|text|您可以查看此处描述的用户代理string+-+window.navigator.userAgent：https://developer.mozilla.org/en/DOM/window.navigator.userAgent|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|800273|如果您真正想要检测的是您是否有支持特定功能的浏览器版本，那么使用功能检测几乎总是比使用浏览器版本检测更好。modernizr是一个庞大的特征检测代码库，您可以按原样使用，也可以借用其中的一个特定部分，或者只是学习一般技术的工作原理。|800274|当我在Google上搜索时，我看到Android的用户代理字符串如下：|800275|Mozilla/5.0+(Linux;+U;+Android+2.2.1;+fr-ch;+A43+Build/FROYO)+AppleWebKit/533.1+(KHTML,+like+Gecko)+Version/4.0+Mobile+Safari/533.1|code-block|syntax|javascript|800276|在window.navigator.userAgent上运行/Android\s%2B([\d\.]%2B)/的正则表达式将获取安卓版本号。|800277|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/DOM/window.navigator.userAgent^0|N|Q|1E|1R|0|0|0|0|0|1|Q|U|L|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|15|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|16|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

You can look at the user agent string - <code>window.navigator.userAgent</code> described here: <a href="https://developer.mozilla.org/en/DOM/window.navigator.userAgent" rel="noreferrer">https://developer.mozilla.org/en/DOM/window.navigator.userAgent</a>

If what you're really trying to detect is whether you have a version of the browser that supports a particular feature, then it's nearly always better to use feature detection instead of browser version detection. modernizr is a huge base of code for feature detection that you can either use as is or borrow one particular piece from or just learn how the general technique works.

When I Google, I see user agent strings like this for Android:

<pre><code>Mozilla/5.0 (Linux; U; Android 2.2.1; fr-ch; A43 Build/FROYO) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
</code></pre>

A regex of <code>/Android\s+([\d\.]+)/</code> on <code>window.navigator.userAgent</code> will pick up the Android version number.

blocks|key|800288|text|function+getAndroidVersion(ua)+{
++++ua+=+(ua+%7C%7C+navigator.userAgent).toLowerCase();+
++++var+match+=+ua.match(/android\s([0-9\.]*)/i);
++++return+match+?+match[1]+:+undefined;
};

getAndroidVersion();+//"4.2.1"
parseInt(getAndroidVersion(),+10);+//4
parseFloat(getAndroidVersion());+//4.2|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|800289|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function getAndroidVersion(ua) {
 ua = (ua || navigator.userAgent).toLowerCase(); 
 var match = ua.match(/android\s([0-9\.]*)/i);
 return match ? match[1] : undefined;
};

getAndroidVersion(); //"4.2.1"
parseInt(getAndroidVersion(), 10); //4
parseFloat(getAndroidVersion()); //4.2
</code></pre>

blocks|key|800344|text|摩托罗拉的播放器用户代理可以有以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|800345|Linux;Android+;+Release/4.1.2|code-block|syntax|javascript|800346|因此，我不得不开始使用以下正则表达式：|800347|[a%7CA]ndroid[%5E\d]*([\d[_%7C.]]%2B\d)|800348|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Motorola's player user agents can have the following:

<pre><code>Linux;Android ; Release/4.1.2
</code></pre>

So, I've had to start using the the following regex:

<pre><code>[a|A]ndroid[^\d]*([\d[_|.]]+\d)
</code></pre>

blocks|key|800426|text|我不能评论，因为我没有足够的代表...我只想补充一下，我不得不把neiker的代码改成|type|unstyled|depth|inlineStyleRanges|entityRanges|data|800427|var+match+=+ua.match(/Android\s([0-9\.]*)/i);|code-block|syntax|javascript|800428|为了使其不区分大小写，因为Galaxy+S3在其用户代理中返回"+Android“而不是Android。|800429|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I can't comment because I don't have enough rep...
Just wanted to add that I had to change neiker's code to

<pre><code>var match = ua.match(/Android\s([0-9\.]*)/i);
</code></pre>

to make it case insensitive because the Galaxy S3 was returning "android" instead of Android in its user agent

blocks|key|800462|text|这段代码从用户代理检查Android的完整版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|800463|var+test+=+LowerThanAndroidVersion('4.4');
if+(test)+{
++++alert('lower+than+android+4.4')
}+else+if+(test+==+undefined)+{
++++alert('no+android')
}+else+{
++++alert('android+4.4+or+higher');
}++++

function+LowerThanAndroidVersion(testversion)+{
++++//var+useragent+=+'Mozilla/5.0+(Linux;+U;+Android+4.3.1;+en-gb;+GT-I9300+Build/IMM76D)+AppleWebKit/534.30+(KHTML,+like+Gecko)+Version/4.0+Mobile+Safari/534.30';
++++var+useragent+=+navigator.userAgent;
++++var+androidpoint+=+useragent.indexOf('Android');
++++if+(androidpoint+>=+0)+{
++++++++var+rest+=+useragent.substring(androidpoint+%2B+8,+useragent.length);
++++++++var+version+=+rest.substring(0,+rest.indexOf(';'));
++++++++return+(version+<+testversion)+?+true+:+false;
++++}
}|code-block|syntax|javascript|800464|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This code checks the full version of Android from the useragent.

