blocks|key|111017|text|它是一个long+and+sad+story。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|111018|总而言之：|111019|111020|Mozilla浏览器发布，带有用户代理Mozilla/1.0+(Win3.1)。它被公开地更名为Netscape，但在它的用户代理中，它保留了它原来的名字。|ordered-list-item|style|CODE|111021|+is发布了。|111022|，Gecko，Konqueror，Opera，Safari和Chrome都决定以类似的方式欺骗以前浏览器的用户代理，以便操纵浏览器嗅探网页，使其正确地理解浏览器的功能。作为这种欺骗的一部分，所有浏览器都以Mozilla/作为它们的用户代理，就像它们之前的浏览器一样。许多其他的无稽之谈也随之而来，比如现代Chrome的用户代理同时声称自己是Mozilla、Chrome、Safari和“像壁虎”。|111023|111024|entityMap|0|LINK|mutability|MUTABLE|url|http://webaim.org/blog/user-agent-string-history/^0|4|I|0|0|0|0|J|K|0|0|2U|8|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|14|8|@$A|15|B|16|J|K]]|9|@]|C|$]]|$1|L|3|M|5|I|7|17|8|@]|9|@]|C|$]]|$1|N|3|O|5|I|7|18|8|@$A|19|B|1A|J|K]]|9|@]|C|$]]|$1|P|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

It is a <a href="http://webaim.org/blog/user-agent-string-history/" rel="noreferrer">long and sad story</a>.

In summary:

<ol>
<li>Mozilla browser gets released, with User-Agent <code>Mozilla/1.0 (Win3.1)</code>. It is publicly renamed to Netscape, but in its User-Agent it keeps its original name .</li>
<li>Internet Explorer is released. It spoofs Netscape by starting its User-Agent with <code>Mozilla/</code> because web servers were routinely browser sniffing and serving pages with frames - a feature supported by both Netscape and IE, but not other browsers of the era - to Netscape only.</li>
<li>Over time, Gecko, Konqueror, Opera, Safari and Chrome each decide to similarly spoof the User-Agent of some previous browser in order to manipulate browser-sniffing web pages into correctly understanding their browser's features. As part of this spoofing, all the browsers start their User-Agents with <code>Mozilla/</code>, like the browsers before them had done. Plenty of other nonsense also results, like modern Chrome's User-Agent simultaneously claiming to be Mozilla, Chrome, Safari, and 'like Gecko'.</li>
</ol>

blocks|key|4313711|text|我认为这与：http://en.wikipedia.org/wiki/User_agent#User_agent_spoofing有关|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4313712|在早期，Netscape+(代号为Mozilla)是IE的主要竞争对手，他们希望防止被拒绝Netscape以外的浏览器的网站拒绝。|4313713|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/User_agent#User_agent_spoofing^0|6|1N|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I think it had to do with: <a href="http://en.wikipedia.org/wiki/User_agent#User_agent_spoofing" rel="noreferrer">http://en.wikipedia.org/wiki/User_agent#User_agent_spoofing</a>

Back in the early days, Netscape (code named Mozilla) was the main rival of IE, and they wanted to prevent being rejected by sites rejecting browsers other than Netscape.

blocks|key|111040|text|正如@Jason提到的，“这是一个很长的故事”。将这个故事总结为“每个浏览器都假装是Mozilla”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|111041|在尝试了所有方法之后，我最终使用了：http://www.useragentstring.com/|offset|length|111042|您可以使用上面的网站获取格式化的用户代理和操作系统。|111043|他们有一个API，你可以直接使用...|111044|entityMap|0|LINK|mutability|MUTABLE|url|http://www.useragentstring.com/|1|http://www.useragentstring.com/?uas=Mozilla/5.0%2520%2528Windows%2520NT%25206.1%2529%2520AppleWebKit/537.36%2520%2528KHTML,%2520like%2520Gecko%2529%2520Chrome/27.0.1453.110%2520Safari/537.36&getJSON=all^0|0|I|V|0|0|0|5|3|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

As mentioned by @Jason "Its a long story". Summing that story up "its just every browser pretends to be Mozilla"

After trying everything, I have finally used: <a href="http://www.useragentstring.com/" rel="noreferrer">http://www.useragentstring.com/</a>

You can use the above website to get the formatted user agent and OS. 
They have an <a href="http://www.useragentstring.com/?uas=Mozilla/5.0%20%28Windows%20NT%206.1%29%20AppleWebKit/537.36%20%28KHTML,%20like%20Gecko%29%20Chrome/27.0.1453.110%20Safari/537.36&amp;getJSON=all" rel="noreferrer">API</a> which you can use directly...

blocks|key|1411212|text|因为这是Netscape自我识别的方式，而微软希望与能够检测到Netscape并拒绝任何其他内容的网站合作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1411213|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Because that's how Netscape identified itself, and Microsoft wanted to work with sites that would detect Netscape and reject anything else.

blocks|key|1097191|text|造成这种情况的原因是臭名昭著的浏览器大战。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1097192|简而言之，浏览器开始伪装成其他浏览器，因为一些网站根据哪种浏览器请求内容来提供内容，而且他们也想要为其他浏览器提供内容。|1097193|我觉得很奇怪，直到今天还没有解决这个问题。由于遗留的原因，userAgent不能被安全地移除，为什么没有引入一些明确识别浏览器的新功能？是的，大多数时候你不需要浏览器检测，而是一个功能检测，但它也不是内置的JS！|CODE|1097194|entityMap^0|F|5|0|0|T|9|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|P|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Q|8|@$9|R|A|S|B|J]]|D|@]|E|$]]|$1|K|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|L|$]]

Reason for this are the infamous browser wars.

In short - browsers started to pretend to be some other browser, because some websites served content based on which browser asked for it and they also wanted content meant for other browsers.

I find it surprising it still haven't been solved to this day. Since <code>userAgent</code> can't be safely removed for legacy reasons, why some new feature clearly identifying a browser wasn't introduced? Yes, most of the time you don't need browser detection, but rather a feature detection, but it is not built-in JS neither!

blocks|key|112098|text|Mozilla/5.0是通用的标记，表示浏览器与Mozilla兼容，并且在当今几乎所有浏览器中都很常见。有关详细信息，请参阅click+here|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|112099|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox^0|1Q|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]]]]

Mozilla/5.0 is the general token that says the browser is Mozilla compatible, and is common to almost every browser today.
for more detail <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox" rel="nofollow noreferrer">click here</a>

All popular browsers' user agent strings, even Internet Explorer's, start with <code>Mozilla/</code>. Why is this the case?

Why do all browsers' user agents start with "Mozilla/"?

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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所有流行浏览器的用户代理字符串，即使是‘s浏览器，都以Mozilla/开头。为什么会这样呢？

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