<pre><code>var test = LowerThanAndroidVersion('4.4');
if (test) {
 alert('lower than android 4.4')
} else if (test == undefined) {
 alert('no android')
} else {
 alert('android 4.4 or higher');
} 

function LowerThanAndroidVersion(testversion) {
 //var useragent = 'Mozilla/5.0 (Linux; U; Android 4.3.1; en-gb; GT-I9300 Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30';
 var useragent = navigator.userAgent;
 var androidpoint = useragent.indexOf('Android');
 if (androidpoint &gt;= 0) {
 var rest = useragent.substring(androidpoint + 8, useragent.length);
 var version = rest.substring(0, rest.indexOf(';'));
 return (version &lt; testversion) ? true : false;
 }
}
</code></pre>

blocks|key|800539|text|最好先检查设备是否为android，因为Windows+mobile可以在其用户代理中安装Android。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|800540|示例:+Mozilla/5.0+(Windows+Phone+10.0；Android+4.2.1；；)+AppleWebKit/+(KHTML，如Gecko)+Chrome/+Mobile+Safari/+Edge/。|800541|以下是检查它的方法Detecting+iOS+/+Android+Operating+system|offset|length|800542|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/21741841/detecting-ios-android-operating-system^0|0|0|9|14|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

It's better to check first if device is android or not as Windows mobile can have Android in its user agent. 

Example:
Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; ; ) AppleWebKit/ (KHTML, like Gecko) Chrome/ Mobile Safari/ Edge/.

Here is way to check it
<a href="https://stackoverflow.com/questions/21741841/detecting-ios-android-operating-system">Detecting iOS / Android Operating system</a>

blocks|key|584612|text|我做了这个功能，并在Android+2.6.3，4.2.2，6.0.1的不同浏览器和设备上工作得很好。我认为这可以是另一种选择。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|584613|function+check_android_version()
{
++++var+ua+=+navigator.userAgent;+
++++ua+=+ua.toLowerCase();

++++var+and_pos+=+ua.search("android");
++++if(and_pos+==+-1)
++++++++return+0;+//not+android

++++var+pv_pos+=+ua.indexOf(";",+and_pos);
++++var+versao+=+ua.slice(and_pos%2B8,+pv_pos);

++++return+versao;
}|code-block|syntax|javascript|584614|这很简单，首先，搜索单词"android“。如果未找到，则返回0(不是Android用户代理)。然后搜索"android“位置后面的第一个';‘，它标志着版本的结束。一旦获得了这些位置，'slice‘隔离了版本号(即'%2B8’删除了最终结果中的单词"android“)，然后返回。|584615|如果有人发现任何缺陷，将很高兴分享。|584616|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I made this function and worked very well in Android 2.6.3, 4.2.2., 6.0.1 in different browsers and devices. I think that can be an alternative.

<pre><code>function check_android_version()
{
 var ua = navigator.userAgent; 
 ua = ua.toLowerCase();

 var and_pos = ua.search("android");
 if(and_pos == -1)
 return 0; //not android

 var pv_pos = ua.indexOf(";", and_pos);
 var versao = ua.slice(and_pos+8, pv_pos);

 return versao;
}
</code></pre>

This is quite simple, first, search for the word "android". If not found, returns 0 (is not an Android user agent). Then search for the first ';' after the "android" position that marks the end of the version. Once these positions are gotten, the 'slice' insulates the version numbers (that '+8' removes the word "android" of the final result) an then returns.

If someone find any flaw, would be nice to share.

I'm building a web app and wanting to disable transitions effects on Android devices under version 3.0. 

Is there anyway to pick up the Android version number by Javascript in the browser? If so how?

Pick up the Android version in the browser by Javascript

Android

Windows

Linux

我正在构建一个web应用程序，并希望在3.0版以下的Android设备上禁用过渡效果。有没有办法在浏览器中通过Javascript获取Android版本号？如果是这样的话，是怎么做的？

问通过Javascript在浏览器中获取Android版本
